Lec02 01_09_08 Variations

Lec02 01_09_08 Variations - 2 Variations 2 Variations How...

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Unformatted text preview: 2. Variations 2. Variations How uniqueness is created Cheung – Chapter 2 Faces Faces Why are we unique? Why are we unique? • 1 in 6.5 billion • What causes this variation? • What is the significance of being unique? • Uniqueness lies in our DNA Festival of Twins Festival of Twins Twinsburg, OH Twinsburg, OH Twins Twins • Monozygotic twins (identical twins) – 4 in every 1,000 live births • Dizygotic twins (fraternal twins) – 12 in every 1,000 live births Identical twins Identical twins Monozygotic = one fertilized egg Common placenta Fraternal Fraternal twins twins Dizygotic = two fertilized eggs Two placentas Gregor Mendel Gregor Mendel Father of Genetics Father of Genetics • 1822 – 1884 • Austrian monk (Brno, Czech Republic) • 1866 – published: Experiments in plant hybridization • Mendel’s Laws – Segregation • Cells can contain two versions for the same trait (gene) • Different versions alleles • Alleles are separated in the gametes. – Independent Assortment • Alleles for different traits sort independently • Mechanism unknown for a century Discovering the structure of DNA...
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This note was uploaded on 05/01/2008 for the course BSC 1005 taught by Professor Brist during the Spring '08 term at University of Central Florida.

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Lec02 01_09_08 Variations - 2 Variations 2 Variations How...

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