Approximately _____ percent of human births in the U.S. are the result of in vitro fertilization
a. 0.5
b. 1.5
c. 5
d. 10
e. 25
b
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An agent that prevents the growth of bacteria without causing irreversible damage to the bacteria is referred to as ________.
Fill in the blank(s) with the appropriate word(s).
In twin studies, scientists measure _____, which is defined as _____
A. heritability; the extent to which variation in phenotype in a population is due to variation in genotype. B. concordance; the percentage of cases in which both members of a pair of twins show the trait when at least one member shows it. C. concordance; the percentage of cases in which both members of a pair of identical twins, but not fraternal twins, show the trait when at least one member shows it. D. concordance; the percentage of cases in which both members of a pair of fraternal twins, but not identical twins, show the trait when at least one member shows it. E. concordance; the extent to which differences in the environment influences differences in phenotype.
Working in an experimental fertility clinic, a researcher removes one cell from an 8-cell stage chimpanzee embryo. What is the likely result?
A. Both the cell and the blastula will die. B. All the cells are already committed and therefore are not viable. C. The embryo from which the cell was removed still remains viable and can form a normal chimp. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about early development? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
When prey produce so many offspring in a short period of time that predators can attack only a fraction of them, it is referred to as
A) a numerical response. B) a functional response. C) predator satiation. D) cryptic reproduction.