Question

In peas, Mendel found that tall plants and yellow peas are dominant. The phenotype for a pea plant with the genotype TTyy would be.....

A) Tall with yellow peas
B) Tall with green peas
C) Dwarf with yellow peas
D) Dwarf with green peas

Answer 1

A pea plant with the genotype TTyy will be tall with green peas, as 'T' is the dominant allele for height and 'y' is the recessive allele for green seed color.

Step-by-step explanation:

The phenotype for a pea plant with the genotype TTyy would be tall with green peas, . The 'T' represents the dominant trait for tallness, and since the plant has two dominant alleles (TT), it will be tall. However, for the seed color, 'y' represents the recessive trait for green peas, and given the plant is homozygous recessive for this trait (yy), the seeds will be green. Therefore, despite having different genotypes that can result in the tall phenotype (TT or Tt), the seed color phenotype is only expressed when the plant has two recessive alleles (yy), as is the case here.