The gross reproductive rate is
A) the total number of offspring born to a population.
B) the total number of offspring born to a population each year.
C) the average number of female offspring born in a year.
D) the average number of female offspring born to her over her lifetime.
D
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In order for natural selection to occur within a population, certain conditions must be met. One such condition is
A. heterozygosity must be very low. B. frequent mutations that are inherited. C. phenotypic differences resulting from environmental conditions. D. phenotypic variations that are genetic. E. low rates of immigration.
A mutation in which the fate of cell lineages is not synchronized in an organism is called a ____
A. heterochronic mutation B. apoptotic mutation C. homeotic mutation D. homeobox mutation
Which hormone slows bone deposition?
a. cortisol b. calcitonin c. estrogen d. testosterone e. growth hormone
A reflex pathway is the simplest pathway because it _____.
A. involves only one synapse B. is evaluated and integrated by the medulla, not the cerebrum C. does not involve conscious thought or learning D. does not involve the central nervous system in any way E. involves only one neurotransmitter