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Figure 2.14 Average relatedness and autozygosity as the probability that two alleles at one locus are identical by descent. (a) A pedigree where individual A has progeny that are half-siblings (B and C). B and C then produce progeny D and E, which in turn produce offspring G. (b) Only the paths of relatedness where alleles could be inherited from A, with curved arrows to indicate the probability that gametes carry alleles identical by descent. Upper-case letters for individuals represent diploid genotypes and lower-case letters indicate allele copies within the gametes produced by the genotypes. The probability that A transmits a copy of the same allele to B and C depends on the degree of inbreeding for individual A, or FA.

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