AP LAB 3 MEIOSIS.doc - I. Meiosis Simulation ANALYSIS AND...

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I.Meiosis SimulationANALYSIS AND INVESTIGATION1.List 3 major differences between the events of mitosis and meiosis2.Compare mitosis and meiosis with respect to each of the following in table 3.2Table 3.2MITOSISMEIOSISCHROMOSOME NO. OFPARENTAL CELLNUMBER OF DNAREPLICATIONNO. OF DIVISIONSNO. OF DAUGHTER CELLSPRODUCEDCHROMOSOME NO. OFDAUGHTER CELLSPURPOSE & FUNCTION3.How is meiosis i and meiosis ii different?4.How do oogenesis and spermatogenesis differ?5.Why is meiosis important for sexual reproduction?II. Crossing Over during Melosis inSordariaSordaria fimicolais an ascomycete fungus that can be used to demonstrate the results of crossing overduring meiosis.Sordariais a haploid organism for most of its life cycle. It becomes diploid only when thefusion of the mycelia of two different strains results in the fusion of the two different types of haploidnuclei to form a diploid nucleus. The diploid nucleus must then undergo meiosis to resume its haploid state.Meiosis, followed by mitosis, inSordariaresults in the formation of eight haploid ascospores containedwithin a sac called an ascus (plural, asci). Many asci are contained within a fruiting body called aperithecium. When ascospores are mature the ascus ruptures, releasing the ascospores. Each ascospore can
develop into a new haploid fungus. The life cycle ofSordaria fimicolais shown in Figure 1.

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