1)option D is the correct answer.Codominant expression occurs when two different alleles are inherited at the same genetic location and the products of both of the alleles are expressed.Polygenic traits are controlled by more than one gene.The MHC genes are highly polymorphic,ie there are many different alleles in the different individuals inside a population.The MHC molecules have broad specificity,because they can bind many types of possible peptides,so the cells present more diverse peptides.The genes encoding the major histocmpatibility molecules play an importanat role in the induction of immune responses.This polymorphism is due to selection for increased protection of hosts against pathogens.
2)optio D is the correct answer.Antibody diversity is the phenomenon of immense variability characteristics of antibodies,which enables the immune system to react specifically against the unlimited kinds of antigens it encounters.After repeated exposure by antigens,antibodies are generated by B cells that bind their antigen with much higher affinity through the process called affinity maturation.Antigen stimulation greatly increases the antibody arsenal.It may causes deletion and addition of nucleotides which result in the shift of the reading frame of the coding sequence.
Codominant expression of polygenic and polymorphic MHC genes allows: O your cells to present more diverse...
This pathway to complement activation can be initiated by several different signals including the properdin/factor P activation pathway The classical pathway The alternative pathway Lectin pathway All of the above The mechanism that permits Ig to be synthesized in either a membrane-bound or secreted form is: Allelic exclusion Codominant expression The one-turn/two-turn joining rule Differential RNA processing Which of the following allows for recombination in the V(D)J coding regions? IL-2b TdT RAG-½ All of the above Generation of combinatorial diversity...