BIOL 1103 1st Edition Lecture 13Outline of Last Lecture II. Mitosis and CytokinesisIII. DNA and MitosisIV. ChromosomesV. Mitosis StagesVI. Cell CycleVII. CancerOutline of Current Lecture VIII. Meiosis and human sexual life cycleIX. ChromosomesX. Crossing over and RecombinationXI. Independent assortmentXII. Nondisjunction Current Lecture- Meiosis = prepares for sexual reproductiono Reduces number of chromosomes by half in the formation of haploid gametes in animals and spores in plantsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.oo- Chromosomes:o Diploid – Having two of each type of chromosome (2N)Haploid – Having a single set of chromosomes (1N)o Homologous chromosomes come in pairs; diploid species have matching pairs homologous chromosomes; carry corresponding geneso Chromosomes being separated through meiosis 1 and 2:o- Crossing over and recombination:o Nonsister chromatids intertwine with each other forming a tetrad and are then separate before they have time to return the parts of their nonsister chromatid partnero- Independent assortment:o Describes the possible arrangement of chromosomes as they split in meiosis 2; there are over 8 million possible combinations of chromosomes in this phaseo Below are twoo- Nondisjunctiono Describes how chromosomes can be unevenly distributed resulting in cells with extra chromosomeso This can cause disabilities such as Down
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