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finalbild1guide - Genetics Lecture Objectives 16:54:00 ←...

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Unformatted text preview: Genetics Lecture Objectives 09/12/2007 16:54:00 ← 1. Explain how Mendel’s particulate mechanism differed from the blending ← theory of inheritance. ← Blending Theory= genetic material from two parents blend, i.e blue and yellow make green. ← Particulate hypothesis- parents pass on discrete heritable units. ← 2. Explain the components of Mendel’s hypothesis that led him to deduce the ← law of segregation. ← A. Alternative versions of heritable factors account for variation in inherited characters. Factors now called genes and alternative versions are now called alleles. ← B. for each character, get two alleles, one from each parent ← C. If two alleles differ, the dominant allele determines appearance, recessive has no noticeable effect. ← D. Two alleles for a gene separate during gamete formation and end up in different gametes. This is the law of segregation . ← 3. Use a Punnett square to predict the results of a monohybrid cross, stating the phenotypic and genotypic ratios of the F2 generation. ← 4. Explain how a testcross can be used to determine if an individual with the ← dominant phenotype is homozygous or heterozygous. ← Cross the dominant phenotype with a recessive phenotype, the genotype is known there. if all offspring show dominant phenotype, then it is homozygous, if half show and half show the recessive, then it is heterozygous. ← 5. Use a Punnett square to predict the results of a dihybrid cross and state the phenotypic and genotypic ratios of the F2 generation. ← 9:3:3:1 ← 6. State Mendel’s law of independent assortment and describe how this law can be explained by the behavior of chromosomes during meiosis. ← To find the probability of independent events, multiply the probabilities. Ex, chance of having five girls is ½^5 ← 7. Calculate the probability that a particular F2 individual will be homozygous 7....
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finalbild1guide - Genetics Lecture Objectives 16:54:00 ←...

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