Which one of the following can be explained on the basis of Mendel's Law of Dominance? Choose the correct answer from the options given below:
- A, B and C only
- A, C, D and E only
- B, C and D only
- A, B, C, D and E
Answer
(2) A, C, D and E only
Solution
The Law of Dominance states: (i) characters are controlled by discrete units called factors (D); (ii) factors occur in pairs (C); (iii) in a dissimilar pair of factors one member dominates (dominant) and the other does not (recessive) (A).
It explains the expression of only one of the parental characters in a monohybrid cross (E).
B is wrong: the reappearance of both characters in the F2 generation is explained by the Law of Segregation, not by dominance.
Hence A, C, D and E are correct.
Answer: (2)