When the dna fails to separate correctly during meiosis, gametes with extra or missing chromosomes may be formed. this is called?

Nondisjunction

DNA replication duplicates every strand of DNA so that there are two copies of every chromosome. These (attached) copies, called sister chromatids, undergo two rounds of chromosomal divisions ( Meiosis I and II). A total of four haploid cells are now present. Homologous chromosomes or sister chromatids are pulled apart in a process called disjunction. However, chromosomes may at times fail to separate properly. This is called nondisjunction.

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but there is no

i guess you forgot putting it.