Hybridization of two species in which of the following cases could lead to the extinction of one of the original species?
A) Hybridization increases inbreeding, which decreases the average fitness of the species.
B) It may introduce deleterious genes from one species to another.
C) The two species increase their population sizes, thus increasing the effects of genetic drift.
D) An endangered species may further decline by producing less-fit hybrid offspring.
E) The hybrid offspring may outcompete the parental species.
D
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In analyzing microarray data if the ratio of mRNA present before and after a particular treatment is 1 it indicates that
A. there was no change in mRNA levels before and after treatment B. the gene was not expressed either before or after treatment. C. gene expression could not be detected. D. mRNA was not detected before treatment.
What is a key feature of an open circulatory system?
a. No vessels carry the blood. b. Open-ended vessels carry the blood. c. Closed vessels carry the blood. d. No heart pumps the blood. e. Hemoglobin is carried in the blood.
The functional unit of the kidney is called
A. Bowman's capsule. B. a collecting duct. C. a nephron. D. a loop of Henle.
Which factor increases the likelihood of population extinction?
A. large population size B. isolation of a population from sources of immigrants C. isolation of a population from density-independent effects D. high resource availability E. high genetic diversity