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In the Operon concept, the regulator gene regulates chemical reactions in the cell by

A. inhibiting transcription of m-RNA

B. inactivating enzymes in the reaction

C. inhibiting the substrate in the reaction

D. inhibiting the migration of m-RNA into cytoplasm

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  1. Mutations which are not dominant are not lost by a gene pooL This is known as
  2. The scientists who rediscovered the Mendel's laws are
  3. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  4. Reverse transcription was discovered by
  5.  A chemical mutagen is
  6. Diakinesis is characterised by
  7. The first person to induce mutations was
  8. In humans, an example of sex-linked trait is
  9. DNA duplication occurs in
  10. How many meiosis will be required to produce 102 pollen-grains ?
  11. When two genes are situated very close to each other in a chromosome
  12. In a monohybrid cross the Fi ratio of a backcross is
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  14. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  15. Down's syndrome is an example of
  16. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  17. The segment of DNA which participates in crossing over is known as
  18. Chromosomes exhibit minimum coiling during
  19. The nuclear membrane completely disappears during
  20. A codon is a sequence of 3 nucleolides on
  21. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  22. The term 'meiosis' was coined bv
  23. The genetic constitution of an organism is known as
  24. When is the sex of an offspring decided
  25. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  26. Exhibition of superiority by a hybrid over both of its parents is called
  27. Dyad is
  28. The best method to determine whether an individual is homozygous or heterozygous is
  29. Linkage is
  30. Albinism in com plants is best described as