Which offspring in the illustration below are
homozygous recessive for both traits?
a. A
b. B
c. C
d. D
e. none of these
Answer: d
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Among which of the following will sexual dimorphism lead to females being larger than
males?
a. among species where males physically fight for access to females b. among species where a male must guard a female to prevent other males from mating with her c. among species where males have to walk long distances to find females but fighting is rare d. Females being larger than males is always beneficial because it leads to higher fecundity.
Transgenic goats are now able to produce
proteins used to treat
a. cystic fibrosis. b. heart attacks. c. blood clotting disorders. d. nerve gas exposure. e. all of these
Evolutionary history includes mass extinctions that are characterized by the sudden disappearance of a wide variety of species. What is another important consequence of mass extinctions?
a. Mass extinctions create climate changes that lead to further extinctions. b. The number of groups of organisms tends to drop following a mass extinction and then levels off. c. Species remaining after a mass extinction are poorly adapted to their environment. d. Following a mass extinction, there is always a burst of life's diversity. c. Mass extinctions are always followed by a catastrophic event.
Answer the following questions true (T) or false (F)
1. Protozoa are also called prokaryotes. 2. Single-celled organisms known as diatoms have glasslike walls and are a type of algae. 3. The use of Saccharomyces as a probiotic is an example of the application of biotechnology.