-Crossing over occurs between prophase 1 and metaphase 1 and is the process where homologous chromosomes pair up with each other and exchange different segments of their genetic material to form recombinant chromosomes. It can also happen during mitotic division, which may result in loss of heterozygosity.
Meiosis is when a sperm and egg join together to reproduce another organism. We need meiosis to reproduce more organisms
The strands are suppose to be exactly same when replication is complete, so you would not be able to tell the difference.
Saturated fats because if you eat too much it could result in illness, I believe.