Most genetic disorders of humans are caused by

A) multiple alleles.
B) recessive alleles.
C) a mutation that occurs in the egg, sperm, or zygote.
D) dominant alleles.


Answer: B

Biology & Microbiology

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a. True b. False

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A patient, complaining about persistent drowsiness and difficulty conceiving children undergoes a series of tests, during which it is shown that he has a significantly diminished sperm count. Excess production of which hormone could account for these symptoms?

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Viruses that attack bacteria are called:a

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Which of the following organisms would be most likely to fossilize?

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