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Dyad is

A. a pair of homologous chromosomes

B. a pair of non-homologous chromosomes

C. a pair of sister chromosomes

D. a pair of non-sister chromosomes

Correct Answer : C.


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  1. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  2.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  3. The genetic constitution of an organism is known as
  4. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  5. Which one of the following chemical characteristics is not common to all living beings ?
  6. Crossing over in meiosis occurs in
  7. Dyad is
  8. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  9. In a monohybrid cross the Fi ratio of a backcross is
  10. The best method to determine whether an individual is homozygous or heterozygous is
  11. The condition in which only one allele of a pair is present is known as
  12. The number of characters investigated by Mendel was
  13. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  14. Albinism in com plants is best described as
  15. Chromosomes exhibit minimum coiling during
  16. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  17. Base substitutions from base analogues I are called
  18. Exhibition of superiority by a hybrid over both of its parents is called
  19. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  20. Mutations which are not dominant are not lost by a gene pooL This is known as
  21. Reverse transcription was discovered by
  22. The nuclear membrane completely disappears during
  23. Which disease results from the genetic inability to synthesize a single enzyme ?
  24. DNA duplication occurs in
  25. When two genes are situated very close to each other in a chromosome
  26. Transfer of a gene or genes through a virus is called
  27. How many meiosis will be required to produce 102 pollen-grains ?
  28. The segment of DNA which participates in crossing over is known as
  29. The science dealing with study of inheritance and variation is
  30. A child is bom with an extra chromosome in each of its cells. This is usually the result of