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The Data

Pregnant mothers are collected. One offspring from each mother is randomly selected and its genotype determined. In addition, the genotypes of a random sample of non-reproductive (``sterile'') females and adult males are determined. The data can be summarized as follows:

  Offspring      
Mother $A_{1}A_{1}$ $A_{1}A_{2}$ $A_{2}A_{2}$ $\sum$ ``Sterile'' Females Males
$A_{1}A_{1}$ $C_{11}$ $C_{12}$ -- $F_{1}$ $S_{1}$ $M_{1}$
$A_{1}A_{2}$ $C_{21}$ $C_{22}$ $C_{23}$ $F_{2}$ $S_{2}$ $M_{2}$
$A_{2}A_{2}$ -- $C_{32}$ $C_{33}$ $F_{3}$ $S_{3}$ $M_{3}$
Total       $F_{0}$ $S_{0}$ $M_{0}$

Given the total sample size for mother-offspring pairs, ``sterile'' females, and males, how many free parameters are there? How many frequencies would we need to know to reproduce the data?

6 for mother-offspring pairs
2 for ``sterile'' females
2 for males
10 total


next up previous
Next: The Analysis Up: Selection Components Analysis Previous: Introduction
Kent Holsinger 2008-08-25