heterotypical chromosome


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het·er·o·typ·i·cal chro·mo·some

chromosome that pairs with an unequal partner, for example, the X and Y chromosomes.

al·lo·some

(al'ō-sōm)
One of the chromosomes differing in appearance or behavior from the autosomes and sometimes unequally distributed among the germ cells.
Synonym(s): heterochromosome, heterotypical chromosome.
[allo- + G. sōma, body]