a) How can habitat selection and sexual selection drive sympatric speciation?
b) What are hybrid zones and why can they be viewed as “natural laboratories” in which to study
speciation?
Solution
a)sympatric speciation is when a small population becomes a new species without geographic
separation due to reduced gene flow by factors like polyploidy, habitat differentiation, and sexual
selection.This type of speciation takes place in geographically overlapping populations.There is
no physical barrier, but still interruption of gene flow is there.
For example in fruit flies, food source (habitat selection) and apple maget fruit flies
Ex. Cichlids(Differ in coloration of breeding males). Mate choice based on male breeding
coloration is the main reproductive barrier that normally keeps these gene pools of these two
species separate.
b)Hybrid zones are regions in which members of different species meet and mate, producing
some offspring of mixed ancestry. Such regions are \"natural laboratories\" in which to study
speciation because scientists can directly observe factors that cause (or fail to cause)
reproductive isolation..
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a) How can habitat selection and sexual selection drive sympatric sp.pdf
1. a) How can habitat selection and sexual selection drive sympatric speciation?
b) What are hybrid zones and why can they be viewed as “natural laboratories” in which to study
speciation?
Solution
a)sympatric speciation is when a small population becomes a new species without geographic
separation due to reduced gene flow by factors like polyploidy, habitat differentiation, and sexual
selection.This type of speciation takes place in geographically overlapping populations.There is
no physical barrier, but still interruption of gene flow is there.
For example in fruit flies, food source (habitat selection) and apple maget fruit flies
Ex. Cichlids(Differ in coloration of breeding males). Mate choice based on male breeding
coloration is the main reproductive barrier that normally keeps these gene pools of these two
species separate.
b)Hybrid zones are regions in which members of different species meet and mate, producing
some offspring of mixed ancestry. Such regions are "natural laboratories" in which to study
speciation because scientists can directly observe factors that cause (or fail to cause)
reproductive isolation.
