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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. Reverse transcription was discovered by
  2. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  3. The first person to induce mutations was
  4. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  5. The best method to determine whether an individual is homozygous or heterozygous is
  6. DNA duplication occurs in
  7. When two genes are situated very close to each other in a chromosome
  8. Crossing over in meiosis occurs in
  9. Which disease results from the genetic inability to synthesize a single enzyme ?
  10. The segment of DNA which participates in crossing over is known as
  11.  A chemical mutagen is
  12. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  13. Which one of the following chemical characteristics is not common to all living beings ?
  14. Colour blindness is caused due to
  15. The number of characters investigated by Mendel was
  16. The term 'meiosis' was coined bv
  17. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  18. In a monohybrid cross the Fi ratio of a backcross is
  19. Diakinesis is characterised by
  20. The condition in which only one allele of a pair is present is known as
  21. Down's syndrome is an example of
  22. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  23. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  24. How many meiosis will be required to produce 102 pollen-grains ?
  25. Albinism in com plants is best described as
  26. Exhibition of superiority by a hybrid over both of its parents is called
  27.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  28. When is the sex of an offspring decided
  29. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  30. Dyad is