IB Biology HL A4.1.6 Speciation By Splitting of Pre Existing Species Questions

Explain how isolation changes gene pools over time and identify population evidence for the formation of new species.

Exam points

Explain how isolation of a gene pool can lead to divergence and the formation of new species.
Describe how mutation, selection and time change populations after reproductive or geographic isolation.
Use population or allele-frequency data to identify evidence that speciation is occurring.

[Maximum number: 4]

The biological insights of Mendel and Darwin in the 19th century remain important to this day.

Outline the process of speciation.

All question bank results loaded

a	speciation is the splitting of a species «into two species»
b	reproductive isolation/lack of interbreeding
c	isolation due to geography/«reproductive» behavior/«reproductive» timing
d	polyploidy can cause isolation
e	gene pools separated
f	differences in/disruptive selection cause traits/gene pools to change/diverge
g	gradualism / speciation/changes accumulating over long periods
h	punctuated equilibrium / speciation/changes over a short time period