New research found that males can adjust the speed and effectiveness of their sperm by allocating more or less seminal fluid to copulations. The determining factor is whether the male finds the female attractive. The research revealed that many promiscuous species in the animal kingdom, including humans, can mate with many females, but chances of fertilization are greater when the female is deemed to be attractive. Full Story : Discovery.com….(Continue reading)
Male domination is common among primates including monkeys. But when the number of males increases, females become more strong and dominant. According to researchers, this new finding could true with humans. Male primates are usually larger than females, and it is easier for them to be stronger. But there are times where females dominate, for instance lemurs in Madagascar and macaques.
Findings support that these females are not larger than males, but they dominate due to odds. Chances of wining a fight by a female increases when male aggression is more intense and more males are defeated by other males. Therefore high-ranking females may be victorious over these losers. When females win a fight by chance, they grow more confident and win more fights, and eventually they dominate.
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According to a analysis of the ‚ÄúCollaborative Transplant Study‚Äù, female donor kidneys do not function as well in men, because to their smaller size. Women are at higher risk of rejecting a male donor kidney. Therefore, gender will be considered more in the allocation of donor kidneys in future. Data collected from almost 200,000¬† kidney recipients from 1985 to 2004 analyzed, and transplanting a female kidney was less successful than a male kidney. This is because of female kidneys have fewer nephrons. Immunological rejection problems occurred most frequently when women received a male kidney as well.
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