Question

In plants known as "four o’clocks", the allele for the dominant red-flower color is incompletely dominant over the allele for white-flowers. a gardener allows several heterozygous pink-flowered four o’clocks to self pollinate and collects 200 seeds. draw a punnett square for the cross. identify the flower color phenotypes and theoretical percentage.

Answer 1

In a cross of heterozygous pink-flowered four o'clock plants, with alleles for red and white flower color showing incomplete dominance, the phenotypes and theoretical percentage of red, pink, and white flowered plants would be 25%, 50%, and 25%, respectively.

Step-by-step explanation:

When self-pollinating heterozygous pink-flowered four o'clocks, which exhibit incomplete dominance, the expected phenotypic ratio for the resulting flower colors is 1 red : 2 pink : 1 white.

The Punnett square for the cross of two heterozygous (RW) four o'clock plants is:

• RW (pink)
• RW (pink)

Each 'R' represents the allele for red flower color and each 'W' represents the allele for white flower color. The possible genotypes that result from this cross are RR (red), RW (pink), WR (pink), and WW (white). Since incomplete dominance is in play, the RR genotype results in red-flowered plants, RW/WR genotypes result in pink-flowered plants, and WW results in white-flowered plants. The theoretical percentages for each phenotype would be 25% red, 50% pink, and 25% white.