Question

question 10 of 10
in pea plants, the allele for yellow seeds (y) is dominant and the allele for green seeds (y) is recessive. two plants with the following genotypes are crossed:
yy×yy
what ratio of yellow seeds to green seeds should you expect in the offspring?
a. 2:2
b. 4:0
c. 3:1
d. 1:3

Explanation:

Step1: Create Punnett square

$$\begin{array}{|c|c|c|} \hline & Y & y \\ \hline Y & YY & Yy \\ \hline y & Yy & yy \\ \hline \end{array}$$

Step2: Count genotypes

• $YY$ (yellow): 1
• $Yy$ (yellow): 2
• $yy$ (green): 1

Step3: Calculate ratio

Yellow ($YY + Yy$) = 3, Green ($yy$) = 1. Ratio is 3:1.

Answer:

C. 3:1