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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. The segment of DNA which participates in crossing over is known as
  2. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  3. When is the sex of an offspring decided
  4. The condition in which only one allele of a pair is present is known as
  5. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  6. Reverse transcription was discovered by
  7. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  8. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  9.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  10. Mutations which are not dominant are not lost by a gene pooL This is known as
  11. The number of characters investigated by Mendel was
  12. Base substitutions from base analogues I are called
  13. Klinefelter's syndrome is developed when the chromosome in male is
  14. Crossing over in meiosis occurs in
  15. Transfer of a gene or genes through a virus is called
  16. Colour blindness is caused due to
  17. Among the following which is a test cross?
  18. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  19. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  20. Diakinesis is characterised by
  21. If an individual does not breed true for its characters, it is called
  22. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  23. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  24. In a monohybrid cross the Fi ratio of a backcross is
  25. Dyad is
  26. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  27. The nuclear membrane completely disappears during
  28.  A chemical mutagen is
  29. Which one of the following chemical characteristics is not common to all living beings ?
  30. The best method to determine whether an individual is homozygous or heterozygous is