Principles of Inheritance and Variation

158 questions · Biology · NEET

Principles of Inheritance and Variation

158 questions · Biology · NEET

What is the pattern of inheritance for polygenic trait?2025 · Q28 · MCQ
With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in $F_{3}$ generation. Includes diagram2025 · Q65 · MCQ
Genes $R$ and $Y$ follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F2 generation?2025 · Q85 · MCQ
Which one of the following can be explained on the basis of Mendel's Law of Dominance? A. Out of one pair of factors one is dominant and the other is recessive. B. Alleles do not show any expression and both the characters appear as such…2024 · Q23 · MCQ
A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?2024 · Q31 · MCQ
In a plant, black seed color $(BB / Bb)$ is dominant over white seed color $(bb)$ . In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?2024 · Q33 · MCQ
Match List I with List II Choose the correct answer from the options given below: Includes table2024 · Q35 · MCQ
As per ABO blood grouping system, the blood group of father is $B^{+}$ , mother is $A^{+}$ and child is $O^{+}$ . Their respective genotype can be A. IBi/IAi/ii B. IBIB/IAIA/ii C. iIB/iIA/IAIB D. IAi/IBi/IAi E.…2024 · Q97 · MCQ
Given below are two statements: Statement I: When many alleles of a single gene govern a character, it is called polygenic inheritance. Statement II: In Polygenic inheritance, the effect of each allele is additive. In the light of the…2024 · Q4 · MCQ
When a tall pea plant with round seeds was selfed, it produced the progeny of : (a) Tall plants with round seeds and (b) Tall plants with wrinkled seeds. Identify the genotype of the parent plant.2024 · Q48 · MCQ
Match List-I with List-II: Choose the correct answer from the options given below: Includes table2024 · Q7 · MCQ
Aneuploidy is a chromosomal disorder where chromosome number is not the exact copy of its haploid set of chromosomes, due to : A. Substitution B. Addition C. Deletion D. Translocation E. Inversion Choose the most appropriate answer from…2024 · Q87 · MCQ
The mother has $A +$ blood group the father has $B +$ and the child is $A +$ . What can be the possibility of genotypes of all three, respectively? A. $I^{A} I^{A} ∣ I B i ∣ I^{B} i$ B. $I^{A} I^{A} I^{B} i I^{A} i$ C. $I^{B} i I^{A} I^{A} I^{A} I^{B}$ …2024 · Q95 · MCQ
A heterozygous pea plant with violet flowers was crossed with homozygous pea plant with white flower. Violet is dominant over white. Which one of the following represents the expected combinations among 40 progenies formed?2023 · Q24 · MCQ
In which disorder change of single base pair in the gene for beta globin chain results in change of glutamic acid to valine ?2023 · Q29 · MCQ
A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The F1 plants had yellow seeds and pink flowers. The F1 plants were selfed to get F2 progeny. Assuming…2023 · Q40 · MCQ
Match List - I with List - II. Choose the correct answer from the options given below : Includes table2023 · Q5 · MCQ
Select the correct statement/s with respect to mechanism of sex determination in Grasshopper. (A) It is an example of female heterogamety. (B) Male produces two different types of gametes either with or without X chromosome. (C) Total…2023 · Q87 · MCQ
The phenomenon of pleiotropism refers to2023 · Q20 · MCQ
Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by2023 · Q3 · MCQ
Which of the following statements are correct about Klinefelter’s Syndrome? A. This disorder was first described by Langdon Down (1866). B. Such an individual has overall masculine development. However, the feminine development is also…2023 · Q32 · MCQ
Broad palm with single palm crease is visible in a person suffering from-2023 · Q49 · MCQ
Which one of the following symbols represents mating between relatives in human pedigree analysis?2023 · Q58 · MCQ
Given below are two statements: Statement I : Sickle cell anaemia and haemophilia are autosomal dominant traits. Statement II : Sickle cell anaemia and haemophilia are disorders of the blood. In the light of the above statements, choose…2022 · Q1 · MCQ
The chromosomal theory of inheritance was proposed by2022 · Q15 · MCQ
What is the expected percentage of F2 progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloured, inflated pod and yellow coloured constricted pod?2022 · Q37 · MCQ
If a female individual is with small round head, furrowed tongue, partially open mouth and broad palm with characteristic palm crease. Also the physical, psychomotor and mental development is retarded. The karyotype analysis of such an…2022 · Q39 · MCQ
Select the incorrect match regarding the symbols used in the Pedigree analysis:2022 · Q58 · MCQ
In meiosis, crossing over and exchange of genetic material between homologous chromosomes are catalyzed by the enzyme2022 · Q7 · MCQ
A normal girl, whose mother is haemophilic marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of the offspring? (a) Haemophilic son and haemophilic daughter. (b) Haemophilic son and carrier…2022 · Q86 · MCQ
XO type of sex determination can be found in :2022 · Q16 · MCQ
Given below are two statements: Statement I : Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance. Statement II : Seven characters examined by Mendel in his experiment on pea plants were seed…2022 · Q31 · MCQ
Which of the following occurs due to the presence of autosome linked dominant trait?2022 · Q37 · MCQ
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Mendel's law of independent assortment does not hold good for the genes that are located closely on the same…2022 · Q43 · MCQ
If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness?2022 · Q75 · MCQ
The recombination frequency between the genes a & c 5&, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 25% and a & d is 29%. What will be the sequence of these genes on a linear chromosome?2022 · Q81 · MCQ
The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram called :2021 · Q4 · MCQ
Now-a-days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complimentary DNA in a clone of cells, followed by its detection using autoradiography because:2021 · Q40 · MCQ
In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?2021 · Q55 · MCQ
Experimental verification of the chromosomal theory of inheritance was done by2020 · Q45 · MCQ
Select the correct match2020 · Q47 · MCQ
How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?2020 · Q77 · MCQ
The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by :2019 · Q13 · MCQ
What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile?2019 · Q2 · MCQ
What map unit (Centimorgan) is adopted in the construction of genetic maps?2019 · Q3 · MCQ
A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?2019 · Q4 · MCQ
In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers. Choose the incorrect statement…2019 · Q42 · MCQ
Select the incorrect statement.2019 · Q5 · MCQ
Which of the following pairs is wrongly matched?2018 · Q60 · MCQ
Which of the following characteristics represent 'Inheritance of blood groups' in humans? a. Dominance b. Co-dominance c. Multiple allele d. Incomplete dominance e. Polygenic inheritance2018 · Q69 · MCQ
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by2018 · Q72 · MCQ
Among the following characters, which one was not considered by Mendel in his experiments on pea?2017 · Q63 · MCQ
Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.2017 · Q69 · MCQ
The genotypes of a Husband and Wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?2017 · Q70 · MCQ
A disease caused by an autosomal primary non-disjunction is :2017 · Q71 · MCQ
Which one from those given below is the period for Mendel’s hybridisation experiments ?2017 · Q72 · MCQ
In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-typeoffspring. This indicates2016 · Q68 · MCQ
Match the terms in Column-I with their description in Column-II and choose the correct option : Includes table2016 · Q69 · MCQ
A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is contaning more…2016 · Q70 · MCQ
Pick out the correct statements : (a) Haemophilia is a sex-linked recessive disease. (b) Down's syndrome is due to aneuploidy. (c) Phenylketonuria is an autosomal recessive gene disorder. (d) Sickle cell anaemia is an X – linked recessive…2016 · Q71 · MCQ
Which of the following most appropriately describes haemophilia ?2016 · Q72 · MCQ
A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of -2016 · Q73 · MCQ
The mechanism that causes a gene to move from one linkage group to another is called2016 · Q65 · MCQ
If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is2016 · Q66 · MCQ
The movement of a gene from one linkage group to another is called2015 · Q50 · MCQ
Alleles are2015 · Q51 · MCQ
A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offsprings?2015 · Q52 · MCQ
How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?2015 · Q53 · MCQ
Multiple alleles are present2015 · Q54 · MCQ
An abnormal human baby with ‘XXX’ sex chromosomes was born due to2015 · Q55 · MCQ
Which one is the incorrect statement with regards to the importance of pedigree analysis?2013 · Q17 · MCQ
Down's syndrome in humans is due to :2013 · Q18 · MCQ
Select the incorrect statement with regard to Haemophilia is :2013 · Q34 · MCQ
Which idea is depicted by a cross in which the F1 generation resembles both the parents?2013 · Q64 · MCQ
If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group : 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein…2013 · Q65 · MCQ
Which of the following cannot be detected in a developing foetus by amniocentesis ?2013 · Q66 · MCQ
If both parents are carriers for thalessemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child ?2013 · Q67 · MCQ
Which one of the following is a wrong statement regarding mutations ?2012 · Q28 · MCQ
Represented below is the inheritance pattern of the certain type of traits in humans. Which one of the following conditions could be an example of this pattern ? Includes diagram2012 · Q4 · MCQ
A test cross is carried out to :2012 · Q5 · MCQ
A normal - visioned man whose father was colour bilind, marries a woman whose father was also colour - blind. They have their first child as a daughter. What are the chances that this child would be colour blind2012 · Q23 · MCQ
F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents a case of2012 · Q37 · MCQ
Test cross in plants or in Drosophila involves crossing :2011 · Q5 · MCQ
Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child ?2011 · Q6 · MCQ
Mutations can be induced with :2011 · Q59 · MCQ
When two unrelated individuals or lines are crossed, the per romance of F1 hybrid is often superior to both parents. This phenomenon is called :2011 · Q65 · MCQ
Which one of the following conditions correctly describes the manner of determining the sex ?2011 · Q66 · MCQ
Study the pedigree chart of a certain family given below and select the correct conculusion which can be drawn for the character – Includes diagram2010 · Q13 · MCQ
ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible -2010 · Q2 · MCQ
In antirrhinum two plants with pink flowers were hybridized. The F1 plants produced red, pink and white flowers in the proportion of 1 red, 2 pink and 1 white. What could be the genotype of the two plants used for hybridization ? Red…2010 · Q48 · MCQ
A cross in which an organism showing a dominant phenotype in crossed with the recessive parent in order to know its genotype is called -2010 · Q49 · MCQ
Which one of the following symbols and its representation, used in human pedigree analysis is correct –2010 · Q74 · MCQ
ABO blood groups in humans are controlled by the gene I. It has three alleles – IA, IB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur –2010 · Q75 · MCQ
The genotype of a plant showing the dominant phenotype can be determined by –2010 · Q76 · MCQ
Select the correct statement from the ones given below with respect to dihybrid cross –2010 · Q77 · MCQ
Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?2010 · Q78 · MCQ
Select the incorrect statement from the following :2009 · Q67 · MCQ
Sickle-cell anemia is :2009 · Q68 · MCQ
The genetic defect-adenosine deaminase (ADA) deficiency may be cured permanently by2009 · Q69 · MCQ
The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because "O" in it refers to having :2009 · Q70 · MCQ
Study the pedigree chart given below : What does it show ? Includes diagram2009 · Q71 · MCQ
Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?2008 · Q69 · MCQ
Haploids are more suitable for mutation studies than the diploids. This is because:2008 · Q79 · MCQ
A human male produces sperms with the genotypes AB, Ab, AB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person ?2007 · Q56 · MCQ
In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation ?2007 · Q57 · MCQ
Inheritance of skin colour in humans is an example of:-2007 · Q58 · MCQ
A common test to find the genotype of a hybrid is by:-2007 · Q59 · MCQ
In the hexaploid wheat, the haploid(n) and basic(x) numbers of chromosomes are :2007 · Q60 · MCQ
Both sickle cell anemia and Huntington's chorea are-2006 · Q63 · MCQ
Test cross involves-2006 · Q64 · MCQ
If a colour blind woman marries a normal visioned man, their sons will be2006 · Q65 · MCQ
Sickle cell anaemia has not been eliminated from the African population because-2006 · Q66 · MCQ
In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY ×…2006 · Q67 · MCQ
Cri-du-chat syndrome in humans is caused by the-2006 · Q68 · MCQ
How many different kinds of gametes will be produced by a plant having the genotype AABbCC ?2006 · Q69 · MCQ
Which one of the following is an example of polygenic inheritance ?2006 · Q70 · MCQ
Phenotype of an organism is the result of-2006 · Q71 · MCQ
In order to find out the different types of gametes produced by a pea plants having the genotype AaBb, it should be crossed to a plant with the genotype -2005 · Q19 · MCQ
G-6-P dehydrogenase deficiency is associated with haemolysis of -2005 · Q20 · MCQ
A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughter and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the…2005 · Q33 · MCQ
A women with 47 chromosomes due to three copies of chromosome 21 is characterized by2005 · Q61 · MCQ
A women with 47 chromosomes due to three copies of chromosome 21 is characterized by -2005 · Q63 · MCQ
Haemophilia is more commonly seen in human males than in human females because -2005 · Q64 · MCQ
A woman with normal vision, but whose father was colour bind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy -2005 · Q65 · MCQ
Which of the following is not a hereditary disease ?2005 · Q66 · MCQ
In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt2004 · Q59 · MCQ
Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to :-2004 · Q60 · MCQ
A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperms will be abh :-2004 · Q61 · MCQ
One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in -2004 · Q62 · MCQ
A normal woman, whose father was colour-blind is married to a normal man. The sons would be :-2004 · Q63 · MCQ
The recessive genes located on X-chromosomes in humans are always-2004 · Q64 · MCQ
Which one of the following traits of garden pea studied by Mendel was a recessive feature ?2003 · Q67 · MCQ
The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes ?2003 · Q68 · MCQ
Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross, is known as : -2003 · Q69 · MCQ
Pattern baldness, moustaches and beard in human males are examples of : -2003 · Q70 · MCQ
In Drosophila, the sex is determined by : -2003 · Q71 · MCQ
Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder ?2003 · Q72 · MCQ
Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infectious disease ?2003 · Q73 · MCQ
Which of the following is the example of pleiotropy ?2002 · Q34 · MCQ
There are three genes a, b and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome2002 · Q65 · MCQ
On selfing a plant of F1 generation with genotype “AABbCC”,the genotypic ratio in F2 generation will be2002 · Q66 · MCQ
A diseased man marries a normal woman. They get three daughter and five sons. All the daughter were diseased and sons were normal. The gene of this disease is : -2002 · Q67 · MCQ
A gene said to be dominant if : -2002 · Q68 · MCQ
Which of the following is a correct match -2002 · Q69 · MCQ
Two nonallelic genes produces the new phenotype when present together but fail to do so independently then it is called : -2001 · Q27 · MCQ
Ratio of complementry genes is : -2001 · Q58 · MCQ
When dominant and recessive allels express itself together it is called : -2001 · Q59 · MCQ
A and B genes are linked. What shall be genotype of progeny in a cross between AB/ab and ab/ab : -2001 · Q60 · MCQ
Independent assortment of genes does not takes place when : -2001 · Q61 · MCQ
Number of Barr bodies in XXXX female is2001 · Q62 · MCQ
Sickle cell anaemia is induce to : -2001 · Q63 · MCQ
Male XX and female XY sometime occur due to2001 · Q64 · MCQ
Probability of four son to a couple is : -2001 · Q65 · MCQ
In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klienfelter's syndrome in male. It proves :2000 · Q59 · MCQ
According to mendelism which character is showing dominance ?2000 · Q67 · MCQ
Due to the cross between TTRr × ttrr the resultant progenies showed how many percent plants tall, red flowered :2000 · Q68 · MCQ
Mongolian idiots are due to trisomy in 21st chromosome is called :2000 · Q69 · MCQ
Erythroblastosis foetalis is caused when :2000 · Q70 · MCQ