Question

In a monohybrid cross between homozygous tall \([TT]\) and homozygous dwarf \([tt]\) plants, what is the phenotype and genotype of the \(F_1\) generation?

Options

• All are phenotypically dwarf with genotype \([tt]\)

• All are phenotypically intermediate with genotype \([Tt]\)

• All are phenotypically tall with genotype \([Tt]\)

• Half are tall \([TT]\) and half are dwarf \([tt]\)

Answer 1

Crossing \([TT]\) with \([tt]\) produces \(F_1\) offspring that are all \([Tt]\). Because the \(T\) (tall) allele is dominant over the \(t\) (dwarf) allele, all \(F_1\) plants are phenotypically tall.