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In order to readily have the generation stated for a certain person, the Ahnentafel numbering may be preceded by the generation. This method's usefulness becomes apparent when applied further back in the generations: e.g. 08-146, is a male preceding the subject by 7 (8-1) generations. This ancestor was the father of a woman (146/2=73) (in the ...
The generation number can be calculated as the logarithm to base 2 of the ahnentafel number, and rounding down to a full integer by truncating decimal digits. For example, the number 38 is between 2 5 =32 and 2 6 =64, so log 2 (38) is between 5 and 6. This means that ancestor no.38 belongs to generation five, and was a great-great-great ...
The net reproductive rate is the number of offspring an individual is expected to produce during its lifetime: = means demographic equilibrium. One may then define the generation time T {\displaystyle T} as the time it takes for the population to increase by a factor of R 0 {\displaystyle \textstyle R_{0}} .
Quarters of nobility is an expression used in the bestowal of hereditary titles, and refers to the number of generations in typically an ahnentafel, in which noble status has been held by a family regardless of whether a title was actually in use by each person in the ancestral line in question.
The number of loops is always the number of common ancestors the parents have. If an individual is inbred, the coefficient of inbreeding is calculated by summing all the probabilities that an individual receives the same allele from its father's side and mother's side.
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In a rare experiment that directly measured genetic drift one generation at a time, in Drosophila populations of census size 16, the effective population size was 11.5. [4] This measurement was achieved through studying changes in the frequency of a neutral allele from one generation to another in over 100 replicate populations.
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