Question

In garden peas, axial flower position is a dominant trait, while terminal flower position is recessive. Tall plant height is dominant over short plant height. When a purebred tall vine with axial flowers is crossed with a short vine with terminal flowers, what will be the phenotype of their offspring? Additionally, predict the phenotypic and genotypic ratios of the offspring in the F2 generation.

Answer 1

The offspring will be tall since tall plant height is dominant over short plant height. In the F2 generation, the genotypic ratio will be 1 TT : 2 Tt : 1 tt, and the phenotypic ratio will be 3 tall plants : 1 short plant.

Step-by-step explanation:

To determine the phenotypes of the offspring, we need to use Punnett squares. Since the tall plant height is dominant over short plant height, the purebred tall vine would have the genotype TT (where T represents the tall allele) and the short vine would have the genotype tt. When crossing them, all the offspring will be heterozygous with the genotype Tt, and therefore tall.

For the F2 generation, we can use another Punnett square. When crossing two heterozygous tall plants (Tt x Tt), the genotypic ratio of the offspring will be 1 TT : 2 Tt : 1 tt. The phenotypic ratio will be 3 tall plants : 1 short plant.

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