| http://www.w3.org/ns/prov#value | - Mutation ??? ??? ??? Natural selection can only occur in a population when there are ______. differences in forms of heritable traits. ??? ??? ??? Directional selection ________. shifts allele frequencies in one direction only. ??? ??? ??? Disruptive selection __________. does not favor intermediate forms of a triat. ??? ??? ??? Sexual selection, such as competition between males for access to fer
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