Today in class we talked about the similarities and differences between the process of mitosis and meiosis.
Mitosis
-trying to split chromosomes
-end up with 2 cells
-cells are body cells
-asexual
-body cell-growth and repair
Meiosis
-more steps
-meiosis1 spindle fibers connect to one side of chromosome
-happens because we're splitting homologus pairs
-end up with 4 cells
-cells are gametes
-gametes {sex cells}
-sexual
-2 divisions which gets you 4 cells
-crossing over occurs between homologus pairs
Similarities
-DNA and chromosomes
- meiosis 2 is similar to mitosis {splits chromosomes}
- cell division
-utilize centreols
-envolve eukaryotes
-X shaped chromosomes
Notes
-The point of meiosis is to make a new sperm and egg.
-Girls finish meiosis before we are born and don't go through it again
-Meiosis is in the overes
-For boys it starts at 10-13 and they go through it until they are about 70
-It's in the testies for boys
-Meiosis can happen without having a child present
Mitosis
-trying to split chromosomes
-end up with 2 cells
-cells are body cells
-asexual
-body cell-growth and repair
Meiosis
-more steps
-meiosis1 spindle fibers connect to one side of chromosome
-happens because we're splitting homologus pairs
-end up with 4 cells
-cells are gametes
-gametes {sex cells}
-sexual
-2 divisions which gets you 4 cells
-crossing over occurs between homologus pairs
Similarities
-DNA and chromosomes
- meiosis 2 is similar to mitosis {splits chromosomes}
- cell division
-utilize centreols
-envolve eukaryotes
-X shaped chromosomes
Notes
-The point of meiosis is to make a new sperm and egg.
-Girls finish meiosis before we are born and don't go through it again
-Meiosis is in the overes
-For boys it starts at 10-13 and they go through it until they are about 70
-It's in the testies for boys
-Meiosis can happen without having a child present
Crossing Over
Crossing Over is when 2 chromosomes split and take a piece of each other (about a quater) the homologus pairs connect and form a tetrad.This happens in prophase 1. A tetrad is a group of chromotids.
-Allie Mansfield 4th time<3
-Allie Mansfield 4th time<3
Also, for the girls since they never do it again they use it until they run out which usually happens when your around 50-60 years old.
ReplyDelete-Matt Timpone Period 4
HEYY! using the example from class just to claify, that when crossing over occurs, one "arm" of each chromosome is ripped off of their body, and put on the other chromosome. So both chromosomes have an arm of each other in them!
ReplyDelete-Caroline S.
Great Blog! Very detailed!! I just have one question though-
ReplyDeleteWhen you made your list for Meiosis and said "cells are gametes" are you refering the gametes as sperm and egg? I just want to make sure I'm not confused about a gamete.
Im pretty sure a gamete is a type of sex cell.Correct me if im wrong...
Also we need to have crossing over because it makes you different from other people. Also if there was NO crossing over(***GASPP***) disease would spread and whipe out the human race. and if there was no crossing over we would all have-lets say-brown eyes and brown hair. Then if a disease spreads to all brown eyed/haired people-we would all be sick because we would all have brown eyes and brown hair!
Luckily we have crossing over so we are all different. so only some people with brown hair and eyes will get disease and not the whole human race!
thank god we have crossing over!
Claudia <3333