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Unformatted text preview: UNIT III EXAM- FORM A BSC 2011- 02 Fall 2008 Name, please: _______________________________________ 1) In a Hardy- Weinberg population with two alleles that show complete dominance, the frequency of the recessive allele is 0.4. What percentage of the population has a homozygous genotype? A) 36 B) 4 C) 40 D) 16 E) 52 2) Which of the various species concepts distinguishes two species based on whether genes are exchanged between their gene pools? A) phylogenetic B) morphological C) biological D) ecological The 3 questions below are based on the following description. Several closely related rey species in the same genus are found in a wooded area in the Apalachian mountains. The species remain distinct by reproductive barriers. In each case, match the various descriptions of reies below with the appropriate reproductive barrier listed. 3) One species lives close to the ground; another species lives in treetops. A) temporal B) gametic C) mechanical D) habitat E) behavioral 4) Males of several different species choose mates based on different ash frequencies. A) behavioral B) habitat C) gametic D) mechanical E) temporal 5) One species ashes at dusk, and another only ashes once darkness has completely fallen. A) habitat B) gametic C) mechanical D) temporal E) behavioral 6) The higher the proportion of loci that are xed in a population, the lower is that populations _____. A) nucleotide variability. B) average heterozygosity. C) diploidy. D) A and B E) A, B, and C 7) Which of the following factors would not contribute to allopatric speciation? A) The isolated population is exposed to different selection pressures than the ancestral population. B) A population becomes geographically isolated from the parent population. C) Gene ow between the two populations is extensive. D) The separated population is small, and genetic drift occurs. E) Different mutations begin to distinguish the gene pools of the separated populations. 8) A eld mouse population has a gene with two alleles, F and f. Seventy percent of the gametes produced in the population contain the F allele. If the population is in Hardy- Weinberg equilibrium, what proportion of the mice carry both F and f ? A) 0.42 B) 0.7 C) 0.49 D) 0.21 E) 0.09 1 9) There are 25 individuals in population 1, all of which have genotype RR, and there are 15 individuals in population 2, all of genotype rr. Assume that these populations are located far from one another and that their environmental conditions are very similar. Based on the information given here, the observed genetic variation is mostly likely an example of _____. (read & think carefully!) A) directional selection. B) gene Fow. C) genetic drift....
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