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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

Correct Answer : D.


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  2. The term 'meiosis' was coined bv
  3. Lethal genes are those which
  4. The nuclear membrane completely disappears during
  5. Base substitutions from base analogues I are called
  6. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  7.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
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  10. In humans, an example of sex-linked trait is
  11. Linkage is
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  13. The chromosomal theroy of heredity implies that
  14. Chromosomes exhibit minimum coiling during
  15.  A chemical mutagen is
  16. DNA duplication occurs in
  17. Colour blindness is caused due to
  18. Which one of the following chemical characteristics is not common to all living beings ?
  19. When is the sex of an offspring decided
  20. The genetic constitution of an organism is known as
  21. The segment of DNA which participates in crossing over is known as
  22. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  23. A codon is a sequence of 3 nucleolides on
  24. Which disease results from the genetic inability to synthesize a single enzyme ?
  25. Mutations which are not dominant are not lost by a gene pooL This is known as
  26. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  27. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  28. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  29. How many meiosis will be required to produce 102 pollen-grains ?
  30. A giant chromosome having many chromo-nemata lying side by side all along their length is called