Can anyone help me about this topic, because i wasn't in class today and the teacher gave a huge homework that will count as half of the grades this period.

 

Your explanations are welcome

I only know the abormality for 21 and 23

If you are acquainted with the concept of aneuploidy, it will help you with at least one of those questions.  Bonne chance avec tes etudes!

Merci, pour le conseil sur l'aneuploidie . Thank you very much this helps me  

43 minutes ago, TheVat said:

If you are acquainted with the concept of aneuploidy, it will help you with at least one of those questions.  Bonne chance avec tes etudes!

Also, do you know a website where i can search things like gonosomes, etc?

I suggest that you take a look at the syllabus for your course. Typically there will be textbook recommendations. If the recommended books are not online/open source, you might be able to get them from your library. More often than not, lectures are structured around a couple of textbooks so you can easily read up on the topics. 

In fact, the original intention of lectures was that students first read the textbooks and then use the lectures to deepen/apply the knowledge and to get guidance into context.