Which one of the following cannot be explained on the basis of Mendel's law of dominance?
Correct answer: C. Alleles do not show any blending and both the characters recover as such in the F2 generation
- A. The discrete unit controlling a particular character is called a factor
- B. Out of one pair of factors, one is dominant, and the other is recessive
- C. Alleles do not show any blending and both the characters recover as such in the F2 generation
- D. Factors occur in pairs
Explanation
Option C is the correct choice because it describes a phenomenon explained by Mendel's law of independent assortment, not the law of dominance. In the context of the law of dominance, one allele masks the effect of another in a heterozygous pair, whereas the statement in Option C refers to the independent segregation of alleles leading to the reappearance of both parental traits in the F2 generation. Options A, B, and D all align with Mendel's law of dominance, which involves the expression of dominant and recessive alleles, and the occurrence of alleles in pairs.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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