Viruses impaired if their targets have diverse genes
When a viral infection spread through five genetically identical mice in a row, the virus replicated faster and became more virulent or severe. But when the infection spread one-by-one through five genetically ...
Lizards and snakes: Less sex + more greens = longer life
Doctors tell us that the frenzied pace of the modern 24-hour lifestyle—in which we struggle to juggle work commitments with the demands of family and daily life—is damaging to our health. But while life ...
Newly identified small-RNA pathway defends genome against the enemy within
Reproductive cells, such as an egg and sperm, join to form stem cells that can mature into any tissue type. But how do reproductive cells arise? We humans are born with all of the reproductive cells that ...
Long-held assumption about emergence of new species questioned
Darwin referred to the origin of species as "that mystery of mysteries," and even today, more than 150 years later, evolutionary biologists cannot fully explain how new animals and plants arise.
Study: Marmoset success with twin gestation
(Phys.org) —How can the tiny marmoset – a New World monkey – regularly successfully bear twins and sometimes triplets and quadruplets when much larger humans often face a difficult pregnancy and delivery?
Resurrecting ancient proteins, team finds just two mutations set stage for evolution of modern hormone signaling
Evolution, it seems, sometimes jumps instead of crawls. A research team led by a University of Chicago scientist has discovered two key mutations that sparked a hormonal revolution 500 million years ago.
Tracing the evolution of forest trees
There are at least 60,000 identified tree species in the world, "but we know next to nothing about how they got here," Elizabeth Stacy says. "Trees form the backbone of our forests, and are ecologically and ...
Two Y genes can replace the entire Y chromosome for assisted reproduction in mice
The Y chromosome is a symbol of maleness, present only in males and encoding genes important for male reproduction. But live mouse offspring can be generated with assisted reproduction using germ cells from ...
Sperm wars: Evolutionary biologist compiles international special issue on sperm competition
Why do male animals need millions of sperms every day in order to reproduce? And why are there two sexes anyway? These and related questions are the topic of the latest issue of the research journal Molecular Hu ...
Study sheds light on 'reinforcement' in wildflowers
Plants or animals using color to attract a mate is fairly common in nature, but for Phlox drummondii, a wildflower commonly known as Drummond's phlox, just the opposite is true.
Researchers test whether Red Queen hypothesis makes species resilient
In Lewis Carroll's 1871 classic novel Through the Looking Glass, the Red Queen tells Alice: "Now, here, you see, it takes all the running you can do, to keep in the same place."
That pregnant feeling makes a fly start nesting
Across the animal kingdom, it's not uncommon for pregnancy to change an expectant mom's behavior. Even female flies have their own rudimentary way of "nesting," which appears to be brought on by the stretch ...
How plants may be evolving to the lack of bees
Plants which used to have two types of male reproductive organs – to increase their chances for fertilisation – are reverting back to one type. And in some cases, they are becoming self-fertilising.
Outdated assumptions make evolutionary researchers ignore female genitalia
(Phys.org) —Animal genitalia are structurally diverse organs that can evolve rapidly under powerful selective forces exerted by the peculiarities of sexual reproduction. An overarching review of the existing ...