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More men suffer from colour blindess tha...

More men suffer from colour blindess than women because

A

Women are more resistant to disease than men

B

The male sex hormone testosterone causes the disease

C

The colour blind gene is carried on the 'Y' chromosome

D

Men are hemizygous and one defective gene is enough to make them colour blind

Text Solution

Verified by Experts

The correct Answer is:
D
Because colour blindness is a recessive sex-linked disease, genes of the which are parent exclusively on non-homologous segment of X chromosomes, so males need only one affected chromosomes ti express the character whereas females need both the affected chromosomes to exhibit the same.
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ERRORLESS -PRINCIPLES OF INHERITANCE AND VARIATION-Principles Of Inheritance And Variation
  1. A colour blind man marries the daughter of a colour blind person. Then...

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  2. Given is : X is the chromosome with gene for haemophilia and X is the ...

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  3. More men suffer from colour blindess than women because

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  4. Sex-linked characters are

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  5. This pedigree is of a rare trait, in which children have extra fingers...

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  6. If mother is a carrier for colour blindess and father is normal, then ...

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  7. Study the pedigree chart given below What does its show

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  8. A man a inherit his X chromosome from

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  9. In a pedigree analysis, square=0 respresents

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  10. Select the incorrect statement from the following

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  11. In the above given pedigree, assume that no outsider marrying in, carr...

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  12. Which one of the following is a genetically transmitted character

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  13. A normal-visioned man whose father was colour-blind, marries a woman w...

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  14. A man who is suffering from a recessive X linked disease marries a nor...

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  15. Person whose father is colourblind marries a lady whose mother is daug...

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  16. Which one of the following symbols and its representation, used in hum...

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  17. Pick out the correct statements (A) Haemophilia is a sex-linked rece...

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  18. The most common type of haemophilia results from the congenital absenc...

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  19. Which of the following diseases belongs to the same category as colour...

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  20. X-linked recessive gene is

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