Postulates of Natural Selection:
1. Individual Variation - Organisms in a population will vary from one another in different characteristics.
2. Heritability - The traits of an organism are inherited from both of its parents.
Which statement about natural selection is true?
a) Changes in allele frequencies can occur only because of natural selection.
b) It always results in reduced genetic variation.
c) It can have an evolutionary effect only if phenotypic differences are heritable.
d) It acts directly on genotypes.
e) It is the same as evolution.
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