Question

Referring to the crosses described in the previous questions, what is the phenotypic ratio of the F2 plants? (Hint: draw Punnett squares to determine the F1 and F2 genotypes and phenotypes.)

Answer 1

The phenotypic ratio of the F2 generation in a dihybrid cross can be determined using a Punnett square. It is typically a 9:3:3:1 ratio, representing different combinations of dominant and recessive traits.

Step-by-step explanation:

In a dihybrid cross, the phenotypic ratio of the F2 generation is determined by using a Punnett square. A dihybrid cross involves the inheritance of two different traits. By analyzing the Punnett square, we can determine that the phenotypic ratio of the F2 generation is 9:3:3:1.

The 9 represents the dominant phenotype for both traits, the 3s represent the dominant phenotype for one trait and the recessive phenotype for the other trait, and the 1 represents the recessive phenotype for both traits.

For example, if we cross plants with yellow seeds (YY) and smooth texture (RR) with plants with green seeds (yy) and wrinkled texture (rr), the resulting F2 generation would have the phenotypic ratio of 9 plants with yellow seeds and smooth texture, 3 plants with yellow seeds and wrinkled texture, 3 plants with green seeds and smooth texture, and 1 plant with green seeds and wrinkled texture.