BIO120H1 Lecture 20: lecture 20.docx

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azureotter600

18 Apr 2012

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How many genes are involved in reproductive isolation (speciation genes) Reason is like in humans, we don"t say that because of looks that we have more than 1 species of us. Biological is based on inter fertility (exception is asexual). Secondary contact if the barrier is removed, and now no longer can reproduce. Typically there should be gene flow stopping there divergence. Relatively small cases in which it occurs. Preventing of zygote by geographical ecological, temporal behavioral, mechanical or prevention of gamete fusion. Inviability, sterility, abnormal development of newborns and as a result there easy target. Animals specialized to feed on it. humans brought in apple orchards. Host shift, fly no (apple and hawthorne in same family). Monkey flowers are pollinated by bumble bee and hummingbird. At low evelation, and high areas have to pollinators in each latitude. When brought into green house they can be cross bread.

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Because biological species are defined in terms of reproductive compatibility,the formation of a new species hinges on reproductive isolation- the existance of biological factors(barriers) that impede members of two species from interbreeding and producing viable, fertile offspring. List and discuss the prezygotic barriers that impede mating or hinder fertilization if mating does occur. Make sure you include examples of each.

viridianraccoon618

Which of the following statements best explains the process of allopatric speciation?

Genetic differences accumulate between populations that are isolated by a geographic barrier, eventually leading to reproductive isolation.

Genetic differences accumulate through recombination between populations that are interbreeding, eventually leading to reproductive isolation.

Genetic differences accumulate in a population through selective mate choice, leading to two groups that breed independently, causing reproductive isolation.

Two populations in the same geographical area accumulate genetic differences by random chance, eventually leading to reproductive isolation.

Genetic changes within a population as the result of genetic drift influences traits involved with mate choice, eventually leading to reproductive isolation.

What is the basic difference between allopatric and sympatric modes of speciation?

Sympatric speciation takes place between populations that migrate away from each other.

Sympatric speciation takes place between populations in the same geographic area.

Allopatric speciation takes place between populations in the same geographic area.

Sympatric speciation takes place over long periods of time; allopatric speciation occurs within a single generation.

Allopatric speciation is thought to occur much less frequently than sympatric speciation.

sangriaswan287

Compare allopatric speciation and sympatric speciation. In youranswer, use the terms: allele frequencies, mutations, selectionpressures, geographical barriers, and reproductive isolation.

rosepig378

BIO120H1 Lecture 20: lecture 20.docx

BIO120H1 Full Course Notes

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