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In a monohybrid cross the Fi ratio of a backcross is

A. 1:1

B. 3:1

C. 1:2:1

D. 9:3:3:3

Correct Answer : A.


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  1. Base substitutions from base analogues I are called
  2. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  3. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  4. If an individual does not breed true for its characters, it is called
  5. Crossing over in meiosis occurs in
  6. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  7. The scientists who rediscovered the Mendel's laws are
  8. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  9. The term 'meiosis' was coined bv
  10. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  11. The first person to induce mutations was
  12. Linked genes may be separated by the process of
  13. The number of characters investigated by Mendel was
  14. Mutations which are not dominant are not lost by a gene pooL This is known as
  15. When two genes are situated very close to each other in a chromosome
  16. In humans, an example of sex-linked trait is
  17. In a monohybrid cross the Fi ratio of a backcross is
  18. Reverse transcription was discovered by
  19. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  20. Which one of the following chemical characteristics is not common to all living beings ?
  21. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  22. When is the sex of an offspring decided
  23. Klinefelter's syndrome is developed when the chromosome in male is
  24. The chromosomal theroy of heredity implies that
  25. Transfer of a gene or genes through a virus is called
  26.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  27. The genetic constitution of an organism is known as
  28. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  29. Diakinesis is characterised by
  30. Among the following which is a test cross?