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Nonadditive genetic effects induce novel phenotypic distributions in male mating traits of F1 hybrids
Author(s) -
Atsumi Keisuke,
Lagisz Malgorzata,
Nakagawa Shinichi
Publication year - 2021
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/evo.14224
Subject(s) - biology , hybrid , phenotype , genetic variation , phenotypic trait , evolutionary biology , genetics , assortative mating , allele , mating , phenotypic plasticity , epistasis , mating design , quantitative genetics , additive genetic effects , heterosis , heritability , gene , botany
Abstract Hybridization is a source of phenotypic novelty and variation because of increased additive genetic variation. Yet, the roles of nonadditive allelic interactions in shaping phenotypic mean and variance of hybrids have been underappreciated. Here, we examine the distributions of male‐mating traits in F1 hybrids via a meta‐analysis of 3208 effect sizes from 39 animal species pairs. Although additivity sets phenotypic distributions of F1s to be intermediate, F1s also showed recessivity and resemblance to maternal species. F1s expressed novel phenotypes (beyond the range of both parents) in 65% of species pairs, often associated with increased phenotypic variability. Overall, however, F1s expressed smaller variation than parents in 51% of traits. Although genetic divergence between parents did not impact phenotypic novelty, it increased phenotypic variability of F1s. By creating novel phenotypes with increased variability, nonadditivity of heterozygotic genome may play key roles in determining mating success of F1s, and their subsequent extinction or speciation.