[Nicolas Sanchez]

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A pea plant is heterozygous for seed colour and homozygous for seed shape.
Yellow seed colour (Y) is dominant to green seed colour (y). Round seed shape (R) is
dominant to wrinkled seed shape (r).
Using the information provided, which of the following statements, taken independently, could be correct?

1 This plant contains the alleles Y, y, R and r.
2 This plant contains only the alleles Y, y and R.
3 This plant contains only the alleles Y, R and r.
4 The genotype of this plant for seed colour is Yy.
5 The genotype of this plant for seed colour is YY.
6 The genotype of this plant for seed shape is Rr.
7 The genotype of this plant for seed shape is rr.
A. 1, 4 and 7 only
B. 1, 5 and 6 only
C. 2, 4 and 6 only
D. 2, 4 and 7 only
E. 2, 5 and 7 only
F. 3, 4 and 7 only
G. 3, 5 and 6 only
H. 3, 5 and 7 only

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Discussion

[Paris]

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If you read it carefully, you will see that the genotype for the colour is Yy only. On the other hand, the seed shape genotype might be either RR or rr since we do not know the shape but only the fact that it is homozygous.

Then, we can see that the correct statements are 2,4 and 7.

The answer is D.