Question

Why are \([TT]\) and \([Tt]\) pea plants phenotypically identical despite being genotypically different?

Options

• Because the \(t\) allele mutates into a \(T\) allele during fertilization

• Because the dwarf allele is lost due to segregation

• Because both alleles undergo codominance to express tallness

• Because the \(T\) allele is completely dominant over the recessive \(t\) allele

Answer 1

Plants with genotypes \([TT]\) and \([Tt]\) both display the tall phenotype because the dominant \(T\) allele completely masks the expression of the recessive \(t\) allele in the heterozygous condition.