Jan 11, 2021 10:05 AM
(This post was last modified: Jan 11, 2021 10:36 AM by C C.)
Identical twins don't share 100% of their DNA
https://www.livescience.com/identical-tw...l-dna.html
INTRO: Identical twins form from the same egg and get the same genetic material from their parents — but that doesn't mean they're genetically identical by the time they're born. That's because so-called identical twins pick up genetic mutations in the womb, as their cells weave new strands of DNA and then split into more and more cells. On average, pairs of twins have genomes that differ by an average of 5.2 mutations that occur early in development, according to a new study... (MORE)
Megaladon pups probably grew by hatching in the womb & eating their unborn siblings
https://www.sciencealert.com/megalodon-p...n-siblings
INTRO: Megalodon, the largest species of shark ever to have existed in Earth's history, likely had a somewhat gruesome method for getting a head start in life. According to new research, the pups of the Megalodon shark (Otodus megalodon) are larger than most humans when they're born. This suggests that they hatched in the womb and were born live - and, like modern sharks that give birth to live young, grew by eating their unhatched siblings in utero.
"Results from this work shed new light on the life history of Megalodon, not only how Megalodon grew, but also how its embryos developed, how it gave birth and how long it could have lived," said palaeontologist Martin Becker of William Paterson University.... (MORE)
Study: Oral sex can increase risk of HPV-related oropharyngeal cancer
https://www.news-medical.net/news/202101...ancer.aspx
RELEASE: Human papillomavirus (HPV) can infect the mouth and throat to cause cancers of the oropharynx. A new study published early online in CANCER, a peer-reviewed journal of the American Cancer Society, has found that having more than 10 prior oral sex partners was associated with a 4.3-times greater likelihood of having HPV-related oropharyngeal cancer.
The study also shows that having oral sex at a younger age and more partners in a shorter time period (oral sex intensity) were associated with higher likelihoods of having HPV-related cancer of the mouth and throat.
Previous studies have shown that performing oral sex is a strong risk factor for HPV-related oropharyngeal cancer. To examine how behavior related to oral sex may affect risk, Virginia Drake, MD, of Johns Hopkins University, and her colleagues asked 163 individuals with and 345 without HPV-related oropharyngeal cancer to complete a behavioral survey.
In addition to timing and intensity of oral sex, individuals who had older sexual partners when they were young, and those with partners who had extramarital sex were more likely to have HPV-related oropharyngeal cancer.
"Our study builds on previous research to demonstrate that it is not only the number of oral sexual partners, but also other factors not previously appreciated that contribute to the risk of exposure to HPV orally and subsequent HPV-related oropharyngeal cancer. As the incidence of HPV-related oropharyngeal cancer continues to rise in the United States, our study offers a contemporary evaluation of risk factors for this disease. We have uncovered additional nuances of how and why some people may develop this cancer, which may help identify those at greater risk."
https://www.livescience.com/identical-tw...l-dna.html
INTRO: Identical twins form from the same egg and get the same genetic material from their parents — but that doesn't mean they're genetically identical by the time they're born. That's because so-called identical twins pick up genetic mutations in the womb, as their cells weave new strands of DNA and then split into more and more cells. On average, pairs of twins have genomes that differ by an average of 5.2 mutations that occur early in development, according to a new study... (MORE)
Megaladon pups probably grew by hatching in the womb & eating their unborn siblings
https://www.sciencealert.com/megalodon-p...n-siblings
INTRO: Megalodon, the largest species of shark ever to have existed in Earth's history, likely had a somewhat gruesome method for getting a head start in life. According to new research, the pups of the Megalodon shark (Otodus megalodon) are larger than most humans when they're born. This suggests that they hatched in the womb and were born live - and, like modern sharks that give birth to live young, grew by eating their unhatched siblings in utero.
"Results from this work shed new light on the life history of Megalodon, not only how Megalodon grew, but also how its embryos developed, how it gave birth and how long it could have lived," said palaeontologist Martin Becker of William Paterson University.... (MORE)
Study: Oral sex can increase risk of HPV-related oropharyngeal cancer
https://www.news-medical.net/news/202101...ancer.aspx
RELEASE: Human papillomavirus (HPV) can infect the mouth and throat to cause cancers of the oropharynx. A new study published early online in CANCER, a peer-reviewed journal of the American Cancer Society, has found that having more than 10 prior oral sex partners was associated with a 4.3-times greater likelihood of having HPV-related oropharyngeal cancer.
The study also shows that having oral sex at a younger age and more partners in a shorter time period (oral sex intensity) were associated with higher likelihoods of having HPV-related cancer of the mouth and throat.
Previous studies have shown that performing oral sex is a strong risk factor for HPV-related oropharyngeal cancer. To examine how behavior related to oral sex may affect risk, Virginia Drake, MD, of Johns Hopkins University, and her colleagues asked 163 individuals with and 345 without HPV-related oropharyngeal cancer to complete a behavioral survey.
In addition to timing and intensity of oral sex, individuals who had older sexual partners when they were young, and those with partners who had extramarital sex were more likely to have HPV-related oropharyngeal cancer.
"Our study builds on previous research to demonstrate that it is not only the number of oral sexual partners, but also other factors not previously appreciated that contribute to the risk of exposure to HPV orally and subsequent HPV-related oropharyngeal cancer. As the incidence of HPV-related oropharyngeal cancer continues to rise in the United States, our study offers a contemporary evaluation of risk factors for this disease. We have uncovered additional nuances of how and why some people may develop this cancer, which may help identify those at greater risk."