Question

jack and jill were brother and sister, but didnt look alike at all. jack had attached earlobes (recessive) and jill had free earlobes (dominant). jill knew her parents were heterozygous for earlobe shape, so she drew the following punnett square:| | e | e ||---|---|---|| e | ee | ee || e | ee | ee |what type of earlobes do jills parents have?○ both parents have attached earlobes○ both parents have free earlobes○ one parent has attached earlobes and one parent has free earlobes○ not enough information given1 pts

Explanation:

Step1: Recall genotype-phenotype links

Free earlobes (dominant): $EE$ or $Ee$; Attached earlobes (recessive): $ee$

Step2: Analyze offspring genotypes

Jack ($ee$) gets 1 $e$ from each parent. Jill (free earlobes) must get at least 1 $E$ from a parent.

Step3: Deduce parental genotypes

To produce $ee$ (Jack), one parent contributes $E$ (has free earlobes, $Ee$) and the other contributes $e$ (has attached earlobes, $ee$). This matches the Punnett square cross $Ee \times ee$.

Answer:

One parent has attached earlobes and one parent has free earlobes