Question

Match the items in Column I with those in Column II and select the correctly matched option from those given below: 

• A. 1-(ii), 2-(iv), 3-(1), 4-(iii)
• B. 1-(iii), 2-(i), 3-(iv), 4-(ii)
• C. 1-(iii), 2-(iv), 3-(1), 4-(ii)
• D. 1-(ii), 2-(1), 3-(iv), 4-(iii)

Hint:

Mendel’s laws of inheritance form the foundation of genetic ratios. Incomplete dominance results in a 1:2:1 ratio, while test crosses give a 1:1 ratio.

Answer 1

The Correct Option is C

Mendelian monohybrid cross (1): This cross results in a phenotypic ratio of 3:1 in the F2 generation.
- Mendelian dihybrid cross (2): The phenotypic ratio in the F2 generation is 9:3:3:1.
- Incomplete dominance (3): In this case, the phenotypic ratio is 1:2:1 because of the blending of traits in the heterozygote.
- Test cross (4): A test cross between a heterozygous and a homozygous recessive plant results in a phenotypic ratio of 1:1 in the F2 generation.