Bio 94 Week 4 Discussion Bacteria, Archaea, & Protists 17, 11

15. Genetic drift occurs in a population. Which of the following statements might be true? A. Genetic drift increased the population's fitness.

B. The population experiences a decrease in genetic variation. C. Genetic drift decreased the population's fitness. D. Any of the statements might be true

14. Why doesn't inbreeding, by itself, cause evolution? A. It increases homozygosity. B. It violates the Hardy-Weinberg assumptions.

C. It does not change the population's allele frequencies. D. It decreases the population's average fitness What is an important consequence of gene flow in natural

populations? A. Gene flow increases the mutation rate among sedentary organisms. B. Gene flow moves individuals from one habitat to

another on a seasonal basis. C. Gene flow tends to separate allele frequencies among populations. D. Gene flow tends to reduce genetic differences among populations.

The two key factors responsible for allopatric speciation are A. lack of gene flow and mutation

B. mutation and genetic drift. C. genetic isolation and genetic divergence. D. postzygotic isolation and morphological change

Although each of the following has a better chance of influencing gene frequencies in small populations than in large populations, which one most consistently requires a small population as a precondition for its occurrence?

A. mutation B. natural selection C. genetic drift

D. nonrandom mating Why are bacteria/archaea interesting?

What was the common ancestor of all species living today, prokaryotic or eukaryotic? Extremophiles

Microbiome Morphological Diversity Size

Shape Motility Cell-Wall Composition

Worksheet Metabolic Diversity

Phototrophs: from sunlight Chemotrophs: from chemicals Chemoorganotrophs: organic molecules Chemolithotrophs: inorganic molecules

Autotrophs: self-synthesized from simple molecules Heterotrophs: from molecules produced by

other organisms Protists Euglenoid

Protists are paraphyletic Origin of nuclear envelope,

mitochondrion, and chloroplast Worksheet

Haploid life cycle Diploid Life Cycle

Alternation of generations

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