Incomplete dominance, in which the heterozygote appears to be intermediate between the two homozygotes.
{"Image DocumentName": "Incomplete dominance, in which the heterozygote appears to be intermediate between the two homozygotes.", "Image ImageDescription": "Incomplete dominance is when the heterozygote appears to be intermediate between the two homozygotes. Flower color of snapdragons follows this pattern (Figure 7-17 Pink snapdragons demonstrate incomplete dominance). True-breeding lines of red flowers are crossed with true-breeding lines that produce only white flowers. We would expect all red or all white flowers if one allele were dominant over the other. Instead, such crosses always produce plants with pink flowers. Interestingly, when we cross two plants with pink flowers, we get 1/4 red-flowered plants, 1/2 pink-flowered plants, and 1/4 white-flowered plants. The white flowers have the genotype CWCW and produce no pigment. The red flowers have the genotype CRCR and produce a great deal of pigment. The letter C refers to the fact that the gene codes for color and the superscript W or R refers to an allele producing no-pigment or red-pigment. The pink flowers receive only one of the pigment producing CR alleles and one of the no-pigment CW alleles and so produce an intermediate amount of pigment. Ultimately, the intensity of pigmentation just depends on the amount of the pigmentation chemical made by the color gene. 27.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}