Brey-Lecture 5

Brey-Lecture 5 - Sympatric speciation formation of a new...

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Unformatted text preview: Sympatric speciation formation of a new species without a geographic barrier Polyploidy (in plants) happens because can self-fertilize Shift in most specialization ecological isolation reproductive isolation o In habitat had hawthorn plant apple maggot fly o Introduction of apple tree fly on hawthorne shifted to apple Population shifted to apple created ecological barrier one population stayed on hawthorne one on apple o Fly mating became non-random based on habitat preference o Genetic differences accumulate Allele frequency change and mutated o One population becomes two populations Polyploidy instantaneous speciation via spontaneous increase in chromosome number (haploid, diploid, polyploidy) o Mostly occurs in plants but can occur in animals o Plants can self fertilize why we theorize plants form two different species o Horse + donkey = mule One had 31 one had 32 chromosomes (63 in total causes meiosis to fail) No hybridization or homologous chromosomes o Allopoyploidy Hybridization followed by polyploidy...
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Brey-Lecture 5 - Sympatric speciation formation of a new...

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