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When is the sex of an offspring decided

A. At ovulation

B. During meiosis

C. During cleavage

D. At fertilization

Correct Answer : D.


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  1. Linkage is
  2. Which one of the following chemical characteristics is not common to all living beings ?
  3. Mutations which are not dominant are not lost by a gene pooL This is known as
  4. The nuclear membrane completely disappears during
  5. Among the following which is a test cross?
  6. When is the sex of an offspring decided
  7. Which disease results from the genetic inability to synthesize a single enzyme ?
  8. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  9.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  10. The chromosomal theroy of heredity implies that
  11. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  12. Klinefelter's syndrome is developed when the chromosome in male is
  13. The number of characters investigated by Mendel was
  14. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  15.  A chemical mutagen is
  16. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  17. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  18. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  19. The science dealing with study of inheritance and variation is
  20. Linked genes may be separated by the process of
  21. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  22. Diakinesis is characterised by
  23. In a monohybrid cross the Fi ratio of a backcross is
  24. The best method to determine whether an individual is homozygous or heterozygous is
  25. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  26. Exhibition of superiority by a hybrid over both of its parents is called
  27. Base substitutions from base analogues I are called
  28. If an individual does not breed true for its characters, it is called
  29. The segment of DNA which participates in crossing over is known as
  30. The genetic constitution of an organism is known as