During which stage of the cell cycle are chromosomes duplicated?
a. mitosis
b. S phase
c. interphase
d. cytokinesis
B
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DTC genetic tests (select all correct choices):
A. can be purchased directly by consumers. B. involve the active intervention of medical professionals at each stage of the process, from initial submission of samples to final consultation with the consumer. C. may or may not be reliable. D. are the best way to determine whether or not an individual carries an allele associated with a specific disease. E. none of these
The continental rise is composed of sediments deposited from:
a. biological activity. b. underwater landslides. c. midocean ridges. d. windblown sources. e. cosmogenous sources.
Infants who are homozygous dominant for achondroplasia
a. are often stillborn. b. grow to be no taller than two feet. c. grow taller than individuals who are heterozygous. d. attain a normal height. e. do not develop arms and legs.
Natural selection for a certain phenotype will affect the
A. genotype of a population. B. allele frequency of a population. C. allele frequency of an individual. D. genotype of an individual.