PowerPoint Presentation
Name: Shaikh Yasmin Rashid
AhmedDate:-13/9/14Std:XSchool:Anjuman-I-Islams A.A.Khatkhatay
English secondary schoolChp:The life cycleTopic:Reproduction and
modes of reproductionReference: www.heathersanimation.com
www.google.com www.youtube.com
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The life cycle
ReproductionAll living organisms produce new individual of same
species
That is a new, generation of species from an existing
individual
Significance of reproduction Necessary to maintain the number of
individuals of speciesTo prevent their extinction
Chemical reactionsDNA copies
parentChildidenticalsimilar
Variation:the changes that occur during the process of
replication or formation of DNA copy,these changes are known as
variation.
DNA copyminor changesVariationParent DNAChild DNA
Imagine the confusion when everybody arounds you look
same.Creates Diversity
IMPORTANCE OF VARIATION
Importance of variationSurvival of species
npairs
2n
2n2n2n2n
Number of chromosomesTotal number of chromosomesTotal number of
chromosomes in each childParent cellDaughter cell
Modes of Reproduction
Body cells(somatic cells)Only one parent involved2n
2n2nMITOSIS
Two parents involvedSexual reproductionReproductive cells(germ
cells, gametesAsexual reproduction
nn2nMEIOSIS
1)Binary fission(PARAMOECIUM)
Parent cellNucleus dividesCytoplasm dividesTwo daughter
cellsASEXUAL REPRODUCTION:
Binary fission in paramoecium.
EvaluationALTYIKGMSMZGHPNKEAOTOGIFXLYEALDNUEXJBKDKAQWDKAUDLFVCVCBG
Unicellular animalClues:One of the two sexesMode of
reproductionReproduction without union of gametesType of asexual
reproduction
Thank you
