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arXiv 1709.02563math.PR
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二倍体可交换种群模型的合并结果

Coalescent results for diploid exchangeable population models

Matthias Birkner, Huili Liu, Anja Sturm

摘要:

我们认为二倍体双亲类似物的Cannings模型:在一个人口的固定大小的$N$的下一代是由$V_{i,j}$后代从父母$i$和$j$,其中$V=(V_{i,j})_{1\le i\neq j \le N}$是一个(共同)可交换的(对称)阵列。每个个体都携带两个染色体拷贝,每个拷贝都是从父母中的一个继承的。我们得到一般条件,制定的后代的总数到每个人的向量,适当缩放的祖先过程的收敛的$n$样本的基因对($Ξ$ -)聚结。这补充了Möhle和Sagitov(2001)对单倍体情况的研究结果,并使Möhle和Sagitov(2003)对二倍体情况的研究更加清晰,该研究侧重于固定的夫妇,其中每行$V$最多有一个非零条目。我们将收敛结果应用到几个例子中,特别是Schweinsberg(2003)模型的两个二倍体变体,分别导致两重和四重合并的β-聚结。

英文摘要:

We consider diploid bi-parental analogues of Cannings models: in a population of fixed size $N$ the next generation is composed of $V_{i,j}$ offspring from parents $i$ and $j$, where $V=(V_{i,j})_{1\le i\neq j \le N}$ is a (jointly) exchangeable (symmetric) array. Every individual carries two chromosome copies, each of which is inherited from one of its parents. We obtain general conditions, formulated in terms of the vector of the total number of offspring to each individual, for the convergence of the properly scaled ancestral process for an $n$-sample of genes towards a ($Ξ$-)coalescent. This complements Möhle and Sagitov's (2001) result for the haploid case and sharpens the profile of Möhle and Sagitov's (2003) study of the diploid case, which focused on fixed couples, where each row of $V$ has at most one non-zero entry. We apply the convergence result to several examples, in particular to two diploid variations of Schweinsberg's (2003) model, leading to Beta-coalescents with two-fold and with four-fold mergers, respectively.

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