Question

a red flower (rr) is crossed with a green flower (rr). what percentage of offspring is homozygous? 18/21 50% 25% 0% 45%

Explanation:

Step1: Set up Punnett - square

The red flower (Rr) can produce gametes R and r, and the green flower (rr) can produce only r gametes.

Step2: Fill in Punnett - square

	R	r
r	Rr	rr

Step3: Count homozygous offspring

Out of 4 possible offspring genotypes (2 Rr and 2 rr), 2 are homozygous (rr).

Step4: Calculate percentage

The percentage of homozygous offspring is $\frac{2}{4}\times100\% = 50\%$.

Answer:

50%