(1) Background: Fertility preservation allows for trans and non-binary individuals to achieve parenthood using their own gametes. Considering that of gametes can be performed at increasingly earlier ages, it is important analyze both the attitudes youth parents towards available family formation options, including fertility preservation. We aimed explore toward among youth. (2) Methods: A quest...

BACKGROUND Oocyte fertilization and successful embryo implantation are key events marking the onset of pregnancy. In sexually reproducing organisms, embryogenesis begins with the fusion of two haploid gametes, each of which has undergone progressive stages of maturation. In the final stages of oocyte maturation, minimal transcriptional activity is present and regulation of gene expression occur...

We present SLUG, a method that uses genetic algorithms as wrapper for programming (GP), to perform feature selection while inducing models. This is first tested on four regular binary classification datasets, and then 10 synthetic datasets produced by GAMETES, tool embedding epistatic gene-gene interactions into noisy datasets. compare the results of SLUG with ones obtained other GP-based metho...

Mathematical and experimental simulations predict that external fertilization is unsuccessful in habitats characterized by high water motion. A key assumption of such predictions is that gametes are released in hydrodynamic regimes that quickly dilute gametes. We used fucoid seaweeds to examine whether marine organisms in intertidal and subtidal habitats might achieve high levels of fertilizati...

Accurate estimates of gamete and offspring dispersal range are required for the understanding and prediction of spatial population dynamics and species persistence. Little is known about gamete dispersal in fungi, especially in lichen-forming ascomycetes. Here, we estimate the dispersal functions of clonal propagules, gametes and ascospores of the epiphytic lichen Lobaria pulmonaria. We use hie...

Fertilization requires recognition, attachment, and membrane fusion between gametes. In metazoans, rapidly evolving surface proteins contribute to gamete recognition and adhesion. Flowering plants evolved a double fertilization process wherein two immotile sperm cells are delivered to female gametes by the pollen tube, guided by elaborate communications between male and female reproductive orga...

BACKGROUND This paper documents how couples and providers access donor materials for conception in the Indian context and perceptions about using them. The objective is to facilitate understanding of critical issues and relevant concerns. METHODS A postal survey was conducted with a sample of 6000 gynaecologists and in-depth interviews were -conducted with 39 gynaecologists in four cities. ...

The Prader–Willi/Angelman imprinted domain on human chromosome 15q11–q13 is regulated by an imprinting control center (IC) composed of a sequence around the SNRPN promoter (PWS-SRO) and a sequence located 35 kb upstream (AS-SRO). We have previously hypothesized that the primary imprint is established on AS-SRO, which then confers imprinting on PWS-SRO. Here we examine this hypothesis using a tr...

Genomic in situ hybridization (GISH) was applied to study the meiosis of F1 plants from intergeneric hybrids between radish (Raphanus sativus, 2n=18, RR) and cabbage (Brassica oleracea, 2n=18, CC). The result showed that its somatic cells had the expected chromosomes, RC, 2n=18; but the pollen mother cells (PMCs) were different. There were three main kinds of PMCs. The first one was RC (2n=18),...

This paper studies the mutation-selection balance in three simplified replication models. The first model considers a population of organisms replicating via the production of asexual spores. The second model considers a sexually replicating population that produces identical gametes. The third model considers a sexually replicating population that produces distinct sperm and egg gametes. All m...