Most variation between individual humans is in the form of ______________________. One of the basic types of genetic change called _________________________ may arise by recombination within introns and can create proteins with novel combinations of domains. Scientists and government regulators must be very careful when introducing herbicide-resistant transgenic corn plants into the environment, because if resistant weeds arise from __________________ then the herbicides could become useless. Families of related genes can arise from a single ancestral copy by _________________________and subsequent ________________________.
divergence purifying selection
exon shuffling single-
gene duplication synteny
horizontal gene transfer unequal crossing-over
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