An offspring of two homozygous parents different from one another by alleles at only one gene locus is known as

A. monohybrid

B. dihybrid

C. trihybrid

D. backcross

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  1. The nuclear membrane completely disappears during
  2. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  3. The condition in which only one allele of a pair is present is known as
  4. A codon is a sequence of 3 nucleolides on
  5. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  6. The genetic constitution of an organism is known as
  7. Among the following which is a test cross?
  8. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  9. Dyad is
  10. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  11. The number of characters investigated by Mendel was
  12. Which one of the following chemical characteristics is not common to all living beings ?
  13. Which disease results from the genetic inability to synthesize a single enzyme ?
  14. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  15. Down's syndrome is an example of
  16. Linked genes may be separated by the process of
  17. The chromosomal theroy of heredity implies that
  18. The scientists who rediscovered the Mendel's laws are
  19. Crossing over in meiosis occurs in
  20.  A chemical mutagen is
  21. The segment of DNA which participates in crossing over is known as
  22. In a monohybrid cross the Fi ratio of a backcross is
  23. If an individual does not breed true for its characters, it is called
  24. In humans, an example of sex-linked trait is
  25. How many meiosis will be required to produce 102 pollen-grains ?
  26. Mutations which are not dominant are not lost by a gene pooL This is known as
  27. Exhibition of superiority by a hybrid over both of its parents is called
  28.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  29. Chromosomes exhibit minimum coiling during
  30. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of