3.2

Question 1

How has … evolved by natural selection?

Answer 1

How has … evolved by natural selection? Variation in … caused by mutation; organisms that … attract more/ have a survival advantage, so more likely to survive, therefore pass on alleles to offspring
… acts as selection pression, random mutation in gene for …, this organism has survival adv bc …, more likely to reproduce passing on new allele, allele freq increases in popln

Question 2

Dif bw allopatric and sympatric

Answer 2

both = reproductive isolation, absence of gene flow but A = geographic isolation, S = dif food/behavioural/anatomical/physiological/seasonal/temporal isolation