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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

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  1. The first person to induce mutations was
  2. The term 'meiosis' was coined bv
  3. The science dealing with study of inheritance and variation is
  4. Dyad is
  5. Diakinesis is characterised by
  6. Crossing over in meiosis occurs in
  7. Down's syndrome is an example of
  8. The condition in which only one allele of a pair is present is known as
  9. Which one of the following chemical characteristics is not common to all living beings ?
  10. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  11. Base substitutions from base analogues I are called
  12. The chromosomal theroy of heredity implies that
  13. Chromosomes exhibit minimum coiling during
  14. The segment of DNA which participates in crossing over is known as
  15. Colour blindness is caused due to
  16. How many meiosis will be required to produce 102 pollen-grains ?
  17. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  18. Among the following which is a test cross?
  19. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  20.  A chemical mutagen is
  21. In humans, an example of sex-linked trait is
  22. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  23. Which disease results from the genetic inability to synthesize a single enzyme ?
  24. Linkage is
  25. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  26. If an individual does not breed true for its characters, it is called
  27. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  28. The best method to determine whether an individual is homozygous or heterozygous is
  29. In a monohybrid cross the Fi ratio of a backcross is
  30. The scientists who rediscovered the Mendel's laws are