人類為什么會(huì)有不同的血型-（英語(yǔ)聽力材料）

1、人類為什么會(huì)有不同的血型人類為什么會(huì)有不同的血型（英語(yǔ)聽力材料）（英語(yǔ)聽力材料）音頻下載[點(diǎn)擊右鍵另存為]KaseyonWhyTellmeWhy.Someoneaskedwhyveinsarebluebloodisred.Sothat’spartofthisquestion:whydowehavedifferentbloodtypesBloodtypesareinheritedjustlikeyouinherityoureyecolyo

2、urhairtexturesoyougetagenefromeachparentthatdetermineswhatthechild’sbloodtypeisgonnabe.血型是從父母那里繼承而來。你的基因決定了你是什么血型。There’sstfbloodtypesThereisthereisAtypeAtypeBtypeABtypeO.Theonlydifferenceiswhatsugarmoleculeisaddedtothat

3、point.Sotheyareactuallykindofgeneratefromeachother.血型分為A型，B型，AB型和O型。血型的唯一不同就是其中的抗原分子不同。SofyoutohaveObothofyourparentsmustbeO.AnOcancontributeanO.如果你是O型血，你的父母都應(yīng)該是O型血。也有可能其中一個(gè)是O型。ButiffexampleyourfatherwasAyourmotherwasOhe

4、couldactuallyoneofhisparentsmighthavealsobeenOsohecancontributeeitheranAgeneanOgenethatyoucouldbeOcauseyougetanOfromhimfromyourmotherwhileyoursistermightbeanA.TherearesomestudiesthatshowthatthereasonthatABOABhavebeendist

5、ributedthewaytheywerewasbecauseoffcesthattheythinkofprimarilyconnectedtotheganismthatcausesmalaria.ItturnedouttobethatpeoplewhohadtypeOwereactuallyabletosurviveanattackofmalaria.Itappearedthatmalariaganismwasmereadilyabl

6、etoattachtoredcellsthatweretypeAtypeBactuallykillthosepatientsbefetheyhaveachancetoreproduce.ThosepeoplewhohadtypeOactuallywouldgetsickbutwouldn’tdiehadanopptunitytoreproducethat’showthegenegoesfward.那些O型血的人真的會(huì)得病，但不會(huì)病死，而

7、且還有機(jī)會(huì)傳宗接代。于是O型血的基因就這樣代代相傳下來。thenifyoulookatamapofwheremalariaisnowwherethedifferentpeoplesareyoucanseethatthetypeOwasfollowedthereiswherethere’smalariaABhasgonetocolderclimateswheremalariawasn’taproblemthenABwasjustyoukn