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When is the sex of an offspring decided

A. At ovulation

B. During meiosis

C. During cleavage

D. At fertilization

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  1. The science dealing with study of inheritance and variation is
  2. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  3. Transfer of a gene or genes through a virus is called
  4. How many meiosis will be required to produce 102 pollen-grains ?
  5. Chromosomes exhibit minimum coiling during
  6.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  7. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  8. Dyad is
  9. Down's syndrome is an example of
  10. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  11. The term 'meiosis' was coined bv
  12. Lethal genes are those which
  13. The segment of DNA which participates in crossing over is known as
  14. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  15. In a monohybrid cross the Fi ratio of a backcross is
  16. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  17. Crossing over in meiosis occurs in
  18. When two genes are situated very close to each other in a chromosome
  19. Linkage is
  20. A codon is a sequence of 3 nucleolides on
  21. Colour blindness is caused due to
  22. If an individual does not breed true for its characters, it is called
  23. Which disease results from the genetic inability to synthesize a single enzyme ?
  24. The first person to induce mutations was
  25. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  26. Among the following which is a test cross?
  27. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  28. Mutations which are not dominant are not lost by a gene pooL This is known as
  29. Base substitutions from base analogues I are called
  30. When is the sex of an offspring decided