Alexandria Science
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Alexandria Science

How Much of an Ancestor’s or Relative’s DNA Do You Have?

The only cousin statistics that acknowledge the differences in paternal and maternal relatives due to recombination rates.

One million input Poisson rates, normalized, for maternal and paternal recombination.
Table 1. Shared DNA between siblings. Standard deviations for relatives for which values are available in the literature to compare to are given one extra decimal point here to show how closely they approximate known values.
Table 2. Results for shared DNA between six different types of 3/4 siblings. HIR = ‘half-identical regions,’ where one of the two chromosome homologues matches. FIR = ‘fully-identical regions,’ where both copies of a chromosome match. HIR + FIR = all of the points on chromosomes where two people match once plus all of the points where they match on both copies. HIR counting includes FIR bp, but only counts them as if they’re half-identical.
Table 3. Results for double first cousins. All parameters are the same as for Tables 1–2.
Table 4. Results for grandparents or descendants of grandparents. All parameters are the same as for Tables 1–3.
Table 5. Results for descendants of grandparents, continued, for half-relationships. All parameters are the same as for Tables 1–4.
Table 6. Results for descendants of great-grandparents.
Table 7. Results for 2nd great-grandparents.
Table 8. Results for 3rd great-grandparents. All parameters are the same as for Table 7.

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