Meiosis

Cardinal Notes RIGHT Topic/Objective: Essential Question: Meiosis Name: Class: Biology Date: Questions: Breakout #1 Watch the video and answer the questions below Pause at 20 seconds 1. What is a female gamete called? __________________ 2. What is a male gamete called? ___________________ 3. If humans have 46 chromosomes in their body cells, how many do they have in their gamete (sex) cells? ___________ Pause at 32 seconds 4. What is the term for a fertilized egg? ___________________ Pause at 46 seconds 5. What type of cell division produces gametes? _________________ NOTE: Germ cell precursor is the same as the parent cell!!! 6. How many gametes are produced during meiosis? ________ Pause at 1:29 minutes 7. True or False: DNA replication happens in Meiosis. Pause at 1:36 minutes 8. What are sister chromatids? Pause at 1:47 NOTE!! A bivalent is the same as a TETRAD! 9. How many chromatids are in a tetrad (bivalent)? __________________ 10. Draw a tetrad below. Use two colors: one color for mom and one color Right - Page
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for dad. Pause at 2:04 minutes NOTE: Recombination is the same as Crossing Over!! 11. What is the major source of genetic variation? ____________________ ____________________ 12. Draw crossing over using your tetrad from question #10). Pause at 2:31 minutes 13. At the end of Meiosis I (in a human) how many chromosomes are present? ____________________ 14. At the end of Meiosis II (in a human) how many chromosomes are present? ____________________ 15. Meiosis II occurs (with or without (circle one)) DNA replication. Pause at 2:40 minutes 16. Due to recombination (crossing over), each gamete will be ________________________ different from the others. Breakout #2 Breakout #3 Meiosis What? •
______________________ o Cell division that produces gametes containing ___________ the number of _________________________________as a parent cell that are all ___________________________________ ________________________________ o Occurs in specialized cells that produce __________________ §
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Gamete – •
_______________sex cells (________________) •
______________ sex cells (________________) Meiosis I: Meiosis II: Important Meiosis Vocabulary:
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________________________________Chromosomes: o Chromosomes that contain the same _____________________ o One homologous chromosome is inherited from the organism's _________________________, the other from the ________________________ §
Tetrad: o Each pair of ________________________________chromosomes come together o Consists of ___________homologous chromosomes , each made of 2 sister _______________________________ (______________________________________) o Tetra=____________ §
Crossing over: o Tetrads pair so tightly some genetic information is actually ____________________________________, called ____________________________ ______________________ o Average of _____________________________ crossovers on every Right - Page
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homologous chromosomes Comparing Meiosis and Mitosis Similarities §
_______________________________________only ___________________ §
Both start with _______________ ________________________ §
Both have ___________________________________ ___________ ________________________________ §
Both produce __________ __________________ Differences §
Mitosisà __________________________________________cells Meiosisà _____________________________________________________cells §
In mitosis, chromosome # is __________________________________ In meiosis, chromosome # _____________________________ §
Mitosis has only _________________________________________________ Meiosis has _____________________________________ Breakout #4 Summary:
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