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  Section: Genetics » Quantitative Inheritance
 
 
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Variance and standard deviation

 
     
 
Content
Quantitative Inheritance
Multiple factors
Binomial distribution
Effect of degree of dominance, number of genes and environment
Quantifying variability 
Variance and standard deviation
Partitioning of phenotypic variance
Heritability in broad sense and narrow sense


The variability observed for quantitative characters in a segregating population, as discussed in this section, is often quantified using statistical calculations. Without going into the details, we like to give formulae for calculating mean (), variance (S2) and standard deviation (S) which are useful in describing variability.



(where x = the variable,

xi = the ith measurement,

N = number of observations, and

σ = summation)



Standard deviation is considered important, because 66.7% of the population lies within the range of x̄± S.
 
     
 
 
     




     
 
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