IB Biology HL A4.1.7 Reproductive isolation Question Bank

a. speciation is a new species forming from an existing species/splitting of a species;

b. speciation depends on reproductive isolation/no interbreeding between populations;

c. gene pools of populations are separate/no gene flow between populations;

d. temporal isolation if two populations breed at different times/valid example;

e. behavioral isolation if breeding prevented by differences in behaviour/valid example;

f. geographical isolation if populations live in different areas / are separated by a physical barrier/valid example;

g. differences in mutations/genetic drift between isolated populations;

h. differences between environments cause different selection pressures/natural selection;

i. allele frequencies of isolated populations diverge;

j. evolutionary divergence/different evolutionary paths/different adaptation;

k. populations have become separate species when they are too different for successful interbreeding/for interbreeding to produce fertile offspring

OR

polyploidy can cause (instant) reproductive isolation;

7 max