BI111 Chapter Notes - Chapter 70: Genetic Drift, Sub Pop, Binomial Nomenclature

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erincat118

23 Jan 2017

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Reproductive isolation drives evolution of new species. Group of organisms that are similar to each other but different from other groups. Biological species concept: orga(cid:374)is(cid:373)s are (cid:373)e(cid:373)(cid:271)ers of sa(cid:373)e spe(cid:272)ies if . Cannot produce viable & fertile offspring w/ other mem of other species. *if organisms from two sexually reproducing pop do not fulfil, then there pop are reproductively isolated = different species. Reproductive isolation: two organisms from diff pop cannot produce viable & fertile offspring. Organisms cannot reproduce b/c of barriers that prevent them from mating. Gamete can unite & form viable zygote, but post- zygotic cell division to second gen hybrid can fail. Hybrid: organisms from diff species mate & produce offspring. Example: female horse + male donkey = mule (viable but not fertile) Hybrid sterility: some situations, hybrids viable & reproduce, but offspring not viable or do not survive. Reduced hybrid viability: gamete form zygote that develops into organism, but organism weak to reach reproductive age.

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

B. The dark moths survived better after pollution levelsincreased because they were not poisoned by the pollutants

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.