AP BIOLOGY

Detailed explanation-1: -In snapdragon, crossing pure red (RR) and pure white (rr) flowered plants produces pink (Rr) flowered plants. In this case the dominant allele ‘R’ is not completely dominant over the recessive allele ‘r’. This phenomenon is called incomplete dominance.

Detailed explanation-2: -When a red-flowered plant is crossed with a white-flowered plant, the F1 generation has pink flowers.

Detailed explanation-3: -Figure 21: A cross between a red and white snapdragon will yield 100% pink offspring. This pattern of inheritance is described as incomplete dominance, meaning that neither of the alleles is completely dominant over the other: both alleles can be seen at the same time.

Detailed explanation-4: -In snapdragon i.e. Antirrhinum majus, the flower color is controlled by incomplete dominance. The snapdragon flower has two flower colours, red (RR) and white (rr). When cross-pollination occurs between red and white flowers, a pink (Rr) snapdragon flower is produced.

Detailed explanation-5: -Example of incomplete dominance:-Cross pollination between red snapdragon and white snapdragon result in pink snapdragon. Here, neither the white allele or red allele is dominant.-The pink colour results from the blending of both the two alleles that are white allele or white and red allele.