In certain plants, leaf color is controlled by gene D. Plants with a dominant allele D have dark green leaves and plants with the homozygous recessive dd genotype have light green leaves. 2 heterozygous plants are crossed and the square is seen below. Which boxes will correspond to dark leaved plants?
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4 points
Captionless Image
1 and 2 only
4 only
1 only
1, 2 and 3 only
2 and 3 only