What would be the outcome, in genetic terms, of recombination between sister chromatids?
a. Genetic diversity is unaffected.
b. Genetic diversity is decreased.
c. Genetic diversity is increased.
d. Nonhomologous chromatids are formed.
Answer: a. Genetic diversity is unaffected.
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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.
Cross-talk between second messenger pathways is probably involved in particular types of olfactory signal
transduction in many animals.
a. True b. False
Approximately how many molecules of ATP are produced from the complete oxidation of two molecules of glucose (C6H12O6) in cellular respiration?
A) 2 B) 4 C) 15 D) 38 E) 76
Which of the following statements is a hypothesis?
A. If a student buys a meal plan, he or she will eat more vegetables. B. I like my biology class better than my other classes. C. There are more calories in french fries than in colas. D. Ginny gained 5 lbs her freshman year. E. Blake failed the test.