Question

how are the plant height genotypes tt and tt similar? (1 point)
both are examples of heterozygous genotypes.
both are examples of homozygous genotypes.
both are expressed as a short phenotype.
both are expressed as a tall phenotype.

Explanation:

• Heterozygous vs homozygous: A heterozygous genotype has two different alleles (\(Tt\)), while a homozygous genotype has two of the same alleles (\(TT\) or \(tt\)). So \(TT\) is homozygous and \(Tt\) is heterozygous, eliminating the first two options.
• Phenotype expression: In Mendelian genetics, for a trait like plant height where \(T\) (tall) is dominant over \(t\) (short), \(TT\) (homozygous dominant) and \(Tt\) (heterozygous) both express the dominant trait (tall). Only \(tt\) would express the recessive (short) phenotype.

Answer:

Both are expressed as a tall phenotype.