The offspring of two heterozygous gray-bodied, normal-winged flies should be 50% graybodied/
normal wings (BbRr) and 50% black-bodied/vestigial wings (bbrr) because these alleles are
linked. If a small number, say 15%, of the offspring are instead black-bodied with normal wings, this
is most likely the result of:
a. crossing-over.
b. incomplete dominance.
c. codominance.
d. an error in meiosis.
e. mutation.
A
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The largest of the viruses are similar in size to some small bacteria and are large enough to be seen with a light microscope.
Answer the following statement true (T) or false (F)
Which situation would represent a trade-off between survival and reproduction?
A. The production of many offspring results in smaller offspring. B. Mating activity and egg production reduce the longevity of both sexes. C. All listed D. Human parents have less sleep and higher rates of disease infection than nonreproductive individuals. E. Survival to greater age comes at the expense of early reproduction.
Biomes are broad regional areas with defined flora and fauna. Which one of the following choices correctly identifies the biomes shown plotted in the graph of precipitation versus temperature? 
A. Tropical Rain forest = 3; Desert = 4; Tundra = 1; Grassland = 2 B. Tropical Rain forest = 3; Desert = 1; Tundra = 2; Grassland = 3 C. Tropical Rain forest = 1; Desert = 3; Tundra = 4; Grassland = 2 D. Tropical Rain forest = 1; Desert = 2; Tundra = 3; Grassland = 4
Which human trait would be expected to have high concordance?
A) weight B) hair length C) contracting measles D) eye color