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BIOC51H3 (51)
Lecture 19

BGYB51H3 Lecture 19 Notes Nov 12

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Biological Sciences
Maydianne Andrade

BGYB51H3 Lecture 1819 Notes -host race is a subgroup that specializes on a particular host or have habitat requirements -the specialization evolved due to selection -variation in emergence time in hawthorn flies, which can lead to speciation -disruptive selection occurs in apple and hawthorn flies in which hawthorns that emerge between both peak periods do less well than other hawthorns -flies show strong preference for one fruit type -incipient species are populations that have diverged but are not isolated, which indicates there is some gene flow -a difference in colour can be caused by a single nucleotide substitution in a gene regulating melanin -if one population occupies a niche, selection leads to adaptation to that niche and new environment, causing divergence -sexual selection concentrates on the phenotypic variation among i
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