When two genes are situated very close to each other in a chromosome

A. the percentage of crossing over between themis high

B. hardly any cross-overs detected

C. no crossing-over can ever take place between them

D. only double cross overs can take place between them.

You can do it
  1. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  2. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  3. Base substitutions from base analogues I are called
  4. Klinefelter's syndrome is developed when the chromosome in male is
  5. The number of characters investigated by Mendel was
  6. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  7. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  8.  A chemical mutagen is
  9. The best method to determine whether an individual is homozygous or heterozygous is
  10. Diakinesis is characterised by
  11. When is the sex of an offspring decided
  12. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  13. Transfer of a gene or genes through a virus is called
  14. Linked genes may be separated by the process of
  15. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  16. Which disease results from the genetic inability to synthesize a single enzyme ?
  17. How many meiosis will be required to produce 102 pollen-grains ?
  18. Dyad is
  19. In a monohybrid cross the Fi ratio of a backcross is
  20. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  21. Reverse transcription was discovered by
  22. In humans, an example of sex-linked trait is
  23. DNA duplication occurs in
  24.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  25. Chromosomes exhibit minimum coiling during
  26. The genetic constitution of an organism is known as
  27. Among the following which is a test cross?
  28. Down's syndrome is an example of
  29. If an individual does not breed true for its characters, it is called
  30. The first person to induce mutations was