A woman with two genes (one on each X-chromosome) for haemophilia and one gene for colour blindness on the X-chromosome marries a normal man. How will the progeny be?

All sons and daughters are haemophilic and colourblind

Haemophilic and colourblind daughters

50% haemophilic colourblind sons and 50% haemophilic sons

50% haemophilic daughters and 50% colourblind daughters

Solution

50% haemophilic colourblind sons and 50% haemophilic sons

Haemophilia and colour blindness both are recessive X-linked traits. They express in males when present in single copy (heterozygous) but in females, they express only when present in homozygous condition.

Some More Questions From Principles of Inheritance and Variation Chapter

What is Mendel’s monohybrid phenotypic ratio ?

Write down Mendel’s dihybrid Phenotypic ratio

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Principles Of Inheritance And Variation

Some More Questions From Principles of Inheritance and Variation Chapter

What is Mendel’s monohybrid phenotypic ratio ?

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 ?

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