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Genetics: Chromosomes and DNA
G4- I can compare the inherited structural traits of offspring and their parents
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What is DNA? Write what you think it is on your whiteboard
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Genes Genes are SEGMENTS of DNA; each one contains a different INSTRUCTION for how to make an organism.
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What are examples of genes that you have?
List as many examples as you can on your whiteboard in 30 seconds
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Chromosome A chromosome is the STRUCTURE of DNA. It’s how the DNA looks in your cells!
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Chromosome analogy: Shoes
I need 4 volunteers who would be willing to give me their shoes. Raise your hand if you would like to donate shoes!
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Chromosome analogy: Shoes
The shoes represent PAIRS of CHROMOSOMES
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Chromosomes Turn to your partner: What percentage of genes/DNA/chromosomes do you get from your mom, and what percentage of genes do you get from your dad? Write it on your whiteboard.
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Chromosomes Circle one shoe from each pair in number 4.
Each offspring gets HALF of their chromosomes from each parent.
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Chromosomes Humans have ____________ pairs of chromosomes.
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Toss a coin We are going to make some offspring from the pairs of shoes up front by randomly flipping a coin. Heads: Right shoe Tails: Left shoe
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Chromosomes In sexual reproduction, are all offspring the same as their siblings? Explain.
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