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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 possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  2. Base substitutions from base analogues I are called
  3. The nuclear membrane completely disappears during
  4. A codon is a sequence of 3 nucleolides on
  5. Diakinesis is characterised by
  6. If an individual does not breed true for its characters, it is called
  7.  A chemical mutagen is
  8. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  9. The segment of DNA which participates in crossing over is known as
  10. Klinefelter's syndrome is developed when the chromosome in male is
  11. The number of characters investigated by Mendel was
  12. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  13. DNA duplication occurs in
  14. The best method to determine whether an individual is homozygous or heterozygous is
  15. Which disease results from the genetic inability to synthesize a single enzyme ?
  16. The term 'meiosis' was coined bv
  17. In a monohybrid cross the Fi ratio of a backcross is
  18. When is the sex of an offspring decided
  19. Chromosomes exhibit minimum coiling during
  20. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  21. The condition in which only one allele of a pair is present is known as
  22. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  23. In humans, an example of sex-linked trait is
  24. Mutations which are not dominant are not lost by a gene pooL This is known as
  25. The science dealing with study of inheritance and variation is
  26. Exhibition of superiority by a hybrid over both of its parents is called
  27. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  28. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  29. The chromosomal theroy of heredity implies that
  30. Albinism in com plants is best described as