Tag: "males" at biology news
Jonathon Knight receives ASM Communications Award
...acteria that can infect insect species and convert males
to females for their own reproductive purposes. W...ransmit themselves through the ovaries, so to them males
are useless. Some force sex changes on the males
they infect, while others kill them in the egg to l...
Can we learn about sex from animals?
...heir lives." Book excerpt: ... If we always see males
as the norm, a society in which males
are dominant also becomes normal. We may miss what females do in our own culture and in those of an...
Dog 'model' for studying inherited human blindness
...ale organisms (which have two X chromosomes, while males
have one X and one Y chromosome). Animals -- either human or canine -- with the potential for X-linked disease are considered "normal" if they have none of the defective genes. Females with one defective gene are "carriers" and can transmit potenti...
Tibetans retain resistance to the oxygen-deficient disorder hypoxia regardless of altitude
...onsisted of the following cohorts: Ten lowlander males
born in a sea level environment had not visited a ...issipated after three years. Thirty-three Tibetan males
raised in an environment higher than 10,000 feet had migrated to Shanghai and not returned in the im...
New indicators for predicting hypertension in African-American males
... disproportionately. Background African-American males
are at higher risk for hypertension than other dem...ared to a similar group of 29 non African American males
from staff and students at Columbia and Howard Universities. Potential subjects were screened for ge...
Male starlings sing a song of reproductive fitness
...etence Handicap Hypothesis, or ICHH, proposes that males
of lesser reproductive quality are prevented from ...or song. Choosy females benefit by mating with the males
with the strongest immune systems, because presumably the offspring inherit some of that high immuno...
Popular weed killer disrupts frogs' sexual development
... have normal reproductive systems," he said. "The males
have ovaries in their testes and much smaller vocal organs," which are essential in calling potential mates. It is unclear whether these abnormalities lead to reduced fertility. Hayes now is trying to determine how the abnormalities affect the frog...
Popular weed killer demasculinizes frogs, disrupts their sexual development
...t have normal reproductive systems," he said. "The males
have ovaries in their testes and much smaller voca... animal had such abnormalities. Also, while normal males
at metamorphosis have larger vocal organs than females, the organs of more than 80 percent of males
Social insects could offer clues about genetic conflict
...tic system called haploidiploidy, in which all the males
result from unfertilized eggs. This results in unusual genetic patterns where different groups of siblings and cousins share more genetic links on their fathers side than their mothers, or vice versa. For example, haploidiploid sisters always share p...
Unique social system found in famous Tsavo lions
... are surrounded by teeming herds of game, and lone males
are quickly deposed by coalitions of males
that rule prides in unison. In George Schallers classic study, The Serengeti Lion, none of the 12 pr...
Men regain evolutionary drivers seat
...rial for evolution occur 5.25 times more often in males
than in females. This discovery should lay to rest...ed by recent studies questioning the dominant role males
play in producing mutations for molecular evolution. Their study, published in the April 11 issue of...
...mmichog is not a glamorous fish (although spawning males
sport metallic blue-green spangles and yellow-gold fins); in fact, it is commonly used as bait. Nonetheless, this little bait fish is teaching scientists about something the Navy would like to know more about the effects of environmental contaminant...
Michigan State scientists identify chemical come-on of sea lamprey
...preys migrate into streams to spawn in spring. The males
arrive earlier than the females and build nests. T...les are using the chemical wiles. Discovering that males
are releasing a chemical that is manufactured in their liver and delivered through the gills puts a ...
Progress in the genetics of autism
...transmission than expected as compared to autistic males
(P = 0.007). All together, these data suggest that GluR6 is in linkage disequilibrium with autism. Citation source: Molecular Psychiatry 2002 Volume 7, number 3, pages 302-310. For further information on this work, please contact Dr. Thomas Bourge...
Some animals can recognize degree of kinship by scent
...y related females of various ages (and a few young males
that have yet to leave). o Cooperative territorial defense is important to preserve nest sites and to keep infanticidal adults away from vulnerable young, but fighting can cost injuries or even lives. Risking life and limb for distant kin or unrelat...
Transgenic mice mimic cardiac hypertrophy in humans
...ransgenic strain, and that this held true for both males
and females. The observation of the sex difference led the researchers to administer a drug that blocks the action of estrogen to the female knock-out mice. When this was done, they found that the females soon developed hypertrophy comparable to that...
Are genetics the only reason for high blood pressure among certain hispanic populations?
...dible and his team have examined 700 healthy young males
in Venezuelan to test the notion that high blood p...re the disease affects almost one in four Hispanic males
and approximately one in five Hispanic females. The concern about high blood pressure is related to ...
Kidnapping males could save a species
KIDNAPPING amorous males
who hold a sexual monopoly over their peers may be...restrict access to females, preventing subordinate males
from mating. This can help pass on qualities such as strength to the next generation. But having on...
Battle of the sexes leads to a biological arms race
...e sexes can lead to a biological arms race between males
and females. We all know that males
and females of most animal species look and behave very differently. Males are, for example, often p...
Battle of the sexes leads to evolutionary arms race
... sexes" can lead to a biological arms race between males
and females. The study, to be published in the Feb...aren't easily impressed. These elaborate traits in males
have traditionally been explained as evolutionary consequences of females searching for good fathers...
1 2 3 4 5 6 7 8 9 10