High School

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A horticulturalist wants to produce geraniums with specific characteristics. She knows that the trait of red flowers is governed by the allele R (RR and Rr) and the trait of white flowers is governed by the allele r (rr). The horticulturalist crosses two geraniums from the F1 generation. Look at the Punnett square to see this cross:

```
R r
R RR Rr
r Rr rr
```

Which ratio of red-to-white flowering plants would she expect to see in the phenotypes of the F2 generation?

A. All red
B. 3 red: 1 white
C. 1 red: 3 white
D. 2 red: 2 white

Answer :

Its a little hard to tell what the Punnett Square looks like but I think:

The phenotypic ratio for red to white flowering plants in the F2 generation would be:

1 (RR) : 2 (Rr) : 1 (rr)

Therefore, the correct ratio of red to white flowering plants in the F2 generation is 1:2.

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