In a particular plant, leaf colour is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leafed plant is crossed with a light-leafed one, and the F 1 offspring is allowed to self-pollinate. The predicted outcome of the F 2 is diagrammed in the Punnett square shown in the figure, where 1, 2, 3 and 4 represent the genotypes corresponding to each box within the square.
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Which of the boxes marked 1-4 correspond to plants with dark leaves?
A) 1 only
B) 2 and 3
C) 4 only
D) 1, 2 and 3

Question

In a particular plant, leaf colour is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leafed plant is crossed with a light-leafed one, and the F 1 offspring is allowed to self-pollinate. The predicted outcome of the F 2 is diagrammed in the Punnett square shown in the figure, where 1, 2, 3 and 4 represent the genotypes corresponding to each box within the square. 
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Which of the boxes marked 1-4 correspond to plants with dark leaves?
A) 1 only 
B) 2 and 3 
C) 4 only 
D) 1, 2 and 3

Quizplus · Accepted Answer

The question implies that boxes 1, 2, and 3 contain plants with dark leaves, as indicated by the choice.

In a Particular Plant, Leaf Colour Is Controlled by Gene