Articles tagged with Sexual Reproduction
Research finds that meiosis, a key process in sexual reproduction, takes a heavy toll on offspring viability, affecting various organisms including humans and non-human animals. The study suggests that the advantages of sex must outweigh its drawbacks to be advantageous for evolution.
The International Partnership for Microbicides (IPM) has received a four-year, £12 million UK government award to develop and commercialize new HIV prevention products for women. IPM's dapivirine vaginal ring, approved in two large clinical trials, will receive regulatory support.
Early menstruation is linked to earlier age of sexual initiation, pregnancy and marriage in low- and middle-income countries. Girls who menstruate before age 14 are more likely to engage in sexual intercourse and get married at a younger age.
Research found that nearly 1,400 US servicemen sustained genitourinary (GU) injuries during the Iraq and Afghanistan wars. The majority of patients suffered severe testicular and/or penile injuries, often part of polytraumatic injuries. Novel treatments are needed to address long-term sexual and reproductive health concerns.
A Johns Hopkins Medicine study found that social ecology influences on personal experiences and interactions with family, peers, and healthcare providers hinder young men's use of sexual and reproductive health care. Long wait times, costs, and concerns about privacy also deter seeking care.
A Kyoto University research team found that males can 'cost' less when there are more females, increasing the competitiveness of sexual reproduction. This discovery may have implications for studies on the evolution and sustainability of sex in nature.
A study of freshwater snails found that asexuality, rather than polyploidy, is the key to their rapid growth and reproductive success. The researchers discovered that asexual females grew twice as fast and reached reproductive maturity 30% faster than sexual females.
Fruit flies have evolved protective armor plates in their reproductive tract to shield against rough male genitalia, while females also employ a 'cross-dressing' strategy by darkening their skin to evade male attention. This study explores the genetic controls behind these strategies and their survival value.
Female guppies that experience high levels of male harassment in the wild learn to swim more efficiently, reducing energy costs and improving escape abilities. This physiological change is comparable to human athletes' adaptations to their sports.
A European-US consortium led by Instituto Gulbenkian de Ciencia aims to understand the evolution of plant reproduction, including ancient mechanisms of gamete development and fertilization. The project will identify genes useful to agriculture, increasing crop yield and food security.
A recent study by the University of Gothenburg has found that starfish that reproduce through cloning have better health and longer lifespans than those that undergo sexual reproduction. This is due to the regulation of telomeres, which are crucial for an individual's lifespan.
Researchers found that sexually reproducing species are healthier and less likely to accumulate deleterious mutations over time. The study used the evening primrose plant as a model, comparing 30 pairs of species with different reproductive methods, revealing strong support for the theory that sex is beneficial for health in plants.
A new review critically examines the relationship between genital anatomy, sexual arousal, and brain stimulation to understand women's sexual pleasure. The study aims to stimulate more exacting research into human female sexual functions, particularly regarding procreation and recreation.
A new study published in the Endocrine Society's Journal of Clinical Endocrinology & Metabolism suggests that testosterone has a limited impact on menopausal women's interest in sex and sexual function. Psychosocial factors such as emotional well-being and intimate relationships are found to be stronger contributors to sexual health.
A recent study published by the American Psychological Association found that white, straight women are more likely to seek fertility help than racial or sexual minority women. Lack of insurance is a significant factor in lower rates of fertility assistance for lesbian and bisexual women, especially in recent years.
A new study advocates for investing in the sexual and reproductive health of 10 to 14 year olds, a critical period of transition from childhood to adulthood. Researchers recommend tailored programs to meet their unique needs, including parental and guardian involvement, and preventive services to prevent misinformation and promote heal...
Scientists have confirmed the presence of a new fungus variant in Alava, Spain, which may be more resistant to conventional fungicides. This discovery could lead to the emergence of more aggressive strains of Phytophthora infestans, causing further damage to potato crops.
Women who underwent bariatric surgery reported significant improvements in overall sexual function, including desire, arousal, lubrication, and satisfaction. Additionally, they experienced gains in reproductive hormones and psychological status.
Women who underwent bariatric surgery experienced significant improvements in sexual functioning, including arousal and satisfaction, as well as better reproductive hormone levels and reduced depressive symptoms. They also reported improved body image after weight loss.
Mycobacteria have developed a new process called Distributive Conjugal Transfer, which allows them to mix genomes like sexual reproduction. This process enables the creation of patchwork genomes with benefits such as increased variation and adaptability.
The latest themed issue of Reproductive Health Matters explores the unmet needs of adolescents regarding reproductive health, sex education, and relationships. Papers from around the world address key issues such as HIV misinformation, menstrual health, and safe abortion services.
A new study found that rural Latino men require specialized sexual health services due to language barriers, cultural assumptions, and limited access. The research team suggests improving services by providing male providers, bilingual staff, and convenient clinic hours, as well as addressing terminology and cultural nuances.
Candida albicans, a common human fungus, has been found to possess the ability of sexual reproduction through haploid isolates. This breakthrough could provide insights into how it evolves and transform from harmless to deadly. The discovery also paves the way for genetic studies and potentially modified diploid strains.
Researchers have discovered a method to induce sexual reproduction in Penicillium chrysogenum, leading to the development of new strains with improved industrial characteristics. This breakthrough aims to increase penicillin production, making it cheaper to produce, and potentially applicable to other economically important fungi.
Researchers have discovered that the penicillin-producing fungus Penicillium chrysogenum reproduces sexually through a two-gender cycle. This leads to strains with new properties, including high penicillin production without contaminating genes.
The latest issue of Reproductive Health Matters exposes the significant impact of neglected sexual and reproductive morbidities on women, men, and families globally. It addresses various health issues, including fistula complications, maternal health, and cervical cancer, while also highlighting prevailing myths and misconceptions.
Women undergoing IVF report decreased sexual desire, interest in activity, and satisfaction with their relationship, as well as increased difficulty with orgasm and pain
A study by University of Edinburgh researchers found that sexual reproduction allows for the weeding out of damaging DNA elements within a few generations. This leads to healthier individuals flourishing and passing on their DNA, while weaker ones are more likely to die without reproducing.
A new paper finds that emphasis on quick impact interventions has diverted resources away from the neediest patients, with the poorest people seeing little progress. The study highlights the need for medium-term and long-term strategies to achieve inclusive and equitable progress in global reproductive health.
Recent studies published in Cell Transplantation suggest a link between exercise, brain cell regrowth, and improved mental health. Exercise has been shown to promote neurogenesis, which may help counteract stress-related disorders and improve mood and cognition.
Trypanosomes, a distant branch of the eukaryote tree, have been found to reproduce sexually through meiosis, a process previously thought unclear. The study uses fluorescently-tagged proteins to visualize the process inside the tsetse fly.
Researchers discovered that black truffles outcross, meaning they have opposite mating types and engage in sexual reproduction. This finding challenges the long-held assumption that truffles reproduce through self-fertilization alone.
A study by University of Toronto researchers found that species in spatially heterogeneous environments have higher rates of sexual reproduction. Sexual reproduction resulted in organisms with better adaptability and robust genetic constitutions.
A nationwide survey of over 5,800 individuals ages 14 to 94 found diverse patterns of sexual acts, condom use, and same-sex encounters. Condoms were used by one in four men and one in three women, with increased usage among some groups.
Recent studies have uncovered surprising parallels between pheromone signaling in bacteria and fungi, suggesting a close link between microbial sex and virulence. The review highlights the role of telesensing in regulating genetic exchange and potential virulence factors in opportunistic pathogens.
The importance of full reproductive and sexual health rights cannot be overstated when it comes to achieving international health goals aimed at improving maternal health. Access to family planning resources, including contraception and abortion, is vital for women's empowerment and control over their lives.
A new study reveals that the chemical mediator for sexual reproduction in rotifers is progesterone, a molecule also found in humans and plays a vital role in regulating reproduction. The research has significant evolutionary implications and sheds light on how environment, metabolism, hormones, and behaviors interact.
A recent study published in Molecular Biology and Evolution found that sexually reproducing organisms accumulate fewer harmful DNA mutations than asexually reproducing ones. This suggests that sexual reproduction provides a protective advantage against genetic damage.
Researchers found that young adults in casual relationships do not experience higher levels of emotional distress compared to those in committed relationships. The study surveyed over 1,300 young adults and found a lower percentage of males reporting casual sexual encounters.
In the Caribbean Sea, environmental changes led to a shift from clonal to sexual reproduction among cupuladriid bryozoans. This shift enabled species to survive by becoming more robust against fragmentation, while those that failed to adapt went extinct.
A new theory in evolutionary biology proposes that sex promotes genes' ability to perform well with many partners rather than just one specific set of genes. This idea, called genetic mixability, finds that sexual reproduction favors genes that work well across multiple variations.
The May 2008 issue of Reproductive Health Matters explores the gendered dimensions of disaster in conflict and crisis settings. The article highlights the urgent need for a new humanitarian paradigm that prioritizes the needs and solutions of displaced communities, led by women, to survive and rebuild.
Research reveals that reindeer males use their inflated air sacs to produce unique, high-pitched rutting calls that signal their fighting ability and attractiveness to females. This adaptation allows males to conserve energy while deterring rivals and attracting mates.
Margaret Chan takes over as WHO Director-General on January 4, 2007, with a daunting task of prioritizing programs amidst widespread failures in malaria, tuberculosis, HIV-AIDS, child mortality, and maternal health. The Lancet Editorial highlights her need to create an operational team that commands confidence from member states.
The study found that monogamy is the dominant pattern globally, but multiple partnerships are more common in industrialized countries. Rates of condom use vary widely by country and region, with increasing trends in some areas.
The Lancet warns that conservative forces are undermining progress in sexual and reproductive health, resulting in 19 million women facing unsafe abortions, 80 million couples having unmet contraceptive needs, and 340 million new cases of gonorrhoea, syphilis, and chlamydia each year. Effective measures to prevent unintended pregnancy,...
Cost-effective interventions can be scaled up with a focus on local context modification, training of non-physician healthcare personnel, and linking HIV/AIDS services. Revitalizing political commitment through NGOs presenting evidence to policymakers and economic arguments can also drive progress.
Ricardo Azevedo's study using a computational model suggests that sexual reproduction can lead to the evolution of negative epistasis, which confers an evolutionary advantage on sexually reproducing organisms. This finding implies that sex may be self-reinforcing, leading to increased robustness in populations.
A new study found that breeding Zambian mole-rats lived up to 20 years and twice as long as non-breeding individuals. The researchers suggest this could be due to the species' eusocial lifestyle and pair-bonding habits, making it a valuable model organism for studying aging mechanisms.
Research using Daphnia pulex reveals that sexual reproduction efficiently removes deleterious gene mutations, suggesting it is a key mechanism for maintaining population health. Asexual species, in contrast, accumulate bad mutations at an increased rate, supporting the idea that sex plays a crucial role in purifying genomes.
A study by John Chambers found that individuals view their opponents' arguments as attacks on their core values, leading to intense conflicts. Despite perceived disagreements, groups often agree on issues important to the other side.
Researchers at Duke University Medical Center have found that members of the same sex can mate and produce offspring in the infectious fungus Cryptococcus neoformans. This novel type of sexual cycle allows for genetic exchange between individuals, potentially providing an advantage for the fungus.
Researchers found that ant queens benefit from mating, gaining increased lifespan and reproductive success. Sexual cooperation rather than conflict promotes this benefit in social insects, allowing queens to experience a long reproductive phase after colony maturity.
A new study shows that C. elegans progeny derived from sexual reproduction can undergo sex change after birth to better survive chemical changes in the environment and shortages of food. This development allows for increased survival flexibility and gene expression, suggesting that sex is a beneficial strategy for this species.
Research finds that mutant bacteria respond differently to stress than previously thought, with stresses alleviating deleterious mutation effects. The study challenges the long-held assumption that stress always harms an organism's ability to tolerate mutations.
Researchers found that genistein exposure during pregnancy and lactation can lead to smaller testes and larger prostates in male offspring, as well as lower testosterone levels and decreased fertility. The study suggests potential long-term detrimental effects on male reproductive development, warranting further investigation.
A study by Dr. Ron Randel found that fall-born Brahman bulls take longer to reach sexual maturity than spring-born bulls, delaying breeding by up to 39 days. This delay has little impact on long-term reproductive efficiency, but affects commercial cattle producers who buy young bulls for early use.
A recent study by UC Santa Barbara scientists found that sexual reproduction outperforms asexual reproduction in terms of progressive evolution and genetic diversity. This is because sexual reproduction allows for greater genetic variation and mixing, which accelerates the accumulation of beneficial mutations.
Measuring the levels of inhibin-a and inhibin-b in older women shows a more sensitive test for reproductive potential compared to FSH. The research found that inhibin levels drop as women approach menopause, indicating a direct measure of ovarian function.
Sexual reproduction in brewer's yeast found to be better at removing harmful genetic mutations than single-sexed populations. This could explain why humans and other vertebrates evolved to have two parents instead of cloning themselves.