1. is the manipulation of organisms or their parts to produce useful products.
A. Genetics
B. Biotechnology
C. Heredity
D. zoology

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A) Genetics

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.