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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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  1. The term 'meiosis' was coined bv
  2. The nuclear membrane completely disappears during
  3. The segment of DNA which participates in crossing over is known as
  4. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  5. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  6. Linkage is
  7. A codon is a sequence of 3 nucleolides on
  8. Linked genes may be separated by the process of
  9. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  10. Which one of the following chemical characteristics is not common to all living beings ?
  11. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  12. In humans, an example of sex-linked trait is
  13. In a monohybrid cross the Fi ratio of a backcross is
  14. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  15. Dyad is
  16. If an individual does not breed true for its characters, it is called
  17. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  18. Albinism in com plants is best described as
  19. DNA duplication occurs in
  20. The number of characters investigated by Mendel was
  21. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  22. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  23.  A chemical mutagen is
  24. Klinefelter's syndrome is developed when the chromosome in male is
  25. Mutations which are not dominant are not lost by a gene pooL This is known as
  26. Base substitutions from base analogues I are called
  27. The first person to induce mutations was
  28. The scientists who rediscovered the Mendel's laws are
  29. Which disease results from the genetic inability to synthesize a single enzyme ?
  30. A colour-blind man marries the daughter of a colour-blind person. In their progeny