Flower color in four-o’clock plants is under the control of a single gene. Red flower color is determined by the genotype R1R1, and white flower color is determined by the genotype R2R2. If red-flowered plants are crossed with pink-flowered plants, and 1,600 seeds are produced, how many are expected of each possible phenotype?

800 red-flowered seeds and 800 pink-flowered seeds are expected to be produced.

Explanation:

Red flower color is determined by the genotype R1R1, White flower color is determined by the genotype R2R2, Pink flower color is determined by the genotype R1R2.

The cross of red flowers with pink flowers produce 1,600 seeds. This is:

P) R1R1 x R1R2

Gametes) R1 R1 R1 R2

F1) Punet square

R1 R1

R1 R1R1 R1R1

R2 R1R2 R1R2

Genotype: 50% Homozygote

50% Heterozygote

Phenotype: 800 Red flower seeds, 50% over the total.

800 Pink flower seeds, the other 50% over the total.