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27 Jul The Mancandy FAQ - Rigging - "simple" sperm - Simple Sperm #1. Blender. Loading Unsubscribe from Blender? Cancel Unsubscribe.

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Haploid selection within a single ejaculate increases offspring fitness | PNAS

Description:Nevertheless, some empirical evidence shows that genes may be expressed at the haploid stages of spermatogenesis and that the transcripts of these genes are not always perfectly shared through cytoplasmic bridges among haploid spermatids 9 , Furthermore, the lack of perfect symmetry in sharing of transcripts among haploid cells suggests that phenotypic variation within an ejaculate may have a genetic or epigenetic basis and hence be under selection 11 , In fact, two recent studies suggested a possible link between sperm phenotype and offspring phenotype: In a broadcast spawning ascidian, Styela plicata, longer-lived sperm sired offspring with higher early-life survival 13 , and in the Atlantic salmon, Salmo salar, sperm with intermediate longevity sired faster-hatching offspring However, no published study to date has separated sperm aging from the underlying genetic or epigenetic variation among sib sperm or has provided insights into the long-term fitness effects of variation in sperm phenotypes within a single ejaculate. Therefore our current understanding of the importance of selection at the gametic stage for Darwinian fitness continues to be incomplete.

Views: 2401 Date: 2018-02-14 Favorited: 51 favorites

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