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A colour-blind man marries the daughter of a colour-blind person. In their progeny

A. none of her daughters are colour-blind

B. all her sons are colour-blind

C. all her daughters are colour-blind

D. half of her sons are colour-blind

Correct Answer : D.


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  1. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  2. Chromosomes exhibit minimum coiling during
  3. The genetic constitution of an organism is known as
  4. The segment of DNA which participates in crossing over is known as
  5. The condition in which only one allele of a pair is present is known as
  6. If an individual does not breed true for its characters, it is called
  7. The scientists who rediscovered the Mendel's laws are
  8. Base substitutions from base analogues I are called
  9. In humans, an example of sex-linked trait is
  10. Linked genes may be separated by the process of
  11. Which disease results from the genetic inability to synthesize a single enzyme ?
  12. The best method to determine whether an individual is homozygous or heterozygous is
  13. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  14. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  15.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  16. When is the sex of an offspring decided
  17. Lethal genes are those which
  18. Klinefelter's syndrome is developed when the chromosome in male is
  19. Exhibition of superiority by a hybrid over both of its parents is called
  20. The chromosomal theroy of heredity implies that
  21. Reverse transcription was discovered by
  22. In a monohybrid cross the Fi ratio of a backcross is
  23. Which one of the following chemical characteristics is not common to all living beings ?
  24. Linkage is
  25. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  26. How many meiosis will be required to produce 102 pollen-grains ?
  27. A codon is a sequence of 3 nucleolides on
  28. Colour blindness is caused due to
  29. Mutations which are not dominant are not lost by a gene pooL This is known as
  30. Down's syndrome is an example of