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A single cell divides into two identical daughter

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A single cell divides into two identical daughter cells. Daughter cells have same # of chromosomes as does parent cell. Mitosis From the Virtual Cell Biology Classroom on ScienceProfOnline.com Images: Cell cycle by Richard Wheeler; Overview of Mitosis , Mysid
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__________ - A single germ cell divides into four unique daughter cells. - Daughter cells have half the # of chromosomes as parent cell. - We will discuss meiosis in out next lecture. Now, back to mitosis… What is cell division of reproductive cells? From the Virtual Cell Biology Classroom on ScienceProfOnline.com Image: Overview of Meiosis , National Institutes of Health
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Genetics Terminology : Homologues Chromosomes exist in homologous pairs in diploid (__n) cells. Q. What does diploid mean? Exception: Sex chromosomes (X, Y). Other chromosomes, known as ___________ , they have homologues. From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Packing for the move When cell is not dividing… DNA molecules in extended, uncondensed form = __________ Cell can only replicate and transcribe DNA when in extended state. When cell is preparing for division… DNA molecules condense to form ______________ prior to division. – each chromosome is a single molecule of DNA – easier to sort and organize the replicated DNA into daughter cells From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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From the Virtual Cell Biology Classroom on ScienceProfOnline.com Packing for the move Image: Chromatin structures , Zephyris When we depict chromosomes for this class—when we are drawing them ourselves—we want to make them easy to draw and understand.
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Mitosis 4 sub-phases: 1 st – Prophase 2nd – Metaphase 3rd – Anaphase 4th – Telophase followed by Cytokinesis Secret to remembering phases in order… From the Virtual Cell Biology Classroom on ScienceProfOnline.com Image: Mitosis diagram , Marek Kultys
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___________ Images: Prophase drawing , Henry Gray's Anatomy of the Human 3 Major Events - chromosomes condense - spindle fibers form - chromosomes are captured by spindle From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Mitotic Spindle Forms spindle fibers are specialized microtubules • spindle fibers radiate out from centrioles , forming the “aster” • centrioles occur in pairs, and are duplicated during interphase Fluoresced eukaryotic cell. Chromosomes in blue. Mitotic spindle apparatus in green.
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A single cell divides into two identical daughter cells...

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