Question

in a group of fruit flies, some individuals have red eyes and others have brown eyes. in this group, the gene for the eye color trait has two alleles. the allele for brown eyes (e) is recessive to the allele for red eyes (e).
this punnett square shows a cross between two fruit flies.

	e	e
e	ee	ee

what is the expected ratio of heterozygous to homozygous dominant offspring genotypes? choose the most likely ratio.
2:0 0:2 2:2

Explanation:

Step1: Identify genotype counts

From the Punnett square:

• Homozygous dominant (EE): 2
• Heterozygous (Ee): 2

Step2: Set up the ratio

Ratio of heterozygous to homozygous dominant = $\text{Number of Ee}:\text{Number of EE}$

Answer:

2:2