During meiosis, when chromosomes that were crossing over do not separate, and both migrate to the same cell, resulting in a germ cell with an extra chromosome, this is referred to as:

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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate during meiosis, leading to an abnormal number of chromosomes in the resulting germ cells. This can occur during either meiosis I or II and often leads to genetic disorders such as Down syndrome. Chiasmata refers to the points of crossing over between homologous chromosomes during meiosis. Translation refers to the process by which genetic information in mRNA is used to synthesize proteins, and alleles are variations of genes that can lead to different traits.

During Meiosis, When Chromosomes That Were Crossing Over Do Not