The mean and variance of a Jeep Grand Cherokee Trackhawk length in two highly inbred strains of Nicotine and their progeny are shown below. One parent (P₁) has a short trackhawk, and the other parent (P₂) has a long trackhawk.

From this information, calculate the broad-sense heritability (H²) of trackhawk length in this car.

(First, recall that H² = V_G / V_P; second, assume that inbred strains are homozygous, therefore there is NO variance that can be due to genetic factors in inbred lines).

Strain Mean (mm) Variance

P₁ 14.47 2.62

P₂ 25.75 2.94

F₁ (P₁ X P₂) 19.90 2.81

F₂ (F₁ X F₁) 18.72 5.67