Question
Which among the following statements is/are correct with respect to the law of dominance?
A. Each character is controlled by pair of discrete units called factors.
B. In a dissimilar pair of factors one is dominant and the other is recessive.
C. It explains the expression of one trait in F1 and both traits in F2 generation.
D. Explains the proportion of phenotypes, 3:1 obtained in F2 generation.
A. Each character is controlled by pair of discrete units called factors.
B. In a dissimilar pair of factors one is dominant and the other is recessive.
C. It explains the expression of one trait in F1 and both traits in F2 generation.
D. Explains the proportion of phenotypes, 3:1 obtained in F2 generation.
Answer: Option D
:
D
Law of dominance explains that out of the two factors determining a character, one is dominant- this is the one that gets expressed inheterozygous condition. Thus the dominant character appears in F1 generation when the progenies are heterozygous. The law of dominance also explains the reappearance of the recessive factor in theF2 generation, when the recessive factors re-unite in a homozygous condition. Thus, it also explains the proportion of 3:1 obtainedin the F2 generation.
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:
D
Law of dominance explains that out of the two factors determining a character, one is dominant- this is the one that gets expressed inheterozygous condition. Thus the dominant character appears in F1 generation when the progenies are heterozygous. The law of dominance also explains the reappearance of the recessive factor in theF2 generation, when the recessive factors re-unite in a homozygous condition. Thus, it also explains the proportion of 3:1 obtainedin the F2 generation.
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