Estimation

ESTIMATION OF RESEMBLANCE BETWEEN RELATIVES

  • The partitioning of phenotypic variance into components attributable to different causes (VA, VD, VI) are called as causal components of variance denoted by V.
  • The measurement of the degree of resemblance between relatives rests on the partitioning of the phenotypic variance into components corresponding to the grouping of the individuals into families (full sibs, half sibs).
  • These components can be estimated directly from the observed phenotypic values and are known as observational components of phenotypic variance denoted by σ2.
  • For estimation of resemblance between relatives (full sibs, half sibs) the total observed variance is partitioned into two components namely between group components (σ2B) and within group components (σ2W).
  • The greater the similarity within the groups, the greater in proportion will be the difference between the groups.
  • The resemblance between relatives can be either similarity of individuals in the same group or the difference between individuals in different groups.
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Last modified: Saturday, 17 December 2011, 11:40 AM