Study Guides (248,151)
Canada (121,346)
BIOL 112 (24)
all (7)

Biology Half 2.docx

83 Pages
38 Views
Unlock Document

Department
Biology (Sci)
Course
BIOL 112
Professor
All Professors
Semester
Spring

Description
TheCellCycleHeredityAllorganismscomefromotherorganismsAllorganismsresembletheirparentsSiblingsareNOTidenticalManyspermwilltrytogetintotheeggbutonlywillactuallysucceedEveryorganismbeginswiththefusionofthetwocellsThisfertilizedeggthenundergoescelldivisionstoallowthecellstomultiplyandallowtheorganismtogrowCellTheoryHigherorganismsfusetheircellsspermandeggtomakenewonesDividingcellsdevotealotofresourcestosegregatingtheirchromosomesTheyspendmoretimeondividingthechromosomesthenactuallygrowingThereforeitisveryimportantChromosomeasinglestrandofDNATheyareeithercircularbacteriaorlinearmostofeverythingelseWhenthecellisgettingreadytodividethechromosomecondensesbyassociatingwithproteinshistonesThecombinationofproteinandDNAiscalledchromatinWhenitisaloneitlookslikeabigmassofspaghettibutwhenitconeensesitismuchmorestructuredWhentheDNAwrapsaroundthehistoneproteinswhichwraparoundotherthingsetcitbecomesveryorganizedandabletoundowithoutgettingtangledThisisthereasontheydothisTheyneedtobeneatKaryotypeawayoforganizingandidentifyingchromosomesYoucantakeacellthatisreadytodivideandsquashanddyeitThenyoucanseparatethechromosomesfromtheproteinandthenorganizethechromosomesintodifferentbandingpattersWhenthisisdoneitisseenthateachchromosomehasanexactotheronethatisidenticaltoitThereare22pairsofchromosomesinhumansThereisanotherchromosomethatissinglecalledtheXandthesmalleronecalledtheYThenumberofchromosomesischaracteristicofthespeciesSpecies of Chromosomes2Roundworm Ascaris8Fruit Fly Drosophila14Garden Pea Pisum22Cricket Gryllus40Mouse Mus46Human Homo80Pigeon Columba100Indian Fern OphioglossumIneukaryoteschromosomescomeinpairsthatlookalikeJustbeforecelldivisioneachchromosomehasbeenreplicatedonestoproducetwochromatidsEachchromosomeisactuallytwopiecesofDNAchromatidsNormallyachromosomeisasinglepieceofDNAHoweverwhenwelookatakaryotyopeweareactuallyseeingtwopiecesofDNAthetwochromatidsboundbyacentromereWecalltheseMitoticChromosomestoindicatethattheyrepresentaspecialcaseWhenthecellgoestodivideeachofthetwochromatidsgotoadifferentdaughtercellTheprobabilityofeachdaughtercellgettingoneofeachchromatidifitwasntdesignedtodosoisextremelylow
More Less

Related notes for BIOL 112

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit