Exam 3 Quiz Questions Flashcards
Quiz 8, 9, &, 10
A population carries two alleles at a locus. One allele has a minuscule fitness advantage. What is the long-term rate of the locus if natural selection is the only important evolutionary force?
A: Eventually the beneficial allele will be fixed by natural selection.
B: Both alleles will remain in the population at a ratio proportional to the fitness difference.
C: The population size will increase.
D: The population size will decrease
A
Which of the following DOES NOT demonstrate evidence for evolution?
A: After exposure to an antibiotic, antibiotic-resistant bacteria increase in frequency relative to non-resistant bacteria in the population.
B: During domestication of corn from teosinte, farmers chose plants with large sugary kernels leading to the sweet corn varieties that we see today.
C: Almost all organisms on the tree of life use RNA or DNA as the primary hereditary material, indicative of evolution from a shared ancestor.
D: The lack of intermediate “transition” forms found in the fossil record during the evolution of the vertebrate eye.
E: All of the above are evidence for evolution
E
A population of yellow jackets has two alleles, a and b, at the hat locus. There are 1000 individuals within the population including 232 individuals with an aa genotype, 500 individuals with an ab genotype, and 268 individuals with a bb genotype.
A. What is the genotype frequency of each genotype within this population? (aa, ab, and bb)
B. What is the allele frequency of the a and b alleles within this population?
C. What would be the expected genotype frequency of the ab genotype if the hat locus was in Hardy Weinberg Equilibrium?
A: 0.232 (aa), 0.5 (ab), 0.268 (bb)
B: 0.482 (a), 0.518 (b)
C: 0.5
True/False: Unlike hypotheses, theories are similar to facts in that there can be no contradictory evidence.
True
Which type of selection is the most common in natural populations?
A: Directional Selection
B: Stabilizing Selection
C: Disruptive Selection
D: Negative Frequency Dependent Selection
E: Positive Frequency Dependent Selection
B
Select ALL the typical consequences of genetic drift:
A: Increased genetic differentiation between populations
B: Fixation of alleles even in the absence of other evolutionary forces
C: Loss of rare allele from the population
D: Decreases in heterozygosity in the population
A, B, C, & D
Identical twins raised in different environments always have the same eye color. What is the heritability of eye color?
A: 0
B: 0.5
C: 2/3
D: 1
E: Too little information
D
Future Dr. Turco has decided to start a company focused on selling hamsters and there is the most demand for hamsters with adorable large ears. She wants to figure out the narrow-sense heritability of ear size and decides to use the Breeder’s equation (R = h^2s). The ear size in his initial population was 4 cm^2. She selects several hamsters to breed that have an average ear size of 10 cm^2. The resulting offspring from these breeding have an ear size of 5 cm^2. What is the narrow sense heritability of ear size?
1/6
True/False: Genetic drift causes evolution.
True
True/False: In a population that has two alleles at a single locus, the allele with a higher initial allele frequency is more likely to go to fixation through genetic drift.
True
True/False: Populations with lower genetic diversity likely have lower levels of genetic drift acting within them.
False
Prokaryotes are often difficult to classify into different species. Which species concept would allow researchers to distinguish different species of bacteria?
A: Sympatric speciation
B: Allopatric speciation
C: Biological species concept
D: Phylogenetic species concept
E: None of the above
D
A hermaphroditic species has a population that goes through a generation of exclusive inbreeding after a long history of outbreeding. What are the likely consequences? Choose all that apply.
A: The following generation likely has an excess of heterozygous genotypes at most loci.
B: The following generation likely shows evidence of inbreeding depression because more deleterious recessive alleles appear as homozygous genotypes.
C: The following generation likely has a population inbreeding coefficient (f) that is less than zero.
D: The following generation, the pedigree inbreeding coefficient (F) will increase.
B & D
True/False: Applying the biological species concept rather than the phylogenetic species concept will typically result in more diagnosed species.
False
True/False: Gene flow between two populations will cause the populations to have more similar allele frequencies and raises Fst.
False
