Presentation on theme: "Question of the Day How are autosomal cells and sex cells different?"— Presentation transcript:
1 Question of the Day How are autosomal cells and sex cells different? 2-25How are autosomal cells and sex cells different?
2 Objectives Describe shape / function of a chromosome Describe differences between autosome & sex chromosomes.
3 Review2-25What am I?What am I?What am I?What am I?
4 Review Describe the structure of a chromosome. Identify the differences in structure between prokaryotic chromosomes and eukaryotic chromosomes.Compare the numbers of chromosomes in different species.Explain the differences between sex chromosomes and autosomes.Distinguish between diploid and haploid cells.
5 Sex Chromosome Abnormalities Female GenotypeSyndromeMale GenotypeXXnormalXYXOTurner XXYKlinefelterXXXTriple-XXYY
6 Question of the Day2-28What is the same about a homologous pair of chromosomes? What is different?
8 REVIEW What does a chromosome look like right before cell division? What’s a histone?How is a prokaryote different than a eukaryote?Which cells are haploid? Diploid?
9 Cell Division Cell division – is the process by which cells reproduce. In Prokaryotes:Binary fission – Division of a prokaryotic cell into 2 offspring cells.
10 In Eukaryotes: Cell Cycle Cycle consisting of cell division and interphaseCell divisionProcess of creating a new cellIncludes mitosis and cytokinesis.InterphaseTime between cellular divisionMajority of the life cycle of a cell
12 3 Parts of Interphase: G1 -- Cell Growth (duplicate organelles) S -- DNA replicationG2 -- Growth and preparation for cell divisionG0 – cells that do not again prepare for replication – basically stay in G1 phase
13 REVIEW Binary fission = ??? Two main parts of cell cycle in eukaryotes =3 parts of interphase = ???
14 Cell Division – Mitosis and Cytokinesis Mitosis – Process which ONE cell divides into TWO genetically identical cells – Asexual reproduction4 Stages:ProphaseMetaphaseAnaphaseTelophase
15 ProphaseChromatin coils into chromosomes (remember DNA was duplicated in the S phase)Nuclear membrane breaks downCentrioles appear and move towards poles of cellSpindle fibers appear. Spindle fibers = microtubules that radiate from centrioles and attach to chromosomescentriolesspindle fiberschromosomesnuclear membrane
17 Question of the Day 1. What are the four phases of mitosis? 3-11. What are the four phases of mitosis?2. What happens during prophase?Objective:Discuss what happens in anaphase and telophase
18 Review 1. How are chromosomes different from chromatin? 3-1 2. What are the 2 main stages of the cell cycle?What are the 3 main stages of interphase?What happens during each stage of interphase?What are the 2 main parts of cell division?3-1
19 MetaphaseSpindles move sister chromatids to the equator of the cell