Gene targeting:a
requires individuals that are homozygous for the knockout gene in every cell.
b. is usually studied in organisms in which the knockout gene is homozygous in only one cell
type.
c. involves the study of knockout genes in the embryo-derived stem cells of mice.
d. is a fairly rapid process since it is conducted entirely in vitro.
e. involves the excision of the target genes, which are then "knocked out."
B
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