Haiti Is Settled by Peoples of Both African and European

question 7

Multiple Choice

Haiti is settled by peoples of both African and European ancestry. A young couple, both with mixed ancestry, marry and have several children. The children vary widely in the amount of skin melanin production, with one child being lighter than both parents, and one being darker. The simple explanation for this is

• A) epistasis.
• B) multiple alleles are available for the one chromosomal locus that governs skin color.
• C) the environment affected the phenotype that developed.
• D) polygenic inheritance.
• E) gene linkage.

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Definitions:

Casparian Strip

A waterproof barrier within the cell walls of plant roots that controls the flow of water and dissolved substances into the plant.

Endodermal Cells

Cells that make up the endoderm, the innermost layer of cells or tissue of an embryo in early development, which gives rise to the lining of the digestive and respiratory systems.

Eudicot Root

Eudicot Root refers to the root structure of eudicots, which are a major group of flowering plants characterized by having two seed leaves, or cotyledons, and a branching root system.

Vascular Cylinder

The central core of a plant's root, containing the vascular tissue (xylem and phloem) which transports water, nutrients, and sugars.