Click here to load reader

Reproduction Asexual Reproduction. New organisms develop from cells of the parent – identical to parent

  • View

  • Download

Embed Size (px)

Text of Reproduction Asexual Reproduction. New organisms develop from cells of the parent – identical...

  • ReproductionAsexual Reproduction

  • Asexual ReproductionNew organisms develop from cells of the parent identical to parent

  • Asexual ReproductionAll cells arise from other cells by cell division

  • MitosisThe exact duplication of the complete set of chromosomesSeparation of these chromosomes into two complete setsChromosome contains hereditary information of an organism

  • Chromatid one strand of a double-stranded chromosomeCentromere structure which joins the two chromatids togetherChromatidsCentromere

  • Mitosis Cytoplasmic division results in formation of two daughter cellsEach daughter cell contains exact number & type of chromosomes as parent cell

  • Mitosis The Process1) INTERPHASEReplication of each single-stranded chromosome during the non-dividing periodResults in a double-stranded chromosome

  • Mitosis The Process2) PROPHASEDisintegration of the nuclear membraneSynthesis of a spindle apparatus to help the division

  • Mitosis The Process3) METAPHASEAttachment of double-stranded chromosomes to spindle apparatus at centromere

  • Mitosis The Process4) ANAPHASEReplication of each centromereResults in formation of two single-stranded chromosomesChromosomes move along spindle apparatus to opposite ends of the cell

  • Mitosis The Process5) TELOPHASENuclear membrane forms around each set of chromosomesCell pinches in

  • Plant Mitosis vs Animal MitosisSimilar process In animal cells:Centrioles form the spindle apparatusCytoplasmic division is a pinching in of cell membraneIn plant cell, a cell plate is synthesized

  • CancerGroup of diseases often characterized by uncontrolled cell division of certain abnormal cells

  • Asexual Reproduction1) Binary fissionEqual division of cell of an ameba, paramecium, bacteriumResult: Two equally sized organisms

  • Asexual Reproduction2) BuddingUnicellular organisms (yeast) similar to binary fission except cytoplasm division is unequalNew cells stay together (colony) or may detach

  • Asexual ReproductionMulticellular organisms (hydra) Production of multicellular outgrowth from parentDetach or form colony

  • Obelia colony

  • Asexual Reproduction3) SporulationSpores single, specialized cellsSurvive very well withstand tough conditions Released from parent & develop into new individualsEx- bread mold

  • Asexual Reproduction4) RegenerationDevelop of entire new organisms from part of parentEx starfish develop from single armAlso refers to replacement of lost structuresEx lobster regenerates a lost claw

  • Asexual ReproductionInvertebrate animals possess more undifferentiated cells than vertebratesMeans that invertebrates can regenerate easier than vertebrates

  • Asexual Reproduction5) Vegetative propagationNew plants develop from roots, stems, leaves of parent plant

  • Asexual ReproductionCuttings GeraniumBulbs OnionTubers PotatoRunners StrawberriesGrafting Seedless Orange

Search related