MCQ
The monohybrid genotypic ratio is:
- A1 : 1
- B3 : 1
- C1 : 2 : 1
- D9 : 3 : 3 : 1
✓
Answer
- 1 : 2 : 1
Explanation:
Monohybrid cross refers to inheritance of single contrasting trait by two parents at a time. For example, a cross of tall (T) and dwarf (t) pea plants is a monohybrid cross (TT x tt). A monohybrid cross between two pure breeding varieties obtains all dominant F1 generation which in turn produces F2 generation upon selfing and gives the monohybrid phenotypic ratio of 3 (dominant):1 (recessive). The monohybrid genotypic ratio is 1 homozygous tall: 2 heterozygous tall: 1 homozygous dwarf. The monohybrid F1 produces two types of gametes and random fusion of these gametes produces total 4 combinations; 16 combinations are produced in a dihybrid ratio.
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