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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. Klinefelter's syndrome is developed when the chromosome in male is
  2. Linked genes may be separated by the process of
  3. Lethal genes are those which
  4. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  5. When is the sex of an offspring decided
  6. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  7. Which disease results from the genetic inability to synthesize a single enzyme ?
  8. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  9. Down's syndrome is an example of
  10. Mutations which are not dominant are not lost by a gene pooL This is known as
  11. The science dealing with study of inheritance and variation is
  12. Linkage is
  13. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  14. The first person to induce mutations was
  15. Dyad is
  16. In a monohybrid cross the Fi ratio of a backcross is
  17. The scientists who rediscovered the Mendel's laws are
  18. Colour blindness is caused due to
  19. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  20. How many meiosis will be required to produce 102 pollen-grains ?
  21. The genetic constitution of an organism is known as
  22. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  23.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  24. The best method to determine whether an individual is homozygous or heterozygous is
  25. Reverse transcription was discovered by
  26. Albinism in com plants is best described as
  27. Among the following which is a test cross?
  28. The number of characters investigated by Mendel was
  29. When two genes are situated very close to each other in a chromosome
  30. Which one of the following chemical characteristics is not common to all living beings ?