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. 2021 Aug 28;22:629. doi: 10.1186/s12864-021-07925-3

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Inference of the independent assortment process during meiosis. (A) “H” denotes the handicapped pig. This barplot showed the fractions of heterozygous/homozygous variations for the H-specific variations and H-nonspecific variations. “H-specific” means appearing in H but not appearing in either M or S. P-value was calculated from Chi-square test. (B) Enrichment of variations in the H-specific group on each chromosome. SNPs and Indels were shown separately. Chromosomes 7 and 17 had the highest enrichment of H-specific variations. As explained in Methods, here the Y-axis is the enrichment = F_Hi/F_Ni, 1 ≤ i ≤ 18 or i = chrX. The horizontal line is Y = 1, which indicates equal frequency among H (H-specific mutations) and N (non-specific mutations) (C) The putative independent assortment process inferred from the enrichment of H-specific variations. For sperms, the handicapped pig inherited a specific set of chromosomes 7 and 17 (colored in red), while the normal offspring inherited another set of chromosomes 7 and 17 (colored in blue). For eggs, the combination was random. Apart from the specific mutations inherited from chromosomes 7 and 17, the handicapped pig might also have de novo mutations. The clipart images are made by ourselves