Question

according to mendels law of dominance, we would expect ______ percent of the offspring to have white flowers
a 0%
b 10%
c 25%
d 50%

Explanation:

Step1: Count total outcomes

The Punnett square has 4 cells: \( RR, Rr, Rr, rr \), so total outcomes \( n = 4 \).

Step2: Identify white - flowered (rr)

White - flowered is \( rr \), which appears 1 time.

Step3: Calculate probability

Probability \( P=\frac{\text{Number of } rr}{\text{Total outcomes}}=\frac{1}{4} = 25\% \). Wait, but looking at the options, maybe the question is about a different phenotype. Wait, maybe the dominant is R (red) and recessive r (white). Wait, no, maybe the white is when it's rr? Wait, no, maybe the question is about a different trait. Wait, looking at the Punnett square: \( RR, Rr, Rr, rr \). If white is \( rr \), then 1 out of 4 is 25%, but if the question is about a different genotype. Wait, maybe the question is about the percentage of offspring with a certain genotype. Wait, the options are A. 0%, B. 10%, C. 25%, D. 50%. Wait, maybe the white - flowered is \( rr \), so the number of \( rr \) is 1, so \( \frac{1}{4}=25\% \), so the answer is C? Wait, no, maybe I misread. Wait, the Punnett square: top row R and r, left column R and r. So the cells are (R,R)=RR, (R,r)=Rr, (r,R)=Rr, (r,r)=rr. So if white is rr, then 1/4 = 25%, so the answer is C (25%).

Answer:

C. 25%