BSC 2011C Chapter Notes - Chapter 24: Species Problem, Reproductive Isolation, Species Complex

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24 May 2016

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Microevolution changes over time in allele frequencies in a population. Macroevolution broad pattern of evolution above the species level. Concept 24. 1: biological species concept emphasizes reproductive isolation: biological species concept primary definition of species a. i. Species group of populations whose members have potential to interbreed in nature and produce viable fertile offspring a. i. 1. Don"t produce viable, fertile offspring with members of other such groups a. ii. Emphasizes the separation of species from one another due to reproductive barriers: reproductive isolation existence of biological factors that impede members of two species from interbreeding and producing viable, fertile offspring b. i. Barriers block gene flow and limit formation of hybrids (offspring that result from an interspecific mating) b. iii. Prezygotic barriers block fertilization from occurring b. iii. 1. Impeding members of different species from attempting to mate b. iii. 2. Preventing an attempted mating from being completed successfully b. iii. 3. Hindering fertilization if mating is completed successfully b. iv.

Related Questions

Random, chance events that change allele frequencies are knownas:

A. Gene flow

B. Genetic drift

C. Natural selection

D. Balancing selection

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Question 21 pts

What type of selection acts to maintain the two extremephenotypic variants in a population?

A. Disruptive selection

B. Directional selection

C. Positive selection

D. Artificial selection

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Question 31 pts

Approximately, how much of our DNA is shared with our closestrelatives, chimpanzees?

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Question 41 pts

The large canines of male baboons are likely the result of________, while the fact that some male baboons are very colorfulis probably the result of _______.

A. Mutation; balancing selection

B. Gene flow; sexual dimorphism

C. Male competition; female choice

D. Mate choice; genetic drift

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Question 51 pts

Negative assortative mating results in an increased frequency ofhomozygous genotypes within a population.

True

False

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Question 61 pts

Genetic evidence suggests that humans and Neandertals neverinterbred.

True

False

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Question 71 pts

The specific variant of the FOXP2 gene associated with languageacquisition in humans is found in both humans and Neandertals.

True

False

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Question 81 pts

Industrial melanism describes the change in moth color from paleto dark after pollution from factories resulted in coating treetrunks with a layer of dark soot. Which statement is trueconcerning industrial melanism?

A. After pollution levels increased, all moths became darkercolored because soot got on their wings

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C. Individual moths changed their color in response to thepollution

D. Dark moths were present in the population before pollutionlevels increased

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Question 91 pts

Patterns of evolution can be seen above the species level

True

False

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Question 101 pts

Inbreeding is problematic because it increases the probabilitythat offspring inherit two copies of a recessive mutation thatcauses disease.