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Down's syndrome is an example of

A. monosomy

B. trisomy

C. triploidy

D. polyploidy

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  1. Crossing over in meiosis occurs in
  2. The science dealing with study of inheritance and variation is
  3. If an individual does not breed true for its characters, it is called
  4. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  5. DNA duplication occurs in
  6. Chromosomes exhibit minimum coiling during
  7.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  8. In humans, an example of sex-linked trait is
  9. A codon is a sequence of 3 nucleolides on
  10. The first person to induce mutations was
  11. The segment of DNA which participates in crossing over is known as
  12. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  13. Reverse transcription was discovered by
  14. Diakinesis is characterised by
  15. The nuclear membrane completely disappears during
  16. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  17. The term 'meiosis' was coined bv
  18. In a monohybrid cross the Fi ratio of a backcross is
  19. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  20. Base substitutions from base analogues I are called
  21. Which disease results from the genetic inability to synthesize a single enzyme ?
  22. The chromosomal theroy of heredity implies that
  23. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  24. When two genes are situated very close to each other in a chromosome
  25. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  26. Klinefelter's syndrome is developed when the chromosome in male is
  27.  A chemical mutagen is
  28. Among the following which is a test cross?
  29. The scientists who rediscovered the Mendel's laws are
  30. Exhibition of superiority by a hybrid over both of its parents is called