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1/24 & 1/25 - 7th Grade Agenda
Learning Objective: Human TraitsCollect HW Genetic Activities Worksheet Collect Late Science Fair Background2nd Semester PretestClass Work: Scientific Method WorksheetVideo: BBC (Challenges of Life)Text Book Reading: 192 – 198HW: Reading & Notetaking p. 101 – 104Reminder: Science Fair Procedures, Data Table & Results due 2/9 & 2/10 (15 Points)
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Last Day to Turn in Latework for this Semester 1/24 & 1/25
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Reflection
• Prompt: Write 2 differences between DNA and RNA
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DNA vs RNA
• Master Copy• Two Strands• Never leave
nucleus
• Copy• One Strand• Leaves the
nucleus
DNA RNA
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Step 1 in Protein Synthesis
• Messenger RNA Production
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Step 2 in Protein Synthesis
• Messenger RNA attaches to a Ribosome
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Step 3 in Protein Synthesis
• Transfer RNA attaches to a Messenger RNA
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Step 4 in Protein Synthesis
• Protein Grows
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Mutation
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Mutation
• Mutation means “cha_____” in Latin
• Mutation can cause a cell to produce an incorrect pro____ during protein synthesis.
• As a result, the organism’s trait, or pheno____, may be different from what it normally would have been.
nge
tein
type
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Some human traits are controlled by a single gene that
has more than two alleles
• Blood type is controlled by three Alleles
• What are the major human blood types?
• A, B, AB & O• Which human blood type
is a universal donor?• Blood Type: O
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Many human traits are controlled by many genes
• Four genes control height in humans• Skin, eye and hair color are controlled by
multiple genes
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What are the Female Sex Chromosomes?
• XX
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What are the Male Sex Chromosomes?
• XY• Because there is
some missing genetic information in the “Y” chromosomes, Males are more likely to get a sex-linked trait
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Who determines whether the child is a boy or a girl ?
• Father
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How many pairs of chromosomes do humans have?• 23