Name: Haemophilia: The Royal Disease
Uploaded: 2019-07-19
Duration: 2 min 3 s
Description: Haemophilia is an inherited genetic disorder that impairs the body's ability to make blood clots, a process needed to stop bleeding. Know more about it.

Question

Think of a possibility of a marriage between carrier woman (XX^o ) and a colour blind man (X^oY). Is there a possibility of the birth of a colour blind daughter? Work out the progeny in the following Punnett square.

Accepted Answer

The colour blindness is the inability in seeing colours distinctly. The colour perception in humans is governed by an interaction of X-linked genes and autosomal genes. The female serves as a carrier of red-green colour blindness. This can be explained by the following cross:

The above cross showing a cross between a carrier female and a normal male.

X = Normal chromosome

X^o = Colourblind chromosome

The female consists of XX chromosomes and the male consists of XY chromosomes. The female serves as a carrier if one out of two X chromosomes is affected, and becomes colour blind if both the X chromosomes are affected, whereas the male consists of XY pair of chromosomes, therefore, become affected if the X chromosome is affected with colour blindness. It can be concluded that there is only 25 % probability of colourblindness daughter.

H S Vishnoi Solutions for Exercise 2: Exercise 2

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