Which of these is the smallest unit that natural selection can change?
A) a species? gene frequency
B) a population?s gene frequency
C) an individual?s genome
D) an individual?s genotype
E) an individual?s phenotype
Ans: B) a population?s gene frequency
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Which of the following contributes to the removal of organic material in home sewage treatment system leach fields?
A. Entrapment of microbes B. Adsorption of organic material C. Aerobic digestion D. All of these choices are correct.
Using the chi-square test for goodness of fit, how many degrees of freedom are in this data set?
A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table.
A) 1
B) 2
C) 3
D) 4
Which of the following chemicals is the first
hormone secreted by the intestinal tract in response to the presence of food? a. insulin b. cholecystokinin c. gastric inhibitory peptide (GIP) d. gastrin e. secretin
When r = 0.00001, the population size:a
will increase. b. will decrease. c. is stable. d. may increase or decrease, depending on K. e. may increase or decrease, depending on i