Inglise keel unit 5 answers
(ii) ranges of two species, overlap/close together/AW;
no geographical barrier;
ref to behavioural/genetic/physiological/prezygotic barrier;
correct ref to named area of map; max 2
(b) ref to mate selection by size; ie large with large or small with small
ref to monogamy;
ref to intermediate sizes, at disadvantage/selected against/ora;
intermediate do not pass on alleles/ora;
suggested reason why intermediate at disadvantage/ora max 3
(c) female produces a lot of eggs;
selects male, that can store lots of eggs/has a large pouch/ora;
large males fertilise many eggs/ora;
chance of more offspring surviving;
or
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