Question

a homozygous tall pea plant (tt) is crossed with a heterozygous tall pea plant (tt). which statement is true about the offspring of this cross?
all of the offspring will have the same phenotype (short), but two different genotypes (tt, tt).
all of the offspring will have the same phenotype (short) and the same genotype (tt).
all of the offspring will have the same phenotype (tall), but two different genotypes (tt, tt).
all of the offspring will have the same phenotype (tall) and the same genotype (tt).

Explanation:

Step1: Determine the genotypes of the parents

The homozygous tall pea plant has the genotype \(TT\), and the heterozygous tall pea plant has the genotype \(Tt\).

Step2: Create a Punnett square

The possible gametes from the \(TT\) parent are all \(T\). The possible gametes from the \(Tt\) parent are \(T\) and \(t\). The Punnett square is:

	\(T\)	\(t\)

Step3: Analyze the genotypes and phenotypes of the offspring

The genotypes of the offspring are \(TT\) and \(Tt\). The phenotype of both \(TT\) and \(Tt\) is tall (since \(T\) is the dominant allele for tallness).

Answer:

All of the offspring will have the same phenotype (tall), but two different genotypes (\(TT\), \(Tt\)).