Red-green color blindness is an X-linked recessive trait in humans. A color-blind woman and a man

with normal vision have a son. What is the probability that the son is color-blind?
a. 100 percent
b. 75 percent
c. 50 percent
d. 25 percent
e. 0 percent


A

Biology & Microbiology

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Is antigenic shift alone likely to lead to influenza pandemics?

A. Yes-ONLY antigenic shift can lead to the large-scale mixing of gene elements required to produce a pandemic flu strain. B. No-ONLY antigenic DRIFT can lead to the large-scale mixing of gene elements required to produce a pandemic flu strain. C. Perhaps-but it would most likely be a mixture of antigenic shift AND drift that would result in a pandemic strain. D. No-antigenic SHIFT is responsible for changes in the hemagglutinin protein, while antigenic DRIFT is responsible for changes in the neuraminidase protein. You must have changes in both to lead to a pandemic strain.

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The genomes of ________ cannot function as mRNA and therefore these viruses must bring at least one RNA-dependent RNA polymerase into the host cell during entry.

A. double-stranded DNA viruses B. negative-strand RNA viruses C. single-stranded DNA viruses D. positive-strand RNA viruses

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Bark consists of all tissues outside the cork cambium

____________________ Indicate whether the statement is true or false.

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Ecdysone, a steroid hormone, controls ____.

A. the menstrual cycle B. molting in arthropods C. the wake-sleep cycle D. the formation of hormone receptors E. the formation of sperm

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