A female mouse with 40 chromosomes and 41 arms was detected by chromosome analysis of progeny from T171665Dn mice. This mouse had a unique biarmed chromosome that appeared to be the result of a fusion between chromosome 12 and the marker chromosome T(1716)65Dn.
Legend:
cx: complex: > 1 genome feature ot: other: hemizygous, indeterminate,... (F): Female
(M): Male
N: normal phenotype
(#): related diseases count