JOIN OUR WHATSAPP GROUP. CLICK HERE

Abnormal meiosis Grade 12 Life Sciences Notes with Activities Questions and Answers

Abnormal meiosis Grade 12 Life Sciences Notes with Activities Questions and Answers Abnormal meiosis Grade 12 Life Sciences Notes under Meiosis can be found on this page and offers review activities with questions and answers to aid students in grade 12 in getting ready for quizzes and exams.

Notes

Sometimes mistakes occur during the process of meiosis.

• This can happen in Anaphase 1 where the homologous chromosomes may not separate. Also called non-disjunction.
• It can also happen in Anaphase 2 when there is non-disjunction of the sister chromatids.
• If there is non-disjunction of chromosome pair 21 in humans it leads to the formation of an abnormal gamete with an extra copy of chromosome 21.
• If there is fusion between a normal gamete and an abnormal gamete (with extra copy of chromosome 21) it leads to Down Syndrome.

If meiosis does not occur properly, an egg or sperm could end up with too many chromosomes, or not enough chromosomes.

Video Lesson on Abnormal meiosis

PDF Downloadable Notes on Abnormal meiosis:

Question and Answers Activities:

Find short and long questions for Grade 12 Life Sciences, which will help you to prepare for the exams, tests, practical tasks, and assignments.

 JOIN OUR TELEGRAM CHANNEL. CLICK HERE