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A woman with normal vision, but whose f...

A woman with normal vision, but whose father was colour blind, marries a colourblind man. Suppose that the fourth child of this couple was a boy. This boy :

A

Must have normal colour vision

B

May be colour blind or may be normal vision

C

Will be partially colour blind since he is heterozygous for the colour blind mutant allele

D

Must be colour blind

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The correct Answer is:
B
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ALLEN-GENETICS & MOLECULAR BASIS OF INHERITANCE AND MUTATION-EXERCISE-I (CONCEPTUAL QUESTIONS)
  1. The longer the chromosome of an organism, the more genetic variability...

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  2. Which statement is incorrect about linkage-

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  3. A woman with normal vision, but whose father was colour blind, marrie...

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  4. Haemophilia is more commonly seen in human males than in human females...

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  5. Had Mendel decided to study those traits together which are determined...

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  6. Mendel formulated the laws of heredity considering seven pairs of cons...

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  7. If Mendel had studied the seven traits using a plant with 12 chromosom...

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  8. Linkage in plants was first shown in

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  9. With increasing age the linkage becomes :-

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  10. Coupling and repulsion theory of linkage was given by

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  11. If there were only parental combinations in F(2) of a dihybrid cross t...

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  12. Linkage was discovered by

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  13. A dihybrid plant with incomplete linkage on test corss may produce how...

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  14. How many linkage group are there in bacteria E. coli :-

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  15. If distance between gene on chromosome is more, then gene shows :-

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  16. Linked gene shows :-

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  17. The number of linkage groups in a cell having 10 pairs of chromosomes ...

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  18. Association of parental combination of characters in offspring in exce...

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  19. Complete linkage is found in

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  20. A phenomenon which works opposite to the linkage is

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