chapt18LectureOutlines

chapt18LectureOutlines - Chapter 18 Patterns of Chromosome...

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1 Chapter 18 Patterns of Chromosome Inheritance Case Case Study Study ? ? Mechelle Mechelle and her and her peirced peirced ears ears ! ! What’s What’s a a keloid keloid ? ?
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2 Outline Introduction Chromosomes and the Cell Cycle Mitosis Phases of Mitosis Meiosis Stages of Meiosis Crossing-Over Comparison of Meiosis and Mitosis Chromosome Inheritance
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3 Introduction / Chromosomes and the Cell Cycle 3 Factors 3 Factors determining the make-up of an determining the make-up of an individual: individual: Physical characteristics (“genes”). Physical characteristics (“genes”). Environment. Environment. Spiritual condition Spiritual condition . . Gene Gene tics tics is the study of heredity. . . . . is the study of heredity. . . . . the study of how traits are passed from one the study of how traits are passed from one generation to the next. generation to the next.
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4 What What is the is the function of cell division function of cell division ? ? Growth > “mitosis” Growth > “mitosis” Repair > “mitosis” Repair > “mitosis” Reproduction > “meiosis” Reproduction > “meiosis” Chromatin Chromatin / / chromosome chromosome DNA DNA ~ 100,000 genes ? ~ 100,000 genes ? “recipe” for you ! “recipe” for you ! Human Genome Project Human Genome Project estimated only ~ 33,000 estimated only ~ 33,000 genes !!! genes !!! Now say, 20-25,000 genes !!!!!!!!! Now say, 20-25,000 genes !!!!!!!!!
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5 Each organism has a characteristic # of Each organism has a characteristic # of chromosomes ( chromosomes ( humans humans = 46 = 46 or or 23 pairs) that can 23 pairs) that can be identified by a be identified by a karyotype karyotype . . . . . . . . . . an arrangement of all chromosomes within a cell an arrangement of all chromosomes within a cell by pairs in a fixed order. by pairs in a fixed order. In humans: In humans: 22 pairs 22 pairs of non-sex chromosomes ( of non-sex chromosomes ( autosomes autosomes ) ) 1 pair 1 pair of of sex chromosomes sex chromosomes . . . . . . . . XX – female, XY – male. XX – female, XY – male. Thus, Thus, who who determines the child’s sex? determines the child’s sex?
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6
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7 Prior to cell division Prior to cell division each chromosome is composed of 2 genetically each chromosome is composed of 2 genetically identical parts termed identical parts termed chromatids chromatids (or (or sister sister chromatids chromatids ) held together at a region called a ) held together at a region called a centromere centromere . .
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8 Cell Increase and Decrease These represent opposing processes which by their very nature maintain balance ( homeostasis ) in the human organism. Cell division increases the # of body cells
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This note was uploaded on 01/17/2012 for the course BIOL 103 taught by Professor Robertwest during the Spring '12 term at Lee.

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chapt18LectureOutlines - Chapter 18 Patterns of Chromosome...

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