Lecture 11 Chromosomes & Sex Linkage Student_1

Lecture 11 Chromosomes & Sex Linkage Student_1 -...

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Unformatted text preview: Chromosomes and Sex Linkage Learning Objectives 4-1 1. Describe what is happening to chromosomes as the cell undergoes mitosis and meiosis. 2. Explain the differences and similarities between mitosis and meiosis. 3. Explain how crossing over produces recombined chromosomes 4. Understand how chromosome theory correlates Mendel’s laws with chromosome behavior during meiosis. 5. Explain how specific traits are carried on specific chromosomes. 6. Analyze sex-linked pedigrees and problems Mechanisms of Sex Determination Species Humans & Drosophila XX XY Moths and C. elegans XX XO Birds & Butterflies ZW ZZ Bees & Wasps Diploid Haploid Lizards & Alligators Cool temp Warm temp Tortoises & Turtles Warm temp Cool Temp Anemone Fish Older adults Young adults Table 4.2 THE CELL CYCLE Alteration between Interphase and Mitosis Fig. 4.7a 4 Interphase The period between divisions Longest phase of the cell cycle The cell prepares to divide Divided into 3 phases: DNA Packaging in Eukaryotes Read 13.1: 466-468 A chromosome is a very long molecule Chromatin = DNA is tightly packaged with positively charged proteins called histones Nucleosomes = DNA +core histones 10 nm “Beads on a String” 30 nm Chromatin Fiber Sister chromatids Meiosis My-Oh-sis Chromosomes replicate once....
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This note was uploaded on 04/05/2009 for the course BIOL 202 taught by Professor Kieber-hogan during the Spring '08 term at UNC.

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Lecture 11 Chromosomes & Sex Linkage Student_1 -...

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