In a Particular Plant,leaf Color Is Controlled by Gene Locus

question 6

Multiple Choice

In a particular plant,leaf color is controlled by gene locus D.Plants with at least one D allele have dark green leaves,and plants with the homozygous recessive dd genotype have light green leaves.A true-breeding dark-leaved plant is crossed with a light-leaved 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 above,where 1,2,3,and 4 represent the genotypes corresponding to each box within the square.Which of the plants 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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