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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. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  2. Diakinesis is characterised by
  3. The chromosomal theroy of heredity implies that
  4. A codon is a sequence of 3 nucleolides on
  5. Linkage is
  6. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  7. Among the following which is a test cross?
  8.  A chemical mutagen is
  9. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  10. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  11. Transfer of a gene or genes through a virus is called
  12. Which disease results from the genetic inability to synthesize a single enzyme ?
  13. Albinism in com plants is best described as
  14. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  15. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  16. Reverse transcription was discovered by
  17. The segment of DNA which participates in crossing over is known as
  18.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  19. Linked genes may be separated by the process of
  20. Chromosomes exhibit minimum coiling during
  21. Which one of the following chemical characteristics is not common to all living beings ?
  22. The number of characters investigated by Mendel was
  23. In a monohybrid cross the Fi ratio of a backcross is
  24. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  25. Down's syndrome is an example of
  26. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  27. Crossing over in meiosis occurs in
  28. The scientists who rediscovered the Mendel's laws are
  29. The science dealing with study of inheritance and variation is
  30. Base substitutions from base analogues I are called