Context: This passage describes the ear type trait in rats:
Some rats have dumbo ears, which are larger and rounder than normal ears. Dumbo ears are also set on the sides of the rat's head instead of on the top. The word dumbo comes from the name of a cartoon elephant whose ears had a similar appearance.
In a group of rats, some individuals have normal ears and others have dumbo ears. In this group, the gene for the ear type trait has two alleles. The allele for normal ears (E) is dominant over the allele for dumbo ears (e).
This Punnett square shows a cross between two rats.
What is the expected ratio of offspring with dumbo ears to offspring with normal ears? Choose the most likely ratio.
A. 3:1
B. 0:4
C. 2:2
D. 4:0
E. 1:3
Pick the correct answer from the listed options and provide the letter of the selected option.
Answer: B