Multiple-copy genes

OPs Myzus persicae Resistant clones (85-315) Enhanced B esterase Multiple copies of gene... 

Metabolic resistance may be the consequence of the appearance of a novel gene on the resistant strain, which is not present in the general population it may also be due to the presence of multiple copies of a gene in different strains or clones as in the example of OP resistance in the peach potato aphid mentioned earlier. 

Alex Rosenberg. Are you talking about multiple copies, or genes that differ in sequence but have the same function ... 

Intact factor VIII, as usually purified from the blood, consists of two distinct gene products factor VIII and (multiple copies of) von Willebrand s factor (vWF Figure 12.6). This complex displays a molecular mass ranging from 1 to 2 MDa, of which up to 15 per cent is carbohydrate. The fully intact factor VIII complex is required to enhance the rate of activation of factor IX of the intrinsic system. 

Library A collection of antibodies, usually Fab or scFv fragments, in the range of 106 to 1010 and displayed on the surface of bacteriophage whose DNA gene contains a DNA sequence capable of expression as the antibody protein. Thus, identification of a single member of the library by selection can be used to generate multiple copies of the phage and sizeable amounts of the antibody protein. 

Gene amplification 1 Many oncogenes are present in multiple copies erbB amplified in certain breast cancers Dihydrofolate reductase genes are amplified in some tumors, leading to drug resistance... 

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