Which of the following is the best example of how we can separate the effects of genes and the environment on the expression of a complex trait?
A. About 80% of an individual's height is
determined by genes and 20% by
environment.
B. For identical twins raised in the same
environment, height should not differ by more
than 20%.
C. In a group of individuals of the same sex,
about 80% of the variation in height among
individuals is due to genetic differences and
20% is due to environmental differences.
D. If one individual is 60 inches tall and
another is 70 inches tall, they differ in about
80% of their genes.
E. None of these choices accurately illustrate
how we can separate the effects of genes
and the environment on the expression of a
complex trait.
C
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Barnacles belong to which of the following groups of invertebrates?
a. crustaceans b. mollusks c. annelids d. chelicerates e. brachiopods
How do turtles differ from other reptiles?
a. they are mostly predators b. they do not have internal fertilization c. they give birth to live young d. they do not have teeth e. they must live part of their live in water
Which of the following is a way that antibodies fight infection?
a. They reduce the inflammation response to prevent the body from overheating. b. They engulf and kill pathogens through phagocytosis. c. They bind to pathogens and interfere with the pathogen’s ability to infect or bind to other cells. d. They stimulate a passive response to the presence of a pathogen.
The carbon source for organisms that derive their
energy from photosynthesis is a. the soil. b. carbon dioxide. c. any hydrocarbon. d. methane. e. glucose.