The males are genetically identical to their mothers except that they have one less sex chromosome.
The platypus has 10 sex chromosomes instead of the normal 2.
On sex chromosomes, the amount of clusters is very low in both human and mouse.
The reason for this association is not known: no linkage has been found to genes on the sex chromosomes.
The 0 denotes the absence of a second sex chromosome.
They may be caused by genes on either autosomal or sex chromosomes.
The human sex chromosomes are a typical pair of allosomes.
One is the inheritance of traits carried by the sex chromosomes.
Most mammals have only one pair of sex chromosomes in each cell.
