Question

If the red colour in zinnias is incompletely dominant over white, how many pink flowers will be in the F1 generation if a red zinnia and a white zinnia are crossed? What are the phenotype and genotype ratios of the F2 generation if 2 pink flowers are crossed?

Answer 1

Crossing a red and a white zinnia results in all pink flowers in the F1 generation. When two pink F1 zinnias are crossed, the F2 generation shows a 1:2:1 ratio of red:pink:white flowers, reflective of a genotypic ratio of 1 RR:2 RW:1 WW.

Step-by-step explanation:

If a red zinnia, which has the homozygous genotype RR, is crossed with a white zinnia, with the genotype WW, the resulting F1 generation will be entirely pink, having the heterozygous genotype RW. This is because red is incompletely dominant over white, leading to an intermediate phenotype of pink.

When two pink flowers from the F1 generation are crossed, the predicted outcome in the F2 generation is a 1:2:1 phenotypic ratio of red:pink:white flowers, which corresponds to a genotypic ratio of 1 RR:2 RW:1 WW.

Therefore, the outcome of this cross will be 25% red, 50% pink, and 25% white flowers.

Answer 2

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