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Principles Of Inheritance And Variation

Question
CBSEENBI12047079
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One of the genes present exclusively on the X-chromosome in humans is concerned with

  • baldness

  • red-green colour blindness

  • facial hair/moustaches in males

  • night blindness

Solution

B.

red-green colour blindness

The most common form of red-green colour blindness is an 'X chromosome linked recessive' disorder. The 'red' and 'green' genes are known to reside at the tip of the long arm of the X chromosome. Women have two copies of the X-chromosome, and so they may have normal colour vision, even if they carry one copy of the defective gene. Men have only one X-chromosome, and so will be colour blind.

Some More Questions From Principles of Inheritance and Variation Chapter

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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 ?

What is name of a cross in which a dominant individual is crossed with a recessive parent?

Distinguish between homogametic and heterogametic organisms.

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