Humans carry two alleles for earlobe shape E for freehanging

Humans carry two alleles for earlobe shape: E for free-hanging earlobes and e for attached earlobes. Considering that free-hanging earlobes are dominant to attached earlobes, please draw a Punnett Square in the space below crossing a heterozygous individual with free-hanging earlobes with an individual with attached earlobes and include what the percentage of the offspring is homozygous dominant, homozygous recessive, heterozygous, attached earlobes and free-hanging earlobes.

Solution

E : free-hanging earlobes (Dominant) e: attached earlobes (Recessive)

heterozygous individual x homozygous individual

Ee x ee

percentage of the offspring

1) homozygous dominant : 0

2) homozygous recessive (ee) : 50%

3) heterozygous (Ee): 50 %

percentage of the offspring with attached earlobes (ee) : 50%

percentage of the offspring with free-hanging earlobes (Ee) : 50%