BIO 322 PATHO FINAL EXAM NEWEST 2025 ACTUAL

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BIO 322 PATHO FINAL EXAM NEWEST 2025 ACTUAL

EXAM COMPLETE 100 QUESTIONS AND CORRECT

DETAILED ANSWERS (VERIFIED ANSWERS )

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If genetic drift is principal, or only, evolutionary process affecting allele frequencies at a gene locus, then which of the following is true?

• Large populations maintain more genetic variation than small

ones

• all of these are true
• Large populations generate more genetic variation than small

ones

• Mutations drift toward fixation more slowly in large

populations

• Substitutions occur at the same rate in populations of all sizes

**FIND A** - ANSWER-D

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Assume that a bird species living in the southwest US shows an Fst value of 0.1 between southern California and Arizona with a barrier provided by the Mojave Desert. As climate change progresses, increased desertification of the environment reduces the rate of migration between CA and AZ as interbreeding

declines:

• Cannot be determined from the info given
• FST will be unchanged after several generations
• Fst will increase towards 1 after several generations
• Fst values are irrelevant to issues of migration
• Fst will decline towards 0 after several generations -

ANSWER-C

Which of the following is nota hypothesized advantage of sexual reproduction?

• It reduces the chances of producing defective offspring
• It increases resistance to parasites
• It helps remove deleterious genes
• It recombines different advantageous alleles and separates
• It creates genetic variation - ANSWER-A 2 / 4

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Which of the following statements is true?

• Random mating in large populations will cause random

fluctuations in the rate of heterozygosity lost in populations

• Genetic drift varies in direct proportion to populations size
• Positive assortative mating has the same effects on genetic

diversity in populations as does frequency dependent selection and heterosis

• Migration increases genetic variation between populations

and has no effect on genetic diversity within populations

• Inbreeding is similar to genetic drift in that both process lead

to a predictable rate of loss heterozygosity in populations -

ANSWER-B

Which trait is most likely a product of sexual selection by female choice?

• Barbs on the penis remove the sperm of rival males and

increase probability of fertilization

• Bright coloration on a fish that is indicative of genetic quality 3 / 4

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• Satellite male behavior by horseshoe crabs, in which an

unmated male piggybacks onto a mating pair in the hopes of fertilizing at least a few eggs

• Stronger antlers on an elk that improves an individual's

chances in combat

• Successful bedbugs with the ability to overcome the female's

resistance to mating - ANSWER-B

Consider a hypothetical locus with several segregating alleles.The populations size is small, mutation is absent, and none of the alleles has a selective advantage. Which of the following is likely to occur after a long period of time (many generations)?

• Allele frequencies will change over time, but all alleles will

remain

• Genetic variation will decline as alleles randomly go extinct
• Allele frequencies will cycle over time
• Balancing selection will maintain all the alleles
• Allele frequencies will remain constant - ANSWER-B

The effective population size, Ne , represents an idealized, hermaphrodite, randomly mating population that

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