Fields such as behavioural and evolutionary ecology are built on the assumption that natural selection leads to organisms that behave as if they are trying to maximise their fitness. However, there is considera
Lampreys are sometimes said to pass through an initial female stage or female intersexual stage, because mitosis and meiosis appear to occur in most larvae regardless of future sex. However, meiosis and oocyte growth are more synchronized and extensive in female larvae, and the extent to which ...
One germ cell is selected to become the oocyte and enters meiosis, while the others differentiate into nurse cells that provide support for the oocyte. At the midpoint in the germarium, each cyst becomes encapsulated by a layer of epithelial follicle cells produced by the follicle stem cells ...
In the presence of horizontal gene transfer (HGT), the concepts of lineage and genealogy in the microbial world become more ambiguous because chimeric genomes trace their ancestry from a myriad of sources, both living and extinct. We present the evolutio
further with the limited genetic knowledge acquired by 1926 and the lack of understanding of meiosis in potatoes. He also worked on the breeding of one extremely important trait that was not present in the cultivars being grown in Great Britain, nor in other European countries and North America...
This has led to the development of several large-scale methodologies that are grouped together under the term functional genomics/proteomics, with the aim of investigating the putative gene functions [1–3]. In the context of functional genomics, yeast Saccharomyces cerevisiae has emerged as the ...
As male diploid germ cells resume meiosis only shortly before puberty, there probably is a need to tolerate gamete-expressed antigens that have not been presented at birth. So, to limit immune-mediated damage, systemic immune responses in this compartment are kept in check by the blood-testis ...
The plant-pathogenic fungus Fusarium oxysporum f.sp.lycopersici (Fol) has accessory, lineage-specific (LS) chromosomes that can be transferred horizontally between strains. A single LS chromosome in the Fol4287 reference strain harbors all known Fol effe
YTHDC2 Is Essential for Meiosis in the Male Germline Homozygous Ythdc2−/− males are also infertile, with highly atrophied testes (Figure 3A). Histological examination of the control adult (P60) Ythdc2+/− testes sections reveals large seminiferous tubules full of cells representative of th...
This threshold value of δ is especially relevant since, when drive is limited to the meiosis of one sex (as it usually is), the value of δ for the species, averaged across the two sexes, is necessarily ≤1/2. Taking into account the relative numbers of linked and unlinked loci, Eqs...