the failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during nuclear division
A gene that is phenotypically expressed in the homozygous state but has its expression masked in the presence of a dominant gene.
A gene that is expressed phenotypically in heterozygous or homozygous individuals.
one of the cells that take part in the formation of the body, becoming differentiated into the various tissues, organs, etc.
the sexual reproductive cell at any stage from the primordial cell to the mature gamete.
the chromosomes of a cell, usually displayed as a systematized arrangement of chromosome pairs in descending order of size.
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