Results 11 to 20 of about 157,835 (298)
Postcopulatory sexual selection [PDF]
Nature Reviews Genetics, 2002 The female reproductive tract is where competition between the sperm of different males takes place, aided and abetted by the female herself. Intense postcopulatory sexual selection fosters inter-sexual conflict and drives rapid evolutionary change to ...
A Civetta +132 more
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Variation in apical hook length reflects the intensity of sperm competition in murine rodents. [PDF]
PLoS ONE, 2013 BackgroundPost-copulatory sexual selection has been shown to shape morphology of male gametes. Both directional and stabilizing selection on sperm phenotype have been documented in vertebrates in response to sexual promiscuity.MethodologyHere we ...
Martin Šandera +2 more
doaj +1 more source
Ecology and Evolution, 2022 Sperm cells exhibit extraordinary phenotypic variation, both among taxa and within individual species, yet our understanding of the adaptive value of sperm trait variation across multiple contexts is incomplete.
Jessica H. Hadlow +2 more
doaj +1 more source
Fertility & Reproduction, 2023 Background and Aims: Embryo aneuploidy is caused by many factors, including patient age, sperm quality and sperm selection method. There are several methods for selecting sperm, ICSI (intracytoplasmic sperm injection) and IMSI (intracytoplasmic ...
Reza Raharjo +3 more
doaj +1 more source
No evidence for pre-copulatory sexual selection on sperm length in a passerine bird. [PDF]
PLoS ONE, 2012 There is growing evidence that post-copulatory sexual selection, mediated by sperm competition, influences the evolution of sperm phenotypes. Evidence for pre-copulatory sexual selection effects on sperm traits, on the other hand, is rather scarce.
Jan T Lifjeld +7 more
doaj +1 more source
Microsystems & Nanoengineering, 2023 Sperm selection is an essential component of all assisted reproductive treatments (ARTs) and is by far the most neglected step in the ART workflow in regard to technological innovation.
Steven A. Vasilescu +4 more
doaj +1 more source
The birth of a healthy child in a married couple with a history of multiple unsuccessful attempts at ART by selecting sperm on oocyte-cumulus complexes. Case report [PDF]
Гинекология, 2023 In male infertility, couples must use assisted reproductive technologies with the intracytoplasmic sperm injection (ICSI) technique. A significant disadvantage of ICSI is bypassing natural selection barriers since selective processes in the female ...
Alina V. Chistyakova +5 more
doaj +1 more source
Sperm design and variation in the New World blackbirds (Icteridae) [PDF]
, 2009 Post-copulatory sexual selection (PCSS) is thought to be one of the evolutionary forces responsible for the rapid and divergent evolution of sperm design. However, whereas in some taxa particular sperm traits are positively associated with PCSS, in other
AF Malo +81 more
core +2 more sources
Sperm mobility: mechanisms of fertilizing efficiency, genetic variation and phenotypic relationship with male status in the domestic fowl, Gallus gallus domesticus [PDF]
, 2002 When females are sexually promiscuous, sexual selection continues after insemination through sperm competition and cryptic female choice, and male traits conveying an advantage in competitive fertilization are selected for. Although individual male and
Allen J Feltmann +6 more
core +2 more sources
The evolution of sperm morphometry in pheasants [PDF]
, 2007 Postcopulatory sexual selection is thought to be a potent evolutionary force driving the diversification of sperm shape and function across species. In birds, insemination and fertilisation are separated in time and sperm storage increases the duration
Birkhead, T.R. +5 more
core +3 more sources