NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1
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 ?


- AHaemophilia
- BSickel cell anaemia
- CThalassemia
- DPhenylketonuria
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Correct answer: A
The inheritance pattern of a particular trait shown in the picture results in haemophilia. Haemophilia is a group of inherited blood disorders in which the blood does not clot properly. It is caused by a fault in one of the genes that determine how the body makes blood clotting factor VIII or IX. These genes are located on the X chromosome.
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