Use the Figure and the Following Description to Answer the Question

question 20

Multiple Choice

Use the figure and the following description to answer the question.
In a particular plant, leaf color 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-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, 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 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:

Protein Synthesis

The biological process through which cells build proteins based on the genetic instructions encoded in DNA.

Liposomes

Small artificial vesicles made of lipid bilayers, used in drug delivery systems and various biotechnological applications.

Lipids

A group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins, and other related compounds, serving as energy storage and structural components of cell membranes.

Protobionts

Early protocell structures that are believed to have preceded true living cells, consisting of a membrane-like structure enclosing biopolymers and other organic molecules.