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You need to look up polytene (giant) chromosomes. Polytene chromosomes are over-sized chromosomes which have developed from standard chromosomes and are commonly found in the salivary glands of Drosophila melanogaster. Specialized cells undergo repeated rounds of DNA replication without cell division (endomitosis), to increase cell volume, forming a ...


The thing we must remember is that during evolution, there occurs many events that may result in genomic reshuffling. Considering your example of MHC, when we look into the evolution of the complexes The classical human MHC contains 224 genes, .... Antibody and T cell mediated immune responses against invading pathogens are initiated through MHC class ...

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