Lecture 4 - How to measure variation? -Statistics What is a...

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How to measure variation? -Statistics What is a distribution -tells how frequent diff things are -Discrete distribution Bar graph Hair color -Continous distribution Body heights Variation in some traits is discrete -Seed shape, color etc Variation in other traits is continous -height What is a mean -can be positive or negative What is a variance -measures spread around the mean -can be zero or positive but cannot be negative - The average of the  squared  differences from the Mean. No variance =no evolution -unit is squared What is a correlation -measures the association between to variables - -1 to 1 No correlation r=0 Positive correlation r= 0.7 Negative correlation r= -0.7 Know how to calculate mena and variance Lecture 4: Natural selection Genetic variation in continous traits Genotype-geneticc makeip of an individual Phenotype- The properties of an individual that seslcetion can act on How can (discrete)variation in genes cause variation in phenotypes? - reletivley small number of loci can make large number of genotypes 15 loci = 14348905 genotypes
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Also affected by environment - How much of the variation is from genes and how much from environment? Vp= phenotypic variance= VG+VE VG = genetic variance- causes evolutionary change VE= environmental variance- not transmited from parent to pffspring Heretibilaty- the proportion of the phenotypic variance caused by genetic variance = the
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Lecture 4 - How to measure variation? -Statistics What is a...

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