Crossing over in meiosis occurs in

A. leptotene

B. pachytene

C. diplotene

D. diakinesis

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  1. Reverse transcription was discovered by
  2. The science dealing with study of inheritance and variation is
  3. Mutations which are not dominant are not lost by a gene pooL This is known as
  4. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  5. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  6. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  7. Crossing over in meiosis occurs in
  8. Base substitutions from base analogues I are called
  9. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  10. A codon is a sequence of 3 nucleolides on
  11. Transfer of a gene or genes through a virus is called
  12. In a monohybrid cross the Fi ratio of a backcross is
  13. How many meiosis will be required to produce 102 pollen-grains ?
  14. The condition in which only one allele of a pair is present is known as
  15. Down's syndrome is an example of
  16. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  17. The chromosomal theroy of heredity implies that
  18. Dyad is
  19. Linked genes may be separated by the process of
  20. Chromosomes exhibit minimum coiling during
  21.  A chemical mutagen is
  22. Lethal genes are those which
  23. When is the sex of an offspring decided
  24. Exhibition of superiority by a hybrid over both of its parents is called
  25. The scientists who rediscovered the Mendel's laws are
  26. The number of characters investigated by Mendel was
  27. Colour blindness is caused due to
  28. The nuclear membrane completely disappears during
  29. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  30. A colour-blind man marries the daughter of a colour-blind person. In their progeny