In a Particular Plant, Leaf Colour Is Controlled by Gene

question 20

Multiple Choice

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.
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Which of the boxes marked 1-4 correspond to plants with a heterozygous genotype?

• A) 1
• B) 1, 2 and 3
• C) 2 and 3
• D) 2, 3 and 4

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Definitions:

Opportunity Cost

The foregone benefit that would have been derived by an option not chosen.

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Potential different courses of action considered in a decision-making process.

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A term used in cost accounting to describe materials or products that are subjected to additional operations or stages of processing beyond the initial production stage.

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