Chapter 10 for Courseweb (2)

Chapter 10 for Courseweb (2) - 10 Genetics: Mendel and...

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10 Genetics: Mendel and Beyond
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10 Genetics: Mendel and Beyond How are genes transmitted? What laws govern Inheritance? How chromosome behavior in meiosis explains these laws? How do genes and alleles interact? How are gene maps generated? What are sex chromosomes? What is sex-linked inheritance?
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What was understood about inheritance in early years? Early geneticists: Plant and animal breeders Breeders had two assumptions about how inheritance works: 1.Each parent contributes equally to offspring 2.Traits blend in the offspring and cannot subsequently separate.
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Who was Gregor Mendel? Gregor Mendel (1822-1884) 1856: Undertook 7 yr long genetic studies using over 24,000 plants. 1866: Published his new theory of inheritance Not readily accepted. Before he died in 1884 Mendel said: “My time will come.”
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Who was Gregor Mendel? By 1900: Meiosis observed. Three plant geneticists cited Mendel’s paper. Mendel’s time had come! He is considered the “Founding father of Genetics”
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Mendel’s Experimental Design Why garden pea? Distinct traits with contrasting forms Easy to cultivate Grew quickly Short life cycle Large number of offspring produced Self and controlled pollination
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Mendel’s experimental Design Character : observable physical feature (e.g., flower color). Trait : form of a character (e.g., purple flowers or white flowers). Heritable trait: Inherited True-breeding trait: Only one present for many generations
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Mendel’s Experimental Design endel created true-breeding strains by inbreeding and selection hose seven characters : eed shape eed Color lower Color
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Figure 10.2 A Controlled Cross between Two Plants (Part 1) Hermaphrodite Flowers contain both male and female parts Stigma Ovary Stamen Anther s
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Mendel’s Experimental Design Mendel’s crosses: Parental generation = P . Resulting offspring = first filial generation or F 1 . • If F 1 plants self pollinate, produce second filial generation or F 2 .
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Mendel’s Experimental Design Mendel’s first experiment: Crossed plants differing in just one trait ( P ). F 1 generation are monohybrids . The monohybrids were then allowed to self pollinate to form the F 2 generation: a monohybrid cross . Mendel repeated this for all seven traits.
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One trait of each pair disappeared in the F 1 generation and reappeared in the F 2 —these traits are recessive . The trait that appears in the F
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This note was uploaded on 03/18/2010 for the course BIOSC Bio 210 taught by Professor Deshmukh during the Spring '10 term at Pittsburgh.

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Chapter 10 for Courseweb (2) - 10 Genetics: Mendel and...

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