Gregor Mendel
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Transcript of Gregor Mendel
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Gregor Mendel
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Gregor Mendel
Students will be able toDescribe the results of Mendel’s experiments
Identify what controls the inheritance of traits in organisms
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Genetic TermsHeredity
The passing of physical characteristics from parents to offspring
GeneticsThe study of heredity
CharacteristicsObservable items on a living thing
Hair color, Height, Weight…Trait
A different form of a characteristicExample – Hair Color
Blond, Brown, Red, …
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Mendel’s chart
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Mendel’s Experiment
• Breeding pea plants• Female part (eggs) = Pistil• Male part (pollen/sperm) = Stamens
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Breeding
• Purebred organism = offspring of many generations that all have the same trait.
• Hybrid organism = mixed traits
Experimental Definitions• P = Purebred parents• F1 Generation = Children of purebred parents
• F2 Generation = Grandchildren of parents
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Experiment
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Offspring
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Offspring
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Terminology
Gene
Something that determines what trait you have
Example: You have blue eyes because you gene that controls eye color
Allele
Different forms of a gene
Example:
Blue eyes because your eye color gene is blue
“Blue Allele”
Brown eyes because your eye color gene is brown
“Brown Allele”79
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Symbols
• Dominate trait is always capital letter• Recessive trait is same letter as dominate letter
but lower case
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Numbers of Alleles
Get two alleles for each gene
One from Mom
One from Dad
Purebred have both alleles the sameHybrid have a different allele from each parent
Get one version from dad and a different one from mom
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Experiment
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Offspring
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Mendel
Completely unknown in his time
Work was lost for several decades
Only rediscovered in recent history
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Question of the Day
Describe in your own words what happened when Mendel bred the two pea plants. In your essay include the P, F1, F2 generations.
4 3 2 1
100% 80% 60% 40%
Exceeds expectations
Required Work
Missing a few items
Missing many items
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The Test Cross
• P Generation
H = Short Hair
h = Long hair
H? hh
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F1 Generation
H? hh
H? hh H? H?
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Horses
Black coat (B) is dominate
Brown coat (b) is recessive