首页
登录
职称英语
[originaltext]I’ve mentioned how DNA has solved many mysteries in biology. And
[originaltext]I’ve mentioned how DNA has solved many mysteries in biology. And
游客
2023-08-12
60
管理
问题
I’ve mentioned how DNA has solved many mysteries in biology. And today I want to talk about how it might relate to hypothesis about the travels of the green turtle. [23] Every winter some green turtles make a 2,000 km journey from Brazil to Ascension Island in the middle of Atlantic, where they mate and lay eggs. But the question is why do they travel so far to lay their eggs? One researcher hypothesized that there are two parts to the explanation. One is natal homing, [24] the instinct that drives green turtles to always return to the beach where they were hatched. The second part has to do with continental drift, the theory that the positions of earth continents have changed considerably overtime. Brazil and Ascension Island were once much closer together, and continental drift drove them apart. But the turtles kept on going back to the island where they hatched. However another scientist questioned this explanation on the grounds that it would be very unlikely that conditions would allow generations of turtles over hundreds of millions of years to keep going back to the same nesting ground every single year. So, what is the connection to DNA? Well, there are groups of green turtles that nest in locations other than the Ascension Island. If green turtles always return to the place where they were hatched, then the turtles that have been going to the Ascension Island to nest would have been genetically isolated long enough to have DNA that was very different from the green turtles that nest elsewhere. But when scientists examined DNA from these turtles, their DNA wasn’t that different from the DNA of the turtles that go to Ascension Island. Do you have a shock? Well, we still don’t know the answer to the question about why a certain group of turtles go to Ascension Island, but [25] this study was a nice example of the usefulness of DNA analysis to biology.
1.How far do some green turtles travel to lay their eggs?
2.What drives green turtles to return to the beach according to the theory of “natal homing”?
3.What is proved in this study?
选项
A、DNA can solve all the mysteries in biology.
B、The DNA of two groups of green turtles are totally different.
C、The useless of DNA analysis to biology.
D、The usefulness of DNA analysis to biology.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2920758.html
相关试题推荐
[originaltext]Goodmorning,class.Beforewebegintoday,Iwouldliketoa
[originaltext]Goodmorning,class.Beforewebegintoday,Iwouldliketoa
[originaltext]Inancienttimes,manypeoplebelievedtheearthwasaflatd
[originaltext]Itmayseemstrangethatwe’rediscussingmusicfromaBroad
[originaltext]Thankyouallforcomingtomytalkthisevening.It’snice
[originaltext]Xwasasecretagent.Hehadrentedafurnishedroominapro
[originaltext]Xwasasecretagent.Hehadrentedafurnishedroominapro
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
随机试题
WhichofthefollowingstatementsisTRUEaboutthespeaker?[br][originaltext
[originaltext]W:Willyoutakethesebookstothelibraryduringyourlunchhou
Thepopularnotionaboutmarriageandloveisthattheyaresynonymous,tha
分项工程应按主要()等进行划分。A.工种B.材料C.施工工艺D.设备类别
根据有效市场假说,下列关于有效市场形态的说法中,错误的是( )。A.在强式有效市
共用题干 TheOniyWayIsUpThinkofamodem
慢性肾小球肾炎的主要致病因素是A.链球菌直接感染 B.病毒直接感染 C.免疫
教学环境包括物质环境和()环境两部分,后者涉及课堂纪律、课堂气氛、师生关
8月6日18时,驾驶员甲驾驶装满液氯的槽罐车驶入某高速公路B56段,20时许,槽
水泥砂浆面层抹面、亚光后,应在常温条件下经一定时间的凝结再进行养护,通常夏季的间
最新回复
(
0
)