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In humans, an example of sex-linked trait is

A. Curly hair

B. Sickle-cell anaemia

C. Colour-blindness

D. Down's syndrome

Correct Answer : C.


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  1.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  2. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  3. The number of characters investigated by Mendel was
  4. Reverse transcription was discovered by
  5. Albinism in com plants is best described as
  6. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  7. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  8. If an individual does not breed true for its characters, it is called
  9. In a monohybrid cross the Fi ratio of a backcross is
  10. The first person to induce mutations was
  11. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  12. The segment of DNA which participates in crossing over is known as
  13.  A chemical mutagen is
  14. DNA duplication occurs in
  15. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  16. Transfer of a gene or genes through a virus is called
  17. Crossing over in meiosis occurs in
  18. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  19. Base substitutions from base analogues I are called
  20. A codon is a sequence of 3 nucleolides on
  21. Mutations which are not dominant are not lost by a gene pooL This is known as
  22. Which disease results from the genetic inability to synthesize a single enzyme ?
  23. Which one of the following chemical characteristics is not common to all living beings ?
  24. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  25. The best method to determine whether an individual is homozygous or heterozygous is
  26. Linked genes may be separated by the process of
  27. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  28. The genetic constitution of an organism is known as
  29. Chromosomes exhibit minimum coiling during
  30. The term 'meiosis' was coined bv