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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

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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. Dyad is
  3. The first person to induce mutations was
  4. The number of characters investigated by Mendel was
  5. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  6. Exhibition of superiority by a hybrid over both of its parents is called
  7. Crossing over in meiosis occurs in
  8. DNA duplication occurs in
  9. Mutations which are not dominant are not lost by a gene pooL This is known as
  10. Diakinesis is characterised by
  11. The segment of DNA which participates in crossing over is known as
  12.  A chemical mutagen is
  13. How many meiosis will be required to produce 102 pollen-grains ?
  14. Down's syndrome is an example of
  15. Reverse transcription was discovered by
  16. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  17. Klinefelter's syndrome is developed when the chromosome in male is
  18. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  19. The nuclear membrane completely disappears during
  20. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  21. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  22. The term 'meiosis' was coined bv
  23. Linkage is
  24. If an individual does not breed true for its characters, it is called
  25. Which disease results from the genetic inability to synthesize a single enzyme ?
  26. Among the following which is a test cross?
  27. Colour blindness is caused due to
  28. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  29. The science dealing with study of inheritance and variation is
  30. The genetic constitution of an organism is known as