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प्रश्न
Explain why generally only the male child suffers from colour blindness and not the female?
उत्तर
Colourblindness is caused by recessive genes which occur on the X chromosome.
Males have only one X chromosome. If there is a recessive gene present on the X chromosome, then the male will suffer from colour blindness.
Females have two X-chromosomes. It is highly unlikely that both X chromosomes carry abnormal genes. As a result, if one gene is abnormal and recessive, the normal gene present on the other X chromosome will mask its expression. Females are unlikely to suffer from colourblindness.
The following cases explain the sex-linked inheritance of colour blindness.
Case 1
Case 2
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संबंधित प्रश्न
Give scientific reasons : Colour blindness is more common in men than in women.
Name the Following
The type of gene which is not expressed in the presence of a contrasting allele.
A haemophilic man marries a carrier women. Find out the probability of their offsprings being haemophilic.
Why are sex linked recessive characters more common in the male human beings?
Inheritance of hypertrichosis occurs directly from ____________.
Teena's father bas haemophilia which is an X-linked recessive trait, but her husband has normal blood clotting. What is the chance her son will have the disease?
Which of the following is also known as Bleeder's disease?
Give examples of X-linked traits.
A plant with red flowers was crossed with another plant with yellow flowers. If F1 showed all flowers orange in colour, explain the inheritance.
Four friends P, Q, R and S were discussing the examples of genetic disorders. The examples they quoted were as follows:
P. Colour blindness and Malaria
Q. Albinism and Cholera
R. Haemophilia and Colour blindness
S. Haemophilia and Albinism
Who gave the correct examples?
