AP BIOLOGY

Detailed explanation-1: -A pink flower is a heterozygote and carries one of each allele (red and white). The genotype of this flower can be denoted as RW.

Detailed explanation-2: -The crossing of a red flowered plant and a white flowered plant produces all the offspring with pink flowers. This cross illustrates red and white exhibit incomplete dominance. This situation occurs due to the blending of both the alleles.

Detailed explanation-3: -In four o clock plants, the gene for red flower colour (R) is incompletely dominant over the gene for white flower colour (r), hence the plants heterozygous for flower colour (Rr) have pink flowers.

Detailed explanation-4: -In certain flowers, color is inherited by alleles that show incomplete dominance. In such flowers, a cross between a homozygous red flower (RR) and a homozygous white flower (WW) always results in a heterozygous pink flower (WR).