The chance of a child having albinism when both of his parents are heterozygous for the disorder is ____ percent
a. 0
b. 25
c. 33
d. 50
e. 75
b
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Answer the following statement(s) true (T) or false (F)
1. Researchers in England found that, for three out of four habitat types they were studying, the most efficient strategy was to create a system of stepping stones linking existing habitat clusters. "Stepping stones" are a type of corridor. 2. The degree of allelic diversity of a population is independent of its size. 3. If the tilt of Earth's axis relative to its plane of orbit was increased to 30 degrees, the seasons in Boston would become less distinct. 4. Homo sapiens have existed on earth for 2% of the earth's history. 5. Prokaryotic organisms were the only life-forms present on earth for almost 2 billion years. Multicellular eukaryotes have only been around for about 25% of earth's history
In the human eye, what provides the greatest visual acuity (the precise discrimination between adjacent
points in space)? a. photoreceptors in the sclera b. photoreceptors in the fovea c. protein filaments in the lens d. photoreceptors in the optic nerve e. photoreceptors throughout the retina
The Clean Air Act of 1990 was important because it specifically
A. stated that all politicians would from then on be pro-environment. B. detailed ways of making our air crystal clean by the year 2000. C. required scrubbers on smokestacks of coal-fired plants. D. punished polluters.
In a drug trial investigating the effects of a new drug, neither the research scientists nor the participants know if they are in the treatment or the control group. What does this type of study design control for?
A) experimenter bias B) extraneous variables C) placebo effect D) spurious correlations E) non-random assignment