Tag: "genitalia" at biology news
Defining male and female
...Meeting. At the same time, children with ambiguous genitalia
continue to undergo surgical sex assignment. Baby girls with a condition called congenital adrenal hyperplasia (CAH), for example, may undergo clitoroplasty to reduce male-looking anatomy, as well as vaginoplasty if the labia are fused together. "T...
Certain fish have a special mating preference
...ize was larger, as there is minimal cost for large genitalia
in that environment. Bigger is better for mating,...tors that shape the evolution of body forms. Male genitalia
are more variable than just about any other body form studied, and there is a significant cadre of e...
Size matters: fish genitalia attractiveness vs. predatory escape value
...Academy of Sciences. Variation in the size of male genitalia
in animals that have internal fertilization has long been of interest. While competitive advantages of sperm robustness and other post-mating sexual selection criteria have been widely studied and posed as evolutionary explanations, the roles of pre-...
PNAS highlights for the week of May 16 - 20
... predators, researchers report. Diversity of male genitalia
size in animals with internal fertilization has in...chanisms, such as mating selection favoring larger genitalia
and natural selection favoring reduced size, may also drive genital diversification. --- Rapid Iden...
Like mother, like cubs
...as were hermaphrodites. The characteristics of the genitalia
are responsible for some obvious anatomical challe...es may be helpful in understanding how this unique genitalia
evolved and why it works. Mating that culminates in pregnancy and successful rearing of young is c...
How does one sex grow larger than the other?
...ggs, it may be costlier to produce male gonads and genitalia
than it is to produce female gonads and genitalia. As a result, males might need more time to mature at larger body sizes. This world-wide collaboration developed because most people work and thus have data on only particular animal groups. Wolf B...
Size matters if you're a rodent
...will be catching on any time soon." The study of genitalia
has a long history in evolutionary biology. Because genitalia
evolve very rapidly compared to other body structures, they are often the only means through which s...
Ewwwww! UCLA anthropologist studies evolution's disgusting side
...ransplant organs were appendages like tongues and genitalia
that routinely come into direct contact with the ...he idea of transplanting internal organs. Tongues, genitalia
and anuses ranked the most disgusting, while hips, kidneys and arteries turned the fewest stomachs. ...
'War Between the Sexes': The coevolution of genitalia in waterfowl
...cies of ducks and geese, the authors show that the genitalia
of males and females have dynamically co-evolved w...er exploration of the development and evolution of genitalia
in birds. "I am sure there are more surprises out there," she said! Her further research will ask wh...