A child is bom with an extra chromosome in each of its cells. This is usually the result of

A. nondisjunction

B. crossing over

C. segregation

D. hybridization

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  1. When is the sex of an offspring decided
  2. The chromosomal theroy of heredity implies that
  3. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  4. Among the following which is a test cross?
  5. Which disease results from the genetic inability to synthesize a single enzyme ?
  6. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  7. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  8. Down's syndrome is an example of
  9. Crossing over in meiosis occurs in
  10. Chromosomes exhibit minimum coiling during
  11. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  12. The science dealing with study of inheritance and variation is
  13. Lethal genes are those which
  14. Diakinesis is characterised by
  15. Transfer of a gene or genes through a virus is called
  16. In a monohybrid cross the Fi ratio of a backcross is
  17. Base substitutions from base analogues I are called
  18. The best method to determine whether an individual is homozygous or heterozygous is
  19. The genetic constitution of an organism is known as
  20. Dyad is
  21. Mutations which are not dominant are not lost by a gene pooL This is known as
  22. Klinefelter's syndrome is developed when the chromosome in male is
  23. If an individual does not breed true for its characters, it is called
  24. Albinism in com plants is best described as
  25. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  26. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  27. How many meiosis will be required to produce 102 pollen-grains ?
  28. The number of characters investigated by Mendel was
  29. A codon is a sequence of 3 nucleolides on
  30. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of