Down's syndrome is an example of

A. monosomy

B. trisomy

C. triploidy

D. polyploidy

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  1. How many meiosis will be required to produce 102 pollen-grains ?
  2. The scientists who rediscovered the Mendel's laws are
  3. Klinefelter's syndrome is developed when the chromosome in male is
  4. Diakinesis is characterised by
  5. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  6. Exhibition of superiority by a hybrid over both of its parents is called
  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. Which one of the following chemical characteristics is not common to all living beings ?
  10. The genetic constitution of an organism is known as
  11. A codon is a sequence of 3 nucleolides on
  12. If an individual does not breed true for its characters, it is called
  13. Among the following which is a test cross?
  14. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  15. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  16. The first person to induce mutations was
  17. The condition in which only one allele of a pair is present is known as
  18. Base substitutions from base analogues I are called
  19. In a monohybrid cross the Fi ratio of a backcross is
  20. Crossing over in meiosis occurs in
  21. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  22. The science dealing with study of inheritance and variation is
  23. Transfer of a gene or genes through a virus is called
  24. Down's syndrome is an example of
  25. The segment of DNA which participates in crossing over is known as
  26. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  27. Reverse transcription was discovered by
  28. The chromosomal theroy of heredity implies that
  29. DNA duplication occurs in
  30.  A chemical mutagen is