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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. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  2. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  3. In humans, an example of sex-linked trait is
  4. When two genes are situated very close to each other in a chromosome
  5. Transfer of a gene or genes through a virus is called
  6. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  7. A codon is a sequence of 3 nucleolides on
  8. Lethal genes are those which
  9. The scientists who rediscovered the Mendel's laws are
  10. Which disease results from the genetic inability to synthesize a single enzyme ?
  11. The science dealing with study of inheritance and variation is
  12. The chromosomal theroy of heredity implies that
  13. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  14. Among the following which is a test cross?
  15. Mutations which are not dominant are not lost by a gene pooL This is known as
  16. Base substitutions from base analogues I are called
  17. Chromosomes exhibit minimum coiling during
  18. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  19. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  20. Klinefelter's syndrome is developed when the chromosome in male is
  21. The segment of DNA which participates in crossing over is known as
  22. In a monohybrid cross the Fi ratio of a backcross is
  23. How many meiosis will be required to produce 102 pollen-grains ?
  24. If an individual does not breed true for its characters, it is called
  25. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  26. The best method to determine whether an individual is homozygous or heterozygous is
  27.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  28. Dyad is
  29. Colour blindness is caused due to
  30. Diakinesis is characterised by