3-1 Mendel’s Work Pages 86 - 91. Early Principles of Inheritance.
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Transcript of 3-1 Mendel’s Work Pages 86 - 91. Early Principles of Inheritance.
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3-1 Mendel’s Work
Pages 86 - 91
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Early Principles of Inheritance
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heredity p 86
•The passing of traits from parents to offspring
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heredity
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genetics p 86
•The scientific study of heredity
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genetics
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Gregor Mendel
• Born: July 20, 1822 • Died: January 6, 1884 (aged 61)• Born: Austria-Hungary (now part of Czech
Republic)• Fields: Genetics• Institutions:Abbey of St. Thomas in Brno• Alma mater: University of Vienna• Known for: Discovering genetics• Religious stance: Roman Catholic
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Gregor Mendel
• (July 20, 1822 – January 6, 1884) was an Augustinian priest and scientist, and is often called the father of genetics for his study of the inheritance of traits in pea plants.
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Gregor MendelMendel showed that the inheritance of traits follows particular laws, which were later named after him. The significance of Mendel's work was not recognized until the turn of the 20th century (1900). Its rediscovery prompted the foundation of the discipline of genetics.
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Gregor Mendel
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Mendel’s Peas
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Mendel’s Peas
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Mendel’s Experiments
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trait p 86•A characteristic that an organism can pass on to its offspring through its genes
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trait
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trait
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Mendel: some genes are dominant
link
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The seven traits that Mendel studied in the peas were:
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Cross Pollination
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purebred p 87
• An organism that always produces offspring with the same form of a trait as the parent
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purebred
BB BB BB BB
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purebred
B B
B BB BB
B BB BB
Offspring: 100% Black
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purebred
BB BB BB BB
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Purebred Cross
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filial•means “son” in Latin•F1 generation
children
•F2 generation grandchildren
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F1 Generation
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F1 Generation
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F2 Generation
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Dominant and Recessive Alleles
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gene p 89
•A segment of DNA on a chromosome that codes for a specific trait
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gene
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allele p 89
•The different forms of a gene
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allele
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allele
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Principle of Dominance
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dominant allele p 89
•An allele whose trait always shows up in the organism when the allele is present
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dominant allele
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Principle of Segregation
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recessive allele p 89
•An allele that is masked when a dominant allele is present
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recessive allele
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recessive allele
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Principle of Independent Assortment
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hybrid p 90
• An organism that has two different alleles for a trait; an organism that is heterozygous for a particular trait
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hybrid
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Dd x Dd
link
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Mendel’s Law of Genetic Inheritance
link
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