Which phenotype reappears in the F2 generation after a cross of two heterozygous plants (Tt)?

Which phenotype reappears in the F2 generation after a cross of two heterozygous plants (Tt)?

• A. Tall
• B. Short
• C. Intermediate
• D. All of the above

Answer: (D)

The phenotype that reappears in the F2 generation after a cross of two heterozygous plants, both represented as Tt, demonstrates classic Mendelian inheritance patterns. In this case, T represents the dominant allele for tallness, and t represents the recessive allele for shortness. When two heterozygous plants (Tt) are crossed, the expected genotypic ratio in the F2 generation is as follows: - 1 TT (homozygous dominant) - 2 Tt (heterozygous) - 1 tt (homozygous recessive) This combination results in three genotypes producing the tall phenotype (TT and Tt) and one genotype producing the short phenotype (tt). Therefore, both tall and short plants will be present in the F2 generation. Additionally, when considering incomplete dominance, where phenotypes blend or show intermediate traits, there could be instances where an intermediate phenotype appears, especially if other traits were considered. However, in the classical dominance scenario described here, tall and short phenotypes are the focus. Since tall (TT and Tt) and short (tt) plants are present distinctly, and under certain crossing conditions, an intermediate phenotype could be observed,

The phenotype that reappears in the F2 generation after a cross of two heterozygous plants, both represented as Tt, demonstrates classic Mendelian inheritance patterns. In this case, T represents the dominant allele for tallness, and t represents the recessive allele for shortness.

When two heterozygous plants (Tt) are crossed, the expected genotypic ratio in the F2 generation is as follows:

• 1 TT (homozygous dominant)

• 2 Tt (heterozygous)

• 1 tt (homozygous recessive)

This combination results in three genotypes producing the tall phenotype (TT and Tt) and one genotype producing the short phenotype (tt). Therefore, both tall and short plants will be present in the F2 generation.

Additionally, when considering incomplete dominance, where phenotypes blend or show intermediate traits, there could be instances where an intermediate phenotype appears, especially if other traits were considered. However, in the classical dominance scenario described here, tall and short phenotypes are the focus.

Since tall (TT and Tt) and short (tt) plants are present distinctly, and under certain crossing conditions, an intermediate phenotype could be observed,