Possible combinations in the Meiosis' Telophase 1
Failure to properly separate homologous chromosomes during meiosis, either by including an extra copy of a chromosome or including zero copies of a chromosome, causes gametes that are 'aneuploid', and as a result, a zygote that results from that gamete will have an extra or missing chromosome as well.

For humans, most aneuploidies are completely fatal at some point of early development, so there is not an associated genetic disorder in live births.

One common aneuploidy that is not fatal to the embryo is an extra copy of chromosome 21; this causes Down syndrome.