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Unformatted text preview: / might result in two distinct forms of the species (→morphs) Reasons for a high incidence of a (dominant) rare
disease/allele in a population [EXAM] Allele frequency stays constant due to
Common ancestor/no migration/genetic isolation/small gene pool/in-breeding
High probability of mating with person having the allele
Reproduction before symptoms of the disease are apparent
No survival/selective disadvantage (no elimination by natural selection) Speciation Splitting of one into more species/transformation of one into a new species over time
Emigration/immigration moves alleles between populations
Changes allele frequency by genetic variation in meiosis Reproductive Isolation Mechanisms
Premating Habitat isolation / populations inhibit different local habitants within one environment
Temporal isolation / same environment but are reproductively active at different times
Behavioural isolation / two populations have different courtship patterns Geographical separation / populations inhabi...
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This document was uploaded on 02/28/2014 for the course BLG 144 at Ryerson.
- Summer '10