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Incomplete (partial or mosaic) dominance is the phenomenon where none of the two contrasting alleles or factors is dominant. The expression of the character in a hybrid or F1 individual is intermediate or a fine mixture of the expression of the two factors (as found in homozygous state). Incomplete or mosaic inheritance is not an example of pre-Mendelian concept of blending inheritance because the parental types reappear in the F2 generation. It is however, considered by some workers to be an example of quantitative inheritance where only a single gene pair is involved. F2 phenotypic ratio is 1 : 2 : 1, similar to genotypic ratio.

1. Incomplete dominance is the phenomenon where none of the two contrasting alleles is dominant.
2. The expression of the character in a hybrid or F1 individual is intermediate.
3. F2 phenotypic ratio is 1 : 2 : 1, similar to genotypic ratio.
4. Incomplete dominance is an example of pre-Mendelian blending inheritance.

Correct answer: Incomplete dominance is an example of pre-Mendelian blending inheritance.

Solution

The statement is wrong because incomplete dominance does not produce permanent blending of traits; the parental phenotypes reappear in the F2 generation. That is exactly why it is not considered pre-Mendelian blending inheritance.

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