Question

which describes the notation tt for the trait of plant height?
homozygous genotype
heterozygous genotype
homozygous phenotype
heterozygous phenotype

Explanation:

1. First, recall definitions: Genotype refers to the genetic makeup (allele combination), phenotype is the observable trait. Homozygous has identical alleles (e.g., TT or tt), heterozygous has different alleles (e.g., Tt).
2. The notation Tt represents a genetic combination (genotype), not phenotype. Since T and t are different alleles, it's heterozygous. So "heterozygous genotype" is correct.

Answer:

B. heterozygous genotype