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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. The number of characters investigated by Mendel was
  2. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  3. Albinism in com plants is best described as
  4. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  5. Which one of the following chemical characteristics is not common to all living beings ?
  6. The scientists who rediscovered the Mendel's laws are
  7. Chromosomes exhibit minimum coiling during
  8. Transfer of a gene or genes through a virus is called
  9. Reverse transcription was discovered by
  10. The condition in which only one allele of a pair is present is known as
  11. The best method to determine whether an individual is homozygous or heterozygous is
  12.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  13. Dyad is
  14. Lethal genes are those which
  15. In humans, an example of sex-linked trait is
  16. Mutations which are not dominant are not lost by a gene pooL This is known as
  17. Linked genes may be separated by the process of
  18. In a monohybrid cross the Fi ratio of a backcross is
  19. If an individual does not breed true for its characters, it is called
  20. The segment of DNA which participates in crossing over is known as
  21. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  22. Linkage is
  23. The term 'meiosis' was coined bv
  24. The first person to induce mutations was
  25. Diakinesis is characterised by
  26. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  27. The genetic constitution of an organism is known as
  28. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  29. How many meiosis will be required to produce 102 pollen-grains ?
  30. Klinefelter's syndrome is developed when the chromosome in male is