Can anyone help explain the zygotic life cycle, the sporic life cycle, and the gametic lifecycle in simpler terms, as well as the differences and similarities? I don't get it.
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all eukaryotic organisms have a certain number of chromosomes, referred to as n. Organisms make a duplicate of each chromosome (because they are so important), so the chromosome count is up to 2n. If these organisms reproduce sexually, they have to get that number back to n, so the offspring will be at 2n instead of 4n.
the part of a life cycle where the individual is n is called the "gametic" part of the life cycle. The part where the individual is 2n is called the "sporic" part. When 2 gametes fuse (n-->2n) that is zygotic.
Organisms like us spend almost all of our life in the sporic part. We personally are never gametic, we make cells (sperm and egg) that act as our gametes. Other life forms (like mosses) spend a good part of their life cycle in each part.