Please Use the Following Information to Answer the Question(s) Below

question 40

Multiple Choice

Please use the following information to answer the question(s) below.
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 Figure 11.1, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Figure 11.1
-Which of the boxes correspond(s) to plants with a heterozygous genotype?

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

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Definitions:

Oligodendroglia

Glial cells in the CNS that myelinate axons.

Myelin

A fatty substance that surrounds the axon of some nerve cells, forming an insulating layer that is essential for the proper functioning of the nervous system, speeding up the transmission of nerve impulses.

Saltatory Conduction

A process whereby nerve impulses jump between gaps in the myelin sheath of neurons, speeding up signal transmission.

Nodes

Points of intersection or branching in a network or circuit, often used in the context of biological and technological systems.