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Agenda Quiz Notes Whiteboards Meiosis Worksheet
Constructed response practice Exit slip
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Differences between mitosis and meiosis
MEIOSIS is for… MITOSIS is for… reproduction growth
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Key Point #1 When one sperm fertilizes one egg it forms a zygote. This zygote then grows into a full grown organism over time.
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½+ ½ = 1 A zygote gets HALF its chromosomes from mom and HALF from dad. 1. An egg has ½ the chromosomes of all body cells. 2. A sperm has ½ the chromosomes of all body cells 1/2 1/2 1
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What’s N got do with it? 2N 4N Haploid- Half the number of chromosomes
We call this “N” chromosomes If sex cells had 2N chromosomes like body cells, then babies would have 4N!!! 2N N 2N 4N 2N N
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Key Point #2 The process of making gametes (sex cells) is called meiosis. Meiosis produces four genetically different sex cells. End with FOUR sperm or egg cells Start with one cell Meiosis happens
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Meiosis produces gametes (sex cells)
sperm egg
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Meiosis produces genetically different daughter cells
Every sperm and egg are different. This is why siblings aren’t twins!
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Meiosis produces FOUR daughter cells
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Meiosis goes through cell division TWICE!!!!
IPMATC and then… PROPHASE II METAPHASE II ANAPHASE II TELOPHASE II CYTOKINESIS II
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Meiosis produces daughter cells with N chromosomes
Parent cell= 100 chromosomes (2N) Daughter cells= 50 chromosomes (N) ***Daughter doesn’t have to be a girl It just what scientists call the cells produced in mitosis/meiosis
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Let’s use humans as an example so we can understand the numbers better!
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mom dad 46 Original Cell Original Cell 46 46 23 23 23 23 23 23 23 23
YOU 23 46 Meiosis Sex Cells (Eggs) Meiosis Sex Cells (Sperm)
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Whiteboards
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Choices: meiosis OR mitosis
This process produces somatic cells
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Choices: meiosis OR mitosis
This process produces daughter cells that are EXACT genetic copies of the parent cell
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Choices: meiosis OR mitosis
This produces four daughter cells
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Choices: meiosis OR mitosis
Which process is responsible for this?
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Choices: meiosis OR mitosis
Which process is responsible for this? Drew Brees and his son
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Choices: meiosis OR mitosis
Which process is responsible for this?
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Tooooo easy, let’s make it harder!
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What phase?
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A cell has 24 chromosomes. How many daughter cells will be produced if it goes through mitosis?
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How many chromosomes will each of the TWO daughter cells have?
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A cell has 50 chromosomes. If it undergoes meiosis, how many daughter cells will be produces?
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How many chromosomes will EACH of the FOUR daughter cells have?
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A cell has 20 pairs of chromosomes
A cell has 20 pairs of chromosomes. If it undergoes mitosis, how many PAIRS of chromosomes will the daughter cells have?
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If a cell has 10 PAIRS of chromosomes and it undergoes mitosis, how many chromosomes total will each daughter cell have?
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Oooook even more challenging!
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Oooook even more challenging!
You are a scientist looking at the sperm cells of Orca Whales under a microscope. Each of these sperm cells has 22 chromosomes. How many chromosomes would you expect to find in a lung cell of an orca?
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1. Mitosis or meiosis? 40
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40 ? ?
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40 ? 40 40
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