Which one of the following cannot be explained on the basis of Mendel'...
Mendel's Law of Dominance states that in a pair of alleles, one may mask the expression of the other. The third option (C) cannot be explained by this law because the Law of Dominance does not address the concept of blending or recovery of both characters in the F2 generation. Instead, it focuses on how dominant traits mask recessive traits, and the characters appear as distinct and separate in the F2 generation.
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Which one of the following cannot be explained on the basis of Mendel'...
Understanding Mendel's Law of Dominance
Mendel's Law of Dominance is a fundamental principle of genetics that explains how traits are inherited through generations. However, certain aspects of inheritance cannot be fully explained by this law.
Why Option C is Correct
Option C states: "Alleles do not show any blendings and both the characters recover as such in the F2 generation." This statement suggests that traits remain distinct without any blending in the F1 generation, which is not entirely accurate.
Key Points Regarding Option C
- Incomplete Dominance: In some cases, alleles can exhibit incomplete dominance, where the phenotype of heterozygotes is an intermediate blend of the two parental traits. This means that traits can blend rather than remain distinct.
- Co-Dominance: In co-dominance, both alleles express themselves fully and simultaneously in the phenotype of the heterozygote (e.g., AB blood type). This contradicts the idea that characters remain separate without blending.
- F1 Generation Observations: In the F1 generation, when a dominant allele is present, it typically expresses itself, while the recessive trait is masked. However, the recessive trait can reappear in the F2 generation when two heterozygous individuals are crossed.
Conclusion
Mendel's Law of Dominance primarily addresses the concept of dominant and recessive traits, but it does not account for blending inheritance or the behavior of alleles in cases of incomplete dominance or co-dominance. Therefore, option C cannot be explained solely based on this law.
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