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| For the offspring of half-sibs (Orville), the
coefficient of inbreeding is 1/8. The path connecting Orville's
parents is:
Bud - Sally - Mabel There are three individuals, so the coefficient is (1/2)3, or 1/8. This is the only path between Bud and Mabel, so that's F for Orville or f for Bud and Mabel. Twice this, or 1/4, is the approximate proportion of genes that are identical by descent in Bud and Mabel. |
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| Okay, now are you ready for a more challenging pedigree? The one below shows actual individuals (distant relatives of mine, all now deceased) and their relationships. | |
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| Mary and Margaret are full siblings -- it's
easiest to follow the paths if you draw them from each parent to each
child, as I've done above. Can you figure out Anna's F value?
Try it, then check the answer. |
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