Lethal genes are those which

A. cause the death of the organism in which they are present

B. cause the death of the homozygous infant being formed

C. cause the death of heterozygous infant being formed

D. all of the above

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  1. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  2. Linkage is
  3. Reverse transcription was discovered by
  4. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  5. A codon is a sequence of 3 nucleolides on
  6. The best method to determine whether an individual is homozygous or heterozygous is
  7. The genetic constitution of an organism is known as
  8. In a monohybrid cross the Fi ratio of a backcross is
  9. DNA duplication occurs in
  10. Dyad is
  11. The chromosomal theroy of heredity implies that
  12. When two genes are situated very close to each other in a chromosome
  13. Linked genes may be separated by the process of
  14.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  15. Crossing over in meiosis occurs in
  16. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  17. Chromosomes exhibit minimum coiling during
  18. The scientists who rediscovered the Mendel's laws are
  19. When is the sex of an offspring decided
  20. Exhibition of superiority by a hybrid over both of its parents is called
  21. The number of characters investigated by Mendel was
  22. Which one of the following chemical characteristics is not common to all living beings ?
  23. Diakinesis is characterised by
  24. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  25. The nuclear membrane completely disappears during
  26. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  27. Which disease results from the genetic inability to synthesize a single enzyme ?
  28. Down's syndrome is an example of
  29.  A chemical mutagen is
  30. Among the following which is a test cross?