Blood samples are taken from the heel of newborn babies to test for a mutation in the PKU gene, which, if left untreated and in severe cases, can lead to mental retardation, reduced skin pigmentation, and seizures. Which concept is being illustrated by

this example?

A) incomplete dominance
B) polygenic inheritance
C) pleiotropy
D) codominance


Answer: C

Biology & Microbiology

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What will be an ideal response?

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Bulk movement of water across plasma membranes and the exchange of oxygen from blood into cells are similar in that the method of transport is by

A) facilitated transport. B) endocytosis. C) diffusion. D) active transport. E) sodium-potassium pumps.

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Tuberculosis is typically transmitted via which of the following?

A) air B) food C) sexual activity D) water

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In many cases, carbohydrates have the following ratio of elements:

A) carbon, oxygen, and hydrogen in a ratio of 1:2:1. B) carbon, hydrogen, and nitrogen in a ratio of 1:2:1. C) carbon, hydrogen, and oxygen in a ratio of 2:1:2. D) carbon and hydrogen in a ratio of 1:2. E) carbon, hydrogen, and oxygen in a ratio of 1:2:1.

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