The term sperm refers to the male reproductive cells. In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell.
The discovery that zinc is involved in the fertilization process earlier than initially thought was made with the help of the Bionanoprobe, a cutting-edge instrument at Argonne.
The majority of chromosomes have existed for millions of years.
Large parts of the human genome were changed over a million years ago due to a random event during egg or sperm formation that resulted in the deletion, duplication, or reversal of sections of DNA. Investigators have demonstrated that those structural variants likely set off a cascade of other fast alterations in human DNA that may underpin unique human traits, particularly the brain.
Among families with children diagnosed with autism spectrum disorder, Johns Hopkins University researchers say they have found a link between chemical "marks" on DNA in the sperm of fathers and autistic traits in their 3-year-old children.
As far as a highly effective, reversible, and non-hormonal male contraceptive for humans and animals is concerned, the discovery of a gene in multiple mammalian species could set the stage.
Male yellow crazy ants (Anoplolepis gracilipes) are chimeras of two separate genetic lineages, researchers report in a study that reveals a unique mode of reproduction in this species – one previously unknown to science.
Male beetles face a trade-off between competing with other males for mating opportunities and repairing damage to their sperm DNA, according to a study publishing April 4th in the open access journal PLOS Biology by Mareike Koppik from Uppsala University, Sweden, and colleagues.
A higher risk of reproductive and child health issues is linked to advanced paternal age. Increasing evidence points to age-related alterations in the sperm epigenome as one underlying cause.
New UC Riverside research makes it likely that proteins responsible for activating mosquito sperm can be shut down, preventing them from swimming to or fertilizing eggs.
Cell division is the process through which the majority of cells in the bodies of living beings duplicate their contents and physically split into new cells.
Different types of cells, such as the heart, liver, blood, and sperm cells, have characteristics that help them perform their specific functions in the body. In general, those traits are hard-wired. A heart cell will not randomly transform into a liver cell if not stimulated.
The February 2023 issue of SLAS Technology contains a set of four original research articles and one review article covering digital microfluidics (DMF), cryopreservation, colorectal cancer research and other laboratory automation technology.
An experimental contraceptive drug developed by Weill Cornell Medicine investigators temporarily stops sperm in their tracks and prevents pregnancies in preclinical models. The study, published in Nature Communications on Feb. 14, demonstrates that an on-demand male contraceptive is possible.
Malaria is known as a disastrous disease, with 247 million cases and 619,000 deaths reported in 2021 alone.
New research reveals the genes that likely allowed whales to grow to giant sizes compared to their ancestors, reports a study published in Scientific Reports.
The male reproductive system is a hotspot for the introduction of new genes. Perhaps that might assist in understanding why fathers tend to pass on more new mutations than mothers do. However, it does not explain why older fathers pass on more mutations than younger fathers.
Florida State University College of Medicine researchers have linked aspartame, an artificial sweetener found in nearly 5,000 diet foods and drinks, to anxiety-like behavior in mice.
A team of researchers discovered that the activity of sperm cells is attributable in part to the individual DNA make-up of these cells, rather than just male genetics.
Corals bred in public aquaria provide novel research opportunities and a healthy stock for outplanting into the wild, essential components of a thriving future for coral reef ecosystems, which support around 25% of all life in Earth's oceans.
Sperm cells have compact bundles of DNA, yet exactly how and why sperm cell nuclei are condensed in flowering plants has been a mystery, until now.