to follow the fate of chromosomal arms through the segregation process , our hybrids were also heterozygous at the mtx ( methotrexate resistance ) locus on the short arm of chromosome 2 and carried cytogenetically marked chromosomes with either a short-arm deletion ( 2p- ) or a long-arm addition ( 2q+ ) .
C0449721
of chromosomal arms
C0008633
chromosomes