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1/20 & 1/21 - 7 th Grade Agenda Collect HW: Reading & Notetaking p. 101 – 104 & Signed Grade Printout Last Day to turn in late work for the Semester Late Science Faire Background Presentations Genetic Traits Activity Human Traits Micro Viewer Lab (Central Nervous System) Video: BBC (Challenges of Life) Text Book Reading: 199 – 203 HW: Reading & Notetaking p. 105 - 108 Reminder Procedure, Data Table, Graph & Results due 2/9 & 2/10 (15 Points)
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Reflection Prompt: Write 2 differences between DNA and RNA
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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 to humans have? 23
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Sex Linked Genes Genes on the X and Y chromosomes are called sex linked genes Most of the genes on the X chromosomes are not on the Y chromosomes Since Males have the Y chromosomes they are missing an allele.
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Red – Green colorblindness More males have red – green color blindness then females Why?
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Red – Green colorblindness
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Genetic Disorders – Cystic Fibrosis Cystic Fibrosis is a disorder in which the body produces abnormally thick mucus in the lun___ and intes_____. The thick mucus fills the lungs making it hard for the affect person to breathe. gs tines
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Genetic Disorders – Sickle Cell Disease Sickle shaped red blood cells clog blood vessels and cannot carry as much ox_____ as normal cells. ygen
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Genetic Disorders – Hemophilia People with Hemophilia do not produce one of the prot_____ needed for normal clotting. They can die from simple cuts and bruises ein
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Genetic Disorders – Down Syndrome In Down syndrome, a person’s cells have an extra copy of chrom______ 21 People with Down syndrome have some degree of mental retar________ osome dation
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Reflection Prompt: Write 3 facts you learned from the video
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