If both parents are homozygous for a disease-causing recessive gene, ____________________ of their children will be affected
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During generalized transduction
A. the host chromosome is degraded into randomly sized fragments. B. any bacterial gene may be transferred to the subsequent host. C. any DNA fragment of the appropriate size is packaged. D. All of the choices are correct.
Humans acquire typhoid fever by
A. ingesting water or food contaminated with feces. B. mosquito bites. C. inhalation of contaminated dust particles. D. sexual activity.
Mutations are important because they do what?
(A) provide variation that can result in evolutionary change. (B) occur in response to environmental demands. (C) are always beneficial in the individuals affected by them. (D) usually provide an individual with increased reproductive rates.
Recall that over the last 400,000 years, atmospheric CO2 levels have fluctuated, with the lowest levels occurring during glacial periods and the highest levels seen during interglacial periods
Why might atmospheric CO2 levels be lower during glacial periods? A. During glacial periods there are more volcanic eruptions. B. During glacial periods there are fewer photosynthesizing plants. C. During glacial periods more carbon is stored in ocean reservoirs. D. During glacial periods chemical weathering stops.