Under which of the following conditions would genetic drift exert the greatest influence?
A) a population with a large range
B) a very small population
C) a very large population
D) a population that has access to sufficient resources
B
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When the left ventricle contracts, blood moves into the:
a. aorta b. pulmonary artery c. left atrium d. superior vena cava e. pulmonary circuit
Which of the following adaptations to life on land is found in both insects and modern reptiles?
a. ability to fly b. tracheae to distribute oxygen c. two pairs of walking legs d. metamorphosis from a larval form e. body surfaces that resist evaporation
Humans acquire their first microorganisms during ____
a. fetal development b. nursing c. vaginal delivery d. the first year of life e. exposure to the air
Which statement is TRUE?
a. Environment can readily alter some genotypes. b. Genotype is manifested in phenotype. c. Unlike phenotypic variation, genetic variation is easily observable. d. Variation dies with individuals. e. Phenotype is seen physically in the genotype.