Learn.Genetics at Utah is an excellent resource for this topic, and all animations are easy enough to save.
Meiosis:
Good animation from Biostudio
Simple animation from Lewison-Porter Central School District
Good animation from Learn.Genetics
Non-disjunction:
Trisomy from Learn.Genetics (their page on Down Syndrome is here)
Excellent animation of meisosis I and meiosis II from BioStudio
Karyotyping:
Animation and have-a-go from Learn.Genetics
Amniocentesis:
Simple animation from MedIndia
Video from GoogleVideo
Here’s a patient having an amnio:
Chorionic Villus Sampling:
Video clip from Discovery Human Body Atlas
Filed under: cells
