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Amoeba Sisters Video Recap of Meiosis

Review the steps and significance of meiosis with this Amoeba Sisters video recap—learn about chromosome numbers, crossing over, and errors like nondisjunction, all while exploring how genetic variation is created in gametes.

Daniel Miller
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Amoeba Sisters Video Recap of Me/os/s1. The purpose of meiosis is to makegametes, also known as sperm and eggcells.Inhumans, yourbodycells have 46chromosomes. How many chromosomesare i n a sperm o r egg cellif,when theycome together to form a fertilized zygote,there are 46 chromosomes? Write thecorrectnumberof chromosomes next tothe spermandegg.2.Interphasemust occur once beforemeiosis can happen. (Same thing formitosis). What would happen ifinterphase didn't occur first?3. A cell that begins meiosis has 23chromosomes inherited from the mother(shown in green in the cartoon below)and 23 chromosomes inherited from thefather (shown i n blue in the cartoonbelow). In the process of meiosis,chromosomes begin to match up inhomologous pairs. How would you knowif two chromosomes werehomologous?they would be slmilann shape and sizef be cell wtHjidnt grow234. Crossing over is a very important eventi n Prophase I o f meiosis! What haooensduring crossing over and what is thesignificance?5. Meiosis does PMAT twice ! That6. Meiosis does not always occurwithout any difficulties. Describe whatoccurs duringnondisjunctionand theeffect on the resulting cells.Chromosomes might notseparate correctly and thisCrtr, eauxa gtnalk --------------------------means there is a prophase I and aprophase II. There is a metaphase Ianda metaphase II. Etc... If the cartoonbelow has chromosomes in the middleof the cell, how would you knowwhether it was in metaphase I ormetaphase II?in mclophnsc 1 chromosomes arolined up with homologous pairs andulinniuuiphMMrrETircTTiBMnHei J i illftj/i up tot tha mi<4rfl»fitrail _ _ _ _ _aerjmwrt*ot ehramen-OTHesaree x c h a n g e d , t h i s i s slanrfhaant _ _ _brcauso this crratr-s variation din parent geneiAmoeba Sisters LLC©All iVghts reserved
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Biology

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