Lecture7.BioSci97

Lecture7.BioSci97 - Announcements Lecture 7 Answer Keys...

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1 Announcements Lecture 7 Answer Keys have been posted Exam scores will be posted shortly Scanned scantron cards available later
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2 Mendelian Genetics I: Basic Principles Lecture 7 Bio Sci 97 (sections B and C) G. Mendel carried out his experiments from 1856 to 1863 in a small garden plot nestled in a corner of the St. Thomas monastery in the town of Brno He published the results and his interpretation in its scientific journal in 1866 Results were ignored for over 50 years
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3 Outline Lecture 7 Mendel’s experiments and hypothesis Definitions Mendel’s Laws Principle of Segregation Principle of Independent Assortment Determining outcome of cross Punnett square
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4 Pea Plants: Traits (Note: Mendel chose discrete traits)
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5 Pea Plants: Cross (Male X Female) (create new allele combinations i.e. new genotypes)
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6 (1) Mendel Created True-Breeding Varieties X X P 1 (Parents) (round) (wrinkled)
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7 (2) Cross Round with Wrinkled X P 1 F 1 (First Filial Generation) … all round!
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8 (3) Cross the F 1 from the Previous Slide X F 1 F 2 2 nd Filial Generation Round:Wrinkled = 3:1!
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9 Summary of Mendel’s Experiments True-breeding plants with different forms of a trait, such as round vs. wrinkled seeds All of the F 1 progeny exhibited only one parental trait (round seeds) In F 2 generation obtained by self-fertilization of F 1 plants, the observed ratio of visible traits was 3 round : 1 wrinkled Outcome of cross was independent of whether the trait came from the male or female parent: reciprocal crosses produced the same result (see previous slide) Nomenclature – P 1 = parents – F 1 = 1 st filial generation
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Lecture7.BioSci97 - Announcements Lecture 7 Answer Keys...

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