Lecture 10 SLIDES

Lecture 10 SLIDES - ANNOUNCEMENTS Wednesday February 10th...

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ANNOUNCEMENTS - Wednesday, February 10th Problem Set 4 Key posted tonight. Second midterm is one week from tonight. This will cover Lectures 6-10 (Chapters 8-10, 12-13). Review Session Saturday, February 13, 10-12 AM in Center 115. Extra office hours today through Tuesday - see website for details. Practice Exam 2 on website. No class Monday, 2/15. President’s Day. Stages of the Cell Cycle Figure 12.5 …Interphase --> Mitosis --> Interphase --> Mitosis… INTERPHASE G 1 S (DNA synthesis) G 2 Mitosis Prophase Prometaphase Metaphase Anaphase Telophase Mitotic Phase Cytokinesis
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Asexual vs. Sexual Reproduction Asexual reproduction One parent produces genetically identical offspring by mitosis Parent Bud 0.5 mm Sexual reproduction Two parents give rise to offspring with unique combinations of genes Figure 13.1 Asexual Reproduction Asexual reproduction One parent produces genetically identical offspring by mitosis Parent Bud 0.5 mm Figure 13.1 Sexual Reproduction Two parents give rise to offspring with unique combinations of genes Heredity transmission of traits from one generation to the next Variation offspring differ from parents and siblings Genetics Study of the mechanisms underlying heredity and variation Genes - units of heredity - segments of DNA Offspring acquire genes inherited on chromosomes Chromosomes one set inherited from mother, one set from father Humans = 2 sets of 23 chromosomes (46) The process of meiosis underlies Heredity and Variation , and ensures the inheritance of a combination of chromosomes (…traits…) from mother & father
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“Reducing Division” (in half) Division of diploid cell with two sets of chromosomes to generate 4 haploid gametes, each with one set of chromosomes Fusion of sperm & egg gametes to generate zygote with two sets of chromosomes Meiosis and Fertilization alternate in sexual life cycles Fertilization Meiosis Figure 13.3 One set of chromosomes inherited from each parent Humans Karyotype (2n = 46) 2 sets of 23 chromosomes, including 2 sex chromosomes 5 ! m Pair of homologous chromosomes Centromere Sister chromatids Homologous chromosomes - Two chromosomes composing a pair - Have the same characteristics - May also be called autosomes Sex chromosomes - Distinct from each other (X and Y) - Determine sex: XX female, XY male Diploid cells have two sets of chromosomes Figure 13.4 Diploid cell has two sets of chromosomes Maternal set of chromosomes ( n = 3) Paternal set of chromosomes ( n = 3) 2 n = 6 Two sister chromatids of one replicated chromosome Two nonsister chromatids in a homologous pair
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This note was uploaded on 04/03/2010 for the course BIOLOGY BILD 1 taught by Professor Traver during the Winter '10 term at UCSD.

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Lecture 10 SLIDES - ANNOUNCEMENTS Wednesday February 10th...

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