onion cells are plant cells, while human cheek cells are animal cells. the onion cells have the distinctive brick-like shape while the cheek cells are more round. this is a qualitative observation
One strand runs in the 5 to 3 and the other in the 3 to 5
Chromatin is loosely found DNA, it consists of DNA wrapped numerous amounts of protein, called Histones. This wrapping is what assists in DNA to fold and become more compact.
Hold on let me go do my research I’ll brb .
But an egg or sperm only has one. That one is chosen at random, through a process called meiosis. When meiosis messes up, you can end up with to many or too few chromosomes. One extra chromosome in a egg or sperm means three in the fertilized egg and so trisomy.