Question

in a group of pea plants, some individuals have yellow peas and others have green peas. in this group, the gene for the pea color trait has two alleles. the allele for yellow peas (e) is dominant over the allele for green peas (e). this punnett square shows a cross between two pea plants. punnett square with e, e on top; e, e on left; all boxes ee what is the expected ratio of offspring with yellow peas to offspring with green peas? write the most likely ratio.

Explanation:

Step1: Analyze Genotypes

All offspring genotypes from the Punnett square are \( Ee \). Since \( E \) (yellow) is dominant over \( e \) (green), \( Ee \) individuals have yellow peas. So number of yellow - pea offspring: 4, green - pea offspring: 0.

Step2: Determine Ratio

The ratio of yellow - pea to green - pea offspring is \( \frac{4}{0} \)? Wait, no, all 4 are yellow. So yellow:green = 4:0, but simplifying (since 4 and 0 have a GCD of 4, but 0 can't be divided. Wait, actually, all offspring are yellow. So the ratio of yellow to green is 4:0, but typically we can say 1:0 (but more accurately, since all are yellow, the ratio is 4:0 or simplified as any number to 0, but in the context of Punnett square here, all 4 are \( Ee \) (yellow), 0 are \( ee \) (green). So yellow:green = 4:0, but usually written as 1:0 (but 4:0 simplifies to 1:0? Wait, no, 4 divided by 0 is undefined, but in terms of count, 4 yellow, 0 green. So the ratio is 4:0, but maybe the problem expects 4:0 or 1:0 (but 4:0 is more accurate here). Wait, no, let's check again. The Punnett square has 4 cells, all \( Ee \). So yellow ( \( Ee \)): 4, green ( \( ee \)): 0. So the ratio is 4:0, which can be written as 1:0 (but 4:0 is correct). Wait, maybe I made a mistake. Wait, the dominant allele is \( E \), so \( Ee \) is yellow. So all 4 offspring are yellow, 0 are green. So the ratio of yellow to green is 4:0, or simplified, since 4 and 0, the ratio is 1:0 (but 4:0 is the actual count). So the expected ratio is 4:0, which can be written as 1:0, but more accurately, 4:0.

Answer:

4:0 (or 1:0, but 4:0 is more precise based on the Punnett square count)