A man whose father was colour blind marries a woman, who had a colourblind mother and normal father. What percentage of male children of this couple will be colourblind.

25%

0%

50%

75%

Solution

50%

As colour blindness is an autosomal recessive genetic disorder, for it is present at X -chromosome. Thus, according to the situation given in the question, a man whose father was colour blind (will be, i.e, XY normal) marries a woman whose mother was colour blind and father was normal (i.e, this woman will be a carrier) according to the cross given below.

Thus, when marriage will happen between a normal man and a carrier woman, in that case, percentage of a male child to be colour blind is 25% (this can be easily observed from the cross given below)

Some More Questions From Principles of Inheritance and Variation Chapter

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Principles Of Inheritance And Variation

A man whose father was colour blind marries a woman, who had a colourblind mother and normal father. What percentage of male children of this couple will be colourblind.

25%

0%

50%

75%

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What do the symbols square and circle in a pedigree chart indicate ?

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Why is male Drosophila regarded as heterogametic ?

What term is used for the two chromatids resulting from the interchange of segments during crossing over ?

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Principles Of Inheritance And Variation

A man whose father was colour blind marries a woman, who had a colourblind mother and normal father. What percentage of male children of this couple will be colourblind. 25% 0% 50% 75%

Some More Questions From Principles of Inheritance and Variation Chapter

Write down Mendel’s dihybrid Phenotypic ratio

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

What is the unique feature of F1 generation ?

What will be the genetic make up of an organism which suffers from sickle cell anaemia ?

What do the symbols square and circle in a pedigree chart indicate ?

Define heterogamy. Give an example.

How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

What term is used for the two chromatids resulting from the interchange of segments during crossing over ?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

A man whose father was colour blind marries a woman, who had a colourblind mother and normal father. What percentage of male children of this couple will be colourblind.

25%

0%

50%

75%