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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

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  1. Among the following which is a test cross?
  2. When two genes are situated very close to each other in a chromosome
  3. The number of characters investigated by Mendel was
  4. When is the sex of an offspring decided
  5. The scientists who rediscovered the Mendel's laws are
  6. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  7. How many meiosis will be required to produce 102 pollen-grains ?
  8.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  9. Base substitutions from base analogues I are called
  10. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  11. The best method to determine whether an individual is homozygous or heterozygous is
  12. Transfer of a gene or genes through a virus is called
  13. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  14. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  15. The nuclear membrane completely disappears during
  16. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  17. Dyad is
  18. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  19. Exhibition of superiority by a hybrid over both of its parents is called
  20. Which disease results from the genetic inability to synthesize a single enzyme ?
  21. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  22. DNA duplication occurs in
  23. Klinefelter's syndrome is developed when the chromosome in male is
  24. Albinism in com plants is best described as
  25. Lethal genes are those which
  26. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  27. Down's syndrome is an example of
  28. Crossing over in meiosis occurs in
  29. Which one of the following chemical characteristics is not common to all living beings ?
  30. A codon is a sequence of 3 nucleolides on