Draw the Punnett Square below in your Science notebook and fill in the possible offspring. Use your Punnett Square to answer the question.

Question

What percent of offspring will express the recessive allele?



(1 point)
Responses

25%
25%

50%
50%

75%
75%

100%
100%

Answer 1

To determine the percent of offspring that will express the recessive allele, we need to look at the Punnett Square.

If the parents are both heterozygous for a trait (one dominant allele and one recessive allele), then the Punnett Square would look like this:

R r
R RR Rr
r Rr rr

From the Punnett Square, we can see that 25% of the offspring will be homozygous recessive (rr), expressing the recessive allele. Therefore, the correct answer is 25%.