Down's syndrome is an example of

A. monosomy

B. trisomy

C. triploidy

D. polyploidy

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  1. Which disease results from the genetic inability to synthesize a single enzyme ?
  2.  A chemical mutagen is
  3. Colour blindness is caused due to
  4. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  5. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  6. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  7. When two genes are situated very close to each other in a chromosome
  8. Chromosomes exhibit minimum coiling during
  9. If an individual does not breed true for its characters, it is called
  10. The chromosomal theroy of heredity implies that
  11. Base substitutions from base analogues I are called
  12. Mutations which are not dominant are not lost by a gene pooL This is known as
  13. The scientists who rediscovered the Mendel's laws are
  14. A codon is a sequence of 3 nucleolides on
  15. Exhibition of superiority by a hybrid over both of its parents is called
  16. Lethal genes are those which
  17. The best method to determine whether an individual is homozygous or heterozygous is
  18. The term 'meiosis' was coined bv
  19. DNA duplication occurs in
  20. Linked genes may be separated by the process of
  21. The first person to induce mutations was
  22. Albinism in com plants is best described as
  23. Crossing over in meiosis occurs in
  24. Among the following which is a test cross?
  25. The genetic constitution of an organism is known as
  26. When is the sex of an offspring decided
  27. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  28. The nuclear membrane completely disappears during
  29. Reverse transcription was discovered by
  30. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by