How many boxes represent offspring that are heterozygous for the thorns gene?
To determine the number of boxes that represent offspring that are heterozygous for the thorns gene, we need to look for the genotypes that have one dominant allele and one recessive allele for the thorns gene. Since the genotype for thorns is represented by the letter T, the genotypes that are heterozygous for the thorns gene are Tt and tT.
Therefore, the number of boxes that represent offspring that are heterozygous for the thorns gene would depend on the given genetic cross or the number of offspring in the Punnett square.