What Is the Greatest Contributing Factor in the Loss of Polar

question 6

Multiple Choice

What is the greatest contributing factor in the loss of polar bears in arctic areas?

• A)hunting of the polar bear by the Inuit people
• B)the tundra shifting northward
• C)fires in the taiga and tundra
• D)decline in sea ice
• E)the decline of lemmings; the primary food of the polar bear

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Definitions:

Genetic Locus

A specific, fixed position on a chromosome where a particular gene or genetic marker is located.

X Chromosomes

One of the two sex chromosomes, present in both males (XY) and females (XX), that determine sexual differentiation in humans.

Phenylalanine Hydroxylase

An enzyme that converts phenylalanine into tyrosine, thus playing a crucial role in amino acid metabolism.

Phenylketonuria (PKU)

A genetic disorder characterized by an inability to metabolize the amino acid phenylalanine, leading to developmental problems if untreated.