Answer:
The probability of Harry having blue eyes is 25%, and the Punnett square for his parents' alleles would be Bb x bb.
Step-by-step explanation:
Assuming that Lily Potter is homozygous recessive (bb) for the blue eye trait and James Potter is heterozygous (Bb) for the brown eye trait, the Punnett square for their offspring would be:
| B b
--|--------
b | Bb bb
b | Bb bb
Each box represents a possible combination of alleles that their child could inherit. There are two possible outcomes in which Harry has blue eyes: he could inherit the b allele from Lily and the b allele from James, or he could inherit the b allele from Lily and the B allele from James, which would make him a carrier of the blue eye trait but with brown eyes.
Therefore, the probability of Harry having blue eyes is 1/4 or 25%.