In humans, an example of sex-linked trait is

A. Curly hair

B. Sickle-cell anaemia

C. Colour-blindness

D. Down's syndrome

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