What will happen to dna sequence variation in the regions of the genome immediately adjacent to an allele undergoing a selective sweep, or strong positive selection? group of answer choices increased variation and the absence of linkage disequilibrium at nearby sites no change in local genetic variation decreased variation and the absence of linkage disequilibrium at nearby sites decreased variation and high levels of linkage disequilibrium at nearby sites increased variation and high levels of linkage disequilibrium at nearby sites

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.