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:

Behavioral Intention

A person's predisposition towards performing a certain action, influenced by personal attitudes and societal norms.

Theory of Planned Behavior

A psychological theory that predicts an individual's intention to engage in a behavior at a specific time and place, based on their attitude, subjective norms, and perceived behavioral control.

Attitude-Behavior Consistency

The extent to which an individual's behaviors or actions mirror their feelings and beliefs.

Effort Justification

A phenomenon where people attribute a greater value to an outcome they had to put effort into achieving, often to reduce cognitive dissonance.