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Principles of Inheritance and Variation question

2023 · Q87
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Principles of Inheritance and Variation question

2023 · Q87

NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1

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 number of chromosomes (autosomes and sex chromosomes) is same in both males and females.

(D) All eggs bear an additional X chromosome besides the autosomes.

Choose the correct answer from the options given below :

  1. A
    (B) and (D) only
  2. B
    (A), (C) and (D) only
  3. C
    (A) only
  4. D
    (A) and (C) only
View written solutionFree

Correct answer: A

In the case of the grasshopper, which has an XO/XX system :

(A) It is not an example of female heterogamety. It is an example of male heterogamety because males have two different types of gametes (XO and OO), while females have only one type (XX).

(B) This statement is correct. Males produce two different types of gametes, either with (X) or without (O) an X chromosome.

(C) This statement is incorrect because the total number of chromosomes is not the same in both males and females. Females have XX, and males have XO.

(D) This statement is correct. All eggs bear an additional X chromosome besides the autosomes.

Therefore, the correct answer is Option A : (B) and (D) only.

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