ch13 biology notes part 2

ch13 biology notes part 2 - CH 13: Mendel and the gene...

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CH 13: Mendel and the gene Where we’ve been so far… 1. Genetics vocab 2. Mendel’s experiments 3. Mendel’s principles of segregation & independent assortment 1. Predicting genotypes and phenotypes 2. Mendel’s contributions to genetics 3. Chromosomal theory of inheritance 4. Testing and extending the chromosome theory Where we’re going…
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Dihybrid Cross – exercise from Tues KEY: Yellow leaves: g Tall plants: T (dominant) Green leaves: G (dominant) Short Plants: t # of genotype combos for each phenotype: Green/Tall: GGTT GgTT GGTt GgTt Green/short: GGtt Ggtt Yellow/ Tall: ggTt ggTT Yellow/short: ggtt What are the organism genotypes being crossed? P: ggTT X GGtt = F:1 GgTt F1: GgTt X GgTt = F2…
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Dihybrid Cross – exercise from Tues Ovules Genos: Phenos: Pollen Grains X G XT Xg Xt GgTt GgTt GT Gt gT gt Genos: 9 green/tall: 3 green/short: 3 yellow/tall: 1 yellow/sh
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2 Fundamental Patterns in Genetics: 1. Segregation 2. Independent Assortment But, what if we don’t know the P-generation genotypes?
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Mate an individual of unknown genotype with a homozygous recessive individual– offspring reveals parent’s genotype PREDICTING GENOTYPES AND PHENOTYPES
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F1 parent Homozygous recessive parent rryy RrYy All ry RY Ry rY ry 1/4 1/4 1/4 1/4 1/4 RrYy 1/4 Rryy 1/4 rrYy 1/4 rryy TEST CROSS Test F1 Genotype by breeding it with HOMOZYGOUS RECESSIVE Phenotypes: 31, 26,27,26 = ~1:1:1:1
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Allele segregation (gamete formation) and re- forming (fertilization) obey the rules of probability PREDICTING GENOTYPES AND PHENOTYPES OR… use mathematics/ statistics!
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Patterns of inheritance can be interpreted only after obtaining LARGE # samples (many crosses, many offspring
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This note was uploaded on 03/19/2008 for the course LBS 144 taught by Professor Urquhart/peters during the Spring '07 term at Michigan State University.

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ch13 biology notes part 2 - CH 13: Mendel and the gene...

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