想問,耳屎點解有d係乾,有d就油?科學上有冇得解釋?

哈, 你個問題好有趣, 唔查資料都唔知, 原來唔係荷爾蒙, 係atp既一個dna突變引起的!!
There are two distinct genetically determined types of earwax: the wet type, which is dominant, and the dry type, which is recessive. Asians and Native Americans are more likely to have the dry type of cerumen (grey and flaky), whereas Caucasians and Africans are more likely to have the wet type (honey-brown to dark-brown and moist).[2] Cerumen type has been used by anthropologists to track human migratory patterns, such as those of the Inuit.[3]
呢個基因顯性係油耳屎, 隱性係乾耳屎, 亞洲人較多乾的. 由於美洲土著都係乾耳屎, 所以人類學家斷定佢地係亞洲人既後代.
The difference in cerumen type has been tracked to a single base change (a single nucleotide polymorphism) in a gene known as "ATP-binding cassette C11 gene". In addition to affecting cerumen type, this mutation also reduces sweat production. The researchers conjecture that the reduction in sweat was beneficial to the ancestors of East Asians and Native Americans who are thought to have lived in cold climates.[4]
油耳屎同乾耳屎係同出汗的基因相同, 即係乾耳屎既人冇咁大汗.
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世伯既乾耳屎係亞洲人的特徵.
快d問下伯母佢係唔係都係油耳屎? 因為油耳屎係顯性, 一定係佢遺傳比你既. 而且你會比世伯多汗. 伯母可能有不是亞裔既祖先, 將呢個基因遺傳比你既... 咁你咪混血兒囉! 好潮呀! =^.^=

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