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2) The act of producing offspring or multiplying by such production
3) All the people living at the same time or of approximately the same age
1) The branch of biology that studies heredity and variation in organisms
1) The alleles present in the genetic make up of an individual. e.g. the genotype of a human male is XY (the X and Y are alleles).
(Adapted from Edexcel GCSE SCience and Data Resource Book, UG005206)