Aneuploidy is the presence of an abnormal number of chromosomes in a cell, for example a human cell having 45 or 47 chromosomes instead of the usual 46. It does not include a difference of one or more complete sets of chromosomes, which is called euploidy.
Chromosome number among the larger sunfishes is conserved. Problem is loci distributions are not. During gamete formation the mismating can break some chromosomes and make others larger. Net effect is so copies of loci lost or gained and in a hybrid that can be accompanied by big chunks of chromosomes. Some of the changes are fusions of chromosomes, splitting of chromosomes, additions and outright losses.
Aquaculture Cooperative Research / Extension Lincoln University of Missouri
