The Punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. In this cross, tallness (H) is dominant to shortness (h). A Punnett square is shown. The columns are labeled Upper D and Upper H. The rows are labeled h and h. Clockwise from upper left the boxes contain: Upper H h, Upper H h, Upper H h, Upper H h. Based on the Punnett square, what is the phenotype of the offspring? Hh HH tall short

tall

Explanation:

This question illustrates a single gene coding for height. According to the question, allele "H" coding for tallness is dominant over allele "h" coding for shortness. This means that tall trait will be expressed over short trait in a heterozygous state.

In a cross between a parents that produce gametes H and H, and h and h respectively, the parent's genotypes are HH and hh.

HH- truebreeding tall parent

hh- truebreeding short parent

After using the punnet square, all the offsprings will have a Hh genotype, which based on dominance will exhibit the tall trait as phenotype. The offsprings with genotype Hh are phenotypically tall because the tall trait is dominant over the short trait in a heterozygous condition (Hh).

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