the grouping of human chromosomes is based on
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Human karyotype - set of 46 chromosomes (number – species specific characteristic)
22 homologous pairs of autosomes and 1 pair of sex chromosomes
arranged and numbered according to the chromosome size and type (centromere position) and banding pattern into homologous pairs and seven chromosome groups
Group A (1-3) – large metacentric chromosomes (but chr. 2 – submetacentric)
Group B (4-5) – large submetacentric
Group C (6-12, X) – medium-sized submetacentric
Group D (13-15) – medium-sized acrocentric
Group E (16-18) – short submetacentric
Group F (19-20) – short metacentric
Group G (21-22, Y) – short acrocentric (but chr. Y – submetacentric)
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