The end of sexual reproduction: artificial gametes and their implications for society and If electric cars are the answer, what was the question?doi:10.1093/bmb/ldz007VetterNormanBritish Medical Bulletin
1.Gametangium (pl. gametangia) A cell or organ in which sexual cells (gametes) are produced. 1.囊(偶囊):由细胞()产生的细胞或器官。 2.Antherozoid (spermatozoid) The male gamete of algae, some gymnosperms, and the non-seed-bearing plants. 2.藻类,某些裸植物和没有种形成的植物中的雄...
The presence of spermatozoa or oocytes in the oviduct altered the secretion of specific proteins. Most of these proteins are known to have an influence on gamete maturation, viability, and function, and there is evidence to suggest these proteins may prepare the oviductal environment for arrival ...
The difference between diploid and haploid cells is that diploids contain two complete sets of chromosomes and haploids contain only one set of chromosomes. Haploid cells are produced when a parent cell divides twice, resulting in two diploid cells with the full set of genetic material upon the ...
Sex cells are a little different than the other cells in the body, because they serve the unique purpose of creating an entirely new life. As such, they each have only half of the chromosomes of other cells. This allows them to join with the opposite sex cell and create new...
The aim of this current research was to analyze the decision-making process in couples who conceived using donor sperm (DI) or egg donation using qualitative methodologies that we believe are uniquely suited to the comprehensive examination of involved social and personal issues. By conducting in-de...
If segregation distortion is indeed caused by viability selection loci, these loci are themselves of interest because they may help elucidate the mechanism of natural selection and evolution. Mapping the SDL provides reliable statistical parameters that will help to define the viability loci for further...
Are haploid gametes identical? Why is this favored in nature?Meiosis:Meiosis is a specialized form of cell division that occurs within some cells in sexually reproducing organisms to allow for haploid gamete formation. Meiosis begins with a diploid cell that has already undergone DNA replication ...
There are various reasons for the formation of unreduced gametes. In fish and amphibians, the main rea- sons for the high frequency of unreduced gametes are that both fish and amphibians have a propensity to form reproductively successful hybrids, and they undergo external reproduction and ...
the free radical theory of ageing (point 3 above). Mitochondria cannot be producedde novoby the cell, but are inherited through generations, so high mutation rate, oxidative damage and lack of sexual reproduction would lead to the fast accumulation of deleterious mutation, a phenomenon known as ...