pedigree collapse

英語（米国） (en-US) 英語（イギリス） (en-GB)

名詞

不可算名詞

(genealogy) The phenomenon in which ancestral inbreeding causes the number of a descendant’s distinct ancestors to be smaller than that predicted by a binary tree (∑ᵢ₌₁ⁿ 2ⁱ, where n represents the number of generations).

日本語の意味

先祖近親交配により、子孫が持つ固有の先祖数が、世代ごとに倍々に増加するという理論上の数（2のn乗の和）よりも少なくなる現象

英語の意味

(genealogy) The phenomenon in which ancestral inbreeding causes the number of a descendant’s distinct ancestors to be smaller than that predicted by a binary tree (∑ᵢ₌₁ⁿ 2ⁱ, where n represents the number of generations).

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Geneticists studying royal lineages often encounter pedigree collapse, where multiple lines of ancestry merge and reduce the number of distinct forebears.

王族の系譜を研究する遺伝学者は、しばしば系図の縮退に遭遇し、複数の血統が合流して本来予測されるよりも異なる祖先の数が減少することがある。

詳細

意味（1）

(genealogy) The phenomenon in which ancestral inbreeding causes the number of a descendant’s distinct ancestors to be smaller than that predicted by a binary tree (∑ᵢ₌₁ⁿ 2ⁱ, where n represents the number of generations).

Less well-known is the argument that we may all have a single mitochondrial foundress — not necessarily a single ancestress — owing to the likelihood of ‘lineage extinction’ and ‘pedigree collapse’ as a result of mating with cousins, small population sizes, and high mortality before reproductive age.

詳細