Punnett Square Practice Challenge

What does a capital letter represent in a Punnett square?

• A recessive allele

• A homozygous trait

• A dominant allele

• A heterozygous trait

In a cross between a green pea plant (Gg) and a yellow pea plant (gg), what is the expected phenotype ratio?

• 2 green: 2 yellow

• 1 green: 3 yellow

• 3 green: 1 yellow

• 4 green: 0 yellow

If a tall plant (TT) is crossed with a tall plant (Tt), what is the expected genotype ratio?

• 2 TT: 2 Tt

• 1 TT: 2 Tt: 1 tt

• 1 TT: 1 Tt: 2 tt

• 3 TT: 1 Tt

What is the phenotype ratio for a cross between a red flower (Rr) and a white flower (rr)?

• 4 red: 0 white

• 3 red: 1 white

• 2 red: 2 white

• 1 red: 3 white

In a cross between two heterozygous white rabbits (Ww), what is the expected genotype ratio?

• 1 WW: 2 Ww: 1 ww

• 3 WW: 1 Ww

• 2 WW: 2 Ww

• 1 WW: 1 Ww: 2 ww

What is the phenotype ratio for a cross between two heterozygous red flowers (Rr)?

• 3 red: 1 white

• 1 red: 3 white

• 2 red: 2 white

• 4 red: 0 white

In a cross between a homozygous tall plant (TT) and a heterozygous tall plant (Tt), what is the expected phenotype ratio?

• 1 tall: 3 short

• 3 tall: 1 short

• 2 tall: 2 short

• 4 tall: 0 short

What is the expected genotype ratio for a cross between a heterozygous white rabbit (Ww) and a homozygous black rabbit (ww)?

• 1 Ww: 3 ww

• 3 Ww: 1 ww

• 2 Ww: 2 ww

• 1 WW: 2 Ww: 1 ww

In a cross between two heterozygous red flowers (Rr), what is the expected genotype ratio?

• 1 RR: 2 Rr: 1 rr

• 2 RR: 2 Rr

• 3 RR: 1 Rr

• 1 RR: 1 Rr: 2 rr

What is the expected phenotype ratio for a cross between a heterozygous white rabbit (Ww) and a homozygous black rabbit (ww)?

• 3 white: 1 black

• 1 white: 3 black

• 4 white: 0 black

• 2 white: 2 black