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 __________ .

genetic drift
assortative mating
heterosis
inbreeding

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Recombinant DNA Technology
An expression vector

always contains an origin of replication
always contains DNA segments for the regulation of mRNA production
usually contains a gene that confers antibiotic resistance to the bacterial host
All of these

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Recombinant DNA Technology
The order for the construction of a cDNA fragment from mRNA is to

digest with RNase, add G residues to the 3' end, treat with reverse transcriptase, add G residues to the 3' end and treat with DNA polymerase
treat with reverse transcriptase, digest with RNase, add G residues to the 3' end, bind oligo-dC, treat with DNA polymerase and bind oligo-dT
bind oligo-dT, treat with reverse transcriptase, digest with RNase, add G residues to the 3' end, bind oligo-dC, treat with DNA polymerase
bind oligo-dC, treat with reverse transcriptase, digest with RNase, add G residues to the 3' end, bind oligo-dT and treat with DNA polymerase

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