人們早已知道,,某些特定的吸引特征,,比如蟋蟀的鳴叫、孔雀的尾羽等,能夠遺傳給后代,。那么,,作為總體意義上的魅力能否遺傳?英國科學(xué)家近日通過對果蠅的研究證實(shí),,至少在昆蟲當(dāng)中,,魅力確實(shí)可以遺傳。相關(guān)論文11月20日發(fā)表于《現(xiàn)代生物學(xué)》(Current Biology)上,。
領(lǐng)導(dǎo)此次研究的是英國??巳卮髮W(xué)的David Hosken博士。研究人員將雌雄果蠅隨機(jī)配對,,結(jié)果發(fā)現(xiàn),,這些配對的果蠅發(fā)展到交配所需的時間從2分鐘到2小時不等。在果蠅中,,雌性果蠅需要自己主動靠近雄性果蠅才能使交配發(fā)生,,也就是說雄性果蠅無法強(qiáng)迫雌性果蠅交配。因而,,研究人員認(rèn)為,,交配發(fā)生的速度可用來評估雄性果蠅對于雌性果蠅的吸引程度。
實(shí)驗(yàn)中當(dāng)雄性果蠅與周邊的三只雌性果蠅分別交配后,,研究人員將產(chǎn)生的雄性后代,,分別為“親兄弟”或“同父異母兄弟”,與雌性果蠅配對,,并再次記錄交配發(fā)生的時間,。結(jié)果發(fā)現(xiàn),富有魅力的“父親”產(chǎn)生的“兒子”能更快地找到配偶,,即魅力遺傳了,。
之前有研究表明,與富有魅力的雄性交配的雌性并不會產(chǎn)生更多的后代,。那么雌性為什么愛選擇有魅力的雄性呢,?研究人員認(rèn)為,其中的好處可能在于雌性會產(chǎn)生更富魅力的“兒子”,,從而更容易地贏得雌性并產(chǎn)生后代,。
雖然未經(jīng)檢驗(yàn),Hosken認(rèn)為這一研究結(jié)果可以應(yīng)用于其他動物物種,,包括人類,。他說:“很可能魅力在動物界是可遺傳的。甚至可能的是,,在人類中,,最性感的父親會產(chǎn)生最討人喜歡的兒子”。“而這一點(diǎn)”,他又開玩笑說,,“對我的兒子來說可能真是個壞消息,。”(科學(xué)網(wǎng) 梅進(jìn)/編譯)
原始出處:
Current Biology, Vol 17, R959-R960, 20 November 2007
Correspondence
The heritability of attractiveness
Michelle L. Taylor,1 Nina Wedell,1 and David J. Hosken1,
1 Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, Cornwall, TR10 9EZ, UK
Corresponding author
David J. Hosken
[email protected]
Sexual selection is responsible for the evolution of numerous conspicuous and extravagant displays observed in nature — from cricket choruses to peacock's tails. A key assumption of many models of sexual selection is that attractive males father attractive sons1. However, while particular traits under sexual selection have been shown to be heritable [1, 2], the evidence for the heritability of attractiveness per se is far less compelling [1, 3]. This dearth of information has led to disagreement about the existence and importance of this fundamental link between sire and sons' attractiveness [4]. Here we demonstrate in Drosophila simulans that attractive fathers sire attractive sons, as assumed by theory.