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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. Base substitutions from base analogues I are called
  2. Colour blindness is caused due to
  3. Transfer of a gene or genes through a virus is called
  4. Which one of the following chemical characteristics is not common to all living beings ?
  5. Albinism in com plants is best described as
  6. The nuclear membrane completely disappears during
  7. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  8. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  9. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  10. The scientists who rediscovered the Mendel's laws are
  11. Among the following which is a test cross?
  12.  A chemical mutagen is
  13. In a monohybrid cross the Fi ratio of a backcross is
  14. Exhibition of superiority by a hybrid over both of its parents is called
  15. The science dealing with study of inheritance and variation is
  16. Crossing over in meiosis occurs in
  17. The number of characters investigated by Mendel was
  18. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  19. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  20. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  21. Reverse transcription was discovered by
  22. If an individual does not breed true for its characters, it is called
  23. Mutations which are not dominant are not lost by a gene pooL This is known as
  24. The genetic constitution of an organism is known as
  25. The condition in which only one allele of a pair is present is known as
  26. The first person to induce mutations was
  27. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  28. When two genes are situated very close to each other in a chromosome
  29. The segment of DNA which participates in crossing over is known as
  30.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…