Recombinant DNA Technology
When populations are small, gene frequencies can change from generation to generation and some alleles may become fixed in a population. This is called __________ .

inbreeding
genetic drift
assortative mating
heterosis

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Recombinant DNA Technology
Knockout mice are created by

infecting the mouse with a retrovirus
creating a chimera by fusing cells from two different cell lines
transfecting embryonic stem cells with an altered gene sequence
mutagenizing a mouse and selecting for mutant offspring

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