6.1 variation in organism

7/18/2019 6.1 Variation in Organism

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CHAPTER 6:VARIATION6.1 Variation in organisms



Variation

The diferences in apartic!ar characteristic

(phenotype) "ond #ithina mem$er o" species



E%amp!es o" &ariation

• A$i!it' to ro!! tonge

• Ear !o$e t'pe

• T'pes o" (nger print

• )imp!es * non+dimp!ed chee,s

• A !ong * short second toe

• -od' #eight

• -od' height• -!ood grop



The importance o"&ariation

ma,es !i&ingorganisms diferent

"rom one another

he!p the organisms toadapt to theiren&ironment increases chances

sr&i&a!

contri$tes to the"ormation o" ne#species



T'pes o" &ariation

• Variation in pop!ation can $e stdied $'measring a chosen trait*characteristics in a !argenm$er o" diferent indi&ida!s

T#o T'peso" Variation

Continos&ariation

)iscontinos&ariation



Continos &ariation

• Contro!!ed $' thecom$ined efect o"man' genes(polygenic)

• /igni(cant!'afected $'environmentalfactors

• E.g.• Height

• 0eight



Continos &ariation

• raph a $e!!shaped norma!distri$tion



)iscontinos Variation

• 2a!!s into a "e#distincti&ephenot'pe*catego

ries• The trait is eitherabsent orpresent

• E.g• )imp!e chee,

• A-O $!ood grop



)iscontinos Variation

• Contro!!ed $'one*"e# genes

• Not aected by

environment• raph

discrete *categorica!

distri$tion



)iscontinos Variation +E%amp!es

6.1 variation in organism

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