منابع مشابه
Why are small males aggressive?
Aggression is ubiquitous in the animal kingdom, whenever the interests of individuals conflict. In contests between animals, the larger opponent is often victorious. However, counter intuitively, an individual that has little chance of winning (generally smaller individuals) sometimes initiates contests. A number of hypotheses have been put forward to explain this behaviour, including the "desp...
متن کاملWhy hybrid males are sterile in Drosophila?
Hybrid male sterility is one of the most rapidly evolving postzygotic reproductive barriers, which has received special attention in the study of speciation. In Drosophila, in majority of interspecific crosses, hybrid males are sterile while females are fertile. Why hybrid males are sterile remains a fundamental question for evolutionary biologists. A number of investigations have been carried ...
متن کاملWhy are males injured more than females?
Everybody who works in the field of injuries knows that after infancy, and before old age, males engage in more behavior that exposes them to the risk of injury, experience more injuries, and die more frequently from injuries. For example, in the US, among 15 to 19 year olds, males are 2.5 times as likely as females to die of any unintentional injury, and about five times as likely to die of ho...
متن کاملWhy Are Bonsai Leaves Small?
where they make those critical decisions that govern their lives. You who garden certainly know that plants have a mind of their own. Given that humans, and the majority of animals, solve many of their stressful problems (say, hunger) with a change in behavior (foraging for food), where are these decisions made in plants? An intriguing, and visually pleasing, example of such decision-making can...
متن کاملWhy Are Autism Spectrum Conditions More Prevalent in Males?
Autism Spectrum Conditions (ASC) are much more common in males, a bias that may offer clues to the etiology of this condition. Although the cause of this bias remains a mystery, we argue that it occurs because ASC is an extreme manifestation of the male brain. The extreme male brain (EMB) theory, first proposed in 1997, is an extension of the Empathizing-Systemizing (E-S) theory of typical sex ...
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ژورنال
عنوان ژورنال: Proceedings of the Royal Society B: Biological Sciences
سال: 2005
ISSN: 0962-8452,1471-2954
DOI: 10.1098/rspb.2005.3085