Question

which is an example of incomplete dominance? pea plant height. color blindness. a human with ab blood type. red and white snapdragon flowers producing pink flowers.

Explanation:

1. Analyze "Pea plant height": Pea plant height (tall/short) shows complete dominance, where one allele is fully dominant over the other. So this is not incomplete dominance.
2. Analyze "Color blindness": Color blindness is an X - linked recessive trait, not related to incomplete dominance.
3. Analyze "A human with AB blood type": AB blood type in humans is an example of codominance, where both A and B alleles are fully expressed, not incomplete dominance.
4. Analyze "Red and white snapdragon flowers producing pink flowers": In incomplete dominance, the heterozygous phenotype is an intermediate (blend) of the two homozygous phenotypes. Red (RR) and white (rr) snapdragon flowers producing pink (Rr) flowers is a classic example of incomplete dominance, as the heterozygote shows a phenotype that is a blend of the two homozygous phenotypes.

Answer:

D. Red and white snapdragon flowers producing pink flowers.