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Seen ceeeee nce eT Amoeba Sisters Video Recap of Meiosis L. The purpose of meiosis is to make Bametes, also known as sperm and ege cells In humans, your body cells have 46 chromosomes How many chromosomes are in a sperm or egg cell #f, when they come together to form afertilized zygote, there are 46 chromosomes? Write the correct number of chromosomes next to the sperm and egg. 2. Interphase must occur once before meiosis can happen. (Same thing for mitosis). What would happen if interphase didn't occur first? then the spindles wouldn't be ready. the A in HI might not be fully grown and ready yet. 3. A cell that begins meiosis has 23 chromosomes inherited from the mother (shown in green in the cartoon below) and 23 chromosomes inherited from the father (shown in blue in the cartoon below). In the process of meiosis, chromosomes begin to match up in homologous pairs How would you know if two chromosomes were homologous? well homo means same. so | can deduce that the two cells would have the same function. This is confirmed by the fact that in the image, it's labeled that there are two eye color genes Gene For rk 4. Crossing over is avery important event in Prophase | of meiosis! What happens during crossing over and what isthe significance? The significance of crossing over |s to create genetic diversity. This is was ensures that 3 brothers don't look identical. It happens post sexual reproduction. 5, Meiosis does PMAT twice! That means there is a prophase | anda prophase IL There is a metaphase | and a metaphase IL Etc__ If the cartoon below has chromosomes in the middle of the cell, how would you know whether it was in metaphase | or metaphase Il? Bue to the two sets of chromosomes in Metaphase, | know that this is probably Metaphase Il 6, Meiosis does not always occur without any difficulties Describe what occurs during nondisjunction and the effect on the resulting cells Nondisjunction is when something goes wrong. It typically means that cells would have eithe one extra chromosome, or is short one chromosome. Having an extra is what leads to down syndrome. Amoeba Sisters LLC All rights reserved 
