gen380F11StLect2

gen380F11StLect2 - GENETICS 380 LECTURE 2: Mitosis and...

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http://www.cellimagelibrary.org/images/10086 GENETICS 380 LECTURE 2: Mitosis and Meiosis
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- Traits are determined by discrete units that are inherited intact through generations - Each individual has 2 particles in their genotype, but they pass only 1 particle on to progeny Remember Mendel’s Theory of Particulate Inheritance?
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Walther Flemming (1843 – 1905) Walter Sutton (1877 – 1916) Theodor Boveri (1862 – 1915) Using light microscopy to watch cells divide helped to identify the “particles”
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Some important observations from microscopy - when all eukaryotic cells divide, the nucleus divides first - chromosomes are present in the nucleus - cells from different species contain different total chromosome #s - all somatic (body) cells from one species have the same chromosome # , whereas germ cells (gametes) have half
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- Traits are determined by discrete units that are inherited intact through generations - Each individual has 2 particles in their genotype, but they pass only 1 particle on to progeny Let’s think about the Particles in Mendel’s Theory as Chromosomes
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- physical structure that carries genes - DNA molecule containing genetic information arranged in a linear sequence -in eukaryotes, contains DNA, RNA, and proteins - in dispersed state (called chromatin) during most of cell cycle - coils up and condenses during MEIOSIS & MITOSIS Fig 2.10
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gen380F11StLect2 - GENETICS 380 LECTURE 2: Mitosis and...

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