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The chicken genome is relatively poorly studied at the molecular level. The karyotype 2n=78 is divided into three main chromosomal sub-groups: the macrochromosomes (six pairs), the intermediate microchromosomes (four pairs) and the microchromosomes (29 pairs). Whilst the microchromosome group comprise only 25% of the DNA, increasing evidence is proving that this is disproportionate to their gene content...
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