Two processes that can maintain rare or deleterious alleles in populations are ________ [four words] and ________. [two words]
Fill in the blank(s) with correct word
negative frequency-dependent selection; heterozygote superiority
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What type of antibody is produced first after the initial exposure to antigen?
A. IgD B. IgM C. IgE D. IgA E. IgG
After a seed germinates, nutrients stored in endosperm (in monocots) or in ____ (in eudicots) support the seedling's growth
a. radicle b. hypocotyl c. cotyledons d. plumule e. seed coat
Fitness refers to
A. physical health of an individual. B. physical health of a population. C. reproductive success D. variation in traits within the population E. Mutations that benefit an organism's survival
Bowerbirds build elaborate nests to
A) defend their territory. B) attract prey. C) hide from predators. D) attract a mate. E) increase aggressive behavior.