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In a Particular Plant, Leaf Colour Is Controlled by Gene

question 46

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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 F1 offspring is allowed to self-pollinate. The predicted outcome of the F2 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. 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<sub>1 </sub>offspring is allowed to self-pollinate. The predicted outcome of the F<sub>2</sub> 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.   - Which of the boxes marked 1-4 correspond to plants that will be true-breeding? A)  1 and 4 only B)  2 and 3 only C)  1, 2, 3 and 4 D)  1 only
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Which of the boxes marked 1-4 correspond to plants that will be true-breeding?


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