Question

think it over 13. define what happens during nondisjunction?

Explanation:

Nondisjunction is an event in cell division (meiosis or mitosis) where homologous chromosomes or sister chromatids fail to separate properly. In meiosis, this can occur in Anaphase I (homologous chromosomes don't separate) or Anaphase II (sister chromatids don't separate). This leads to gametes (in meiosis) or daughter cells (in mitosis) with an abnormal number of chromosomes (aneuploidy), such as having one extra or one missing chromosome.

Answer:

During nondisjunction, homologous chromosomes (in meiosis I) or sister chromatids (in meiosis II or mitosis) fail to separate correctly during cell division. This results in daughter cells (or gametes) with an abnormal number of chromosomes (aneuploidy), as some cells receive an extra chromosome and others receive one fewer than the normal amount.