Person whose father is colourblind marries a lady whose mother is daughter of a colourblind man. The

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4.Principles of Inheritance and Variation

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Person whose father is colourblind marries a lady whose mother is daughter of a colourblind man. Their children will be

All normal

All colour blind

All sons colour blind

Some sons normal and some colour blind

Solution

(d) A person whose father is colourblind i.e. person is normal because colour blind genes located on $x$-chromosome of father and it is transfered into only its daughters.

This person marry with a lady whose mother is daughter of colour blind father i.e. lady is carrier for colour blind.

Thus normal man marries with a carrier lady and their sons will be some normal and some colour blind.

Standard 12

Biology

In a sickle cell anaemia glutamic acid is replaced by valine, which the following codes for glutamic acid ?

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

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(NEET-2014)

A normal visioned woman, whose father is colour blind, marries a normal visioned man. What would be probability of her sons and daughters to be colour blind ? Explain with the help of a pedigree chart.

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If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

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(NEET-2013)

Haemolytic jaundice is caused due to a dominant gene but only $10\%$ of the people actually develop the disease. A heterozygous man marries a homozygous normal woman; what proportion of the children would be expected to develop the haemolytic disease

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(AIIMS-1982)

Person whose father is colourblind marries a lady whose mother is daughter of a colourblind man. Their children will be

Solution

Similar Questions

In a sickle cell anaemia glutamic acid is replaced by valine, which the following codes for glutamic acid ?

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

A normal visioned woman, whose father is colour blind, marries a normal visioned man. What would be probability of her sons and daughters to be colour blind ? Explain with the help of a pedigree chart.

If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

Haemolytic jaundice is caused due to a dominant gene but only $10\%$ of the people actually develop the disease. A heterozygous man marries a homozygous normal woman; what proportion of the children would be expected to develop the haemolytic disease

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