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
2024-04-01
16
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、Climate.
B、Instinct.
C、Temperature.
D、Salinity.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3536376.html
相关试题推荐
[originaltext]W:Rockstarsnowfaceanewhazard—voiceabuse.[5]Afterlastw
[originaltext]W:Rockstarsnowfaceanewhazard—voiceabuse.[5]Afterlastw
[originaltext]W:Hi,Iunderstandthatthereareaerobicclassesforstudentsa
[originaltext]W:Hi,Iunderstandthatthereareaerobicclassesforstudentsa
[originaltext]I’vementionedhowDNAhassolvedmanymysteriesinbiology.And
[originaltext]Nowwe’vebeentalkingabouttherevolutionaryperiodintheUnit
[originaltext]Nowwe’vebeentalkingabouttherevolutionaryperiodintheUnit
[originaltext]I’dliketolookatavitalaspectofe-commerce,andthatisthe
[originaltext]I’dliketolookatavitalaspectofe-commerce,andthatisthe
[originaltext][13]Americansaresufferingfromaserioussleepdeficitasthey
随机试题
[originaltext]Therearemanyexplanationofwhypeoplecatchcolds.Somesa
血竭来源于A.伞形科 B.棕榈科 C.唇形科 D.橄榄科 E.百合科
阅读《雨巷》教学反思(节选),按照要求答题。 近几年在优质课评选中听过不少老师
下列各项中,不属于皮肤黏膜淋巴结综合征临床表现的是A.持续发热 B.球结膜充血
患者女,28岁。在家娩出一新生儿,体重4kg,产后6小时出现阴道大量流血,急诊入
研究发现,大西洋、太平洋海面水温的微小变化与南美洲亚马逊热带雨林地区火灾的面积具
市场占有率是指()。 A.—个公司的产品销售量占该类产品整个市场销售总量的比
开展异地加工贸易业务,经营企业须向所在地主管海关提出申请,填制《异地加工贸易申请
产成品的运输包装在销售物流过程中将要起到便于()的作用。A.保护 B.仓储
企业出售采用公允价值模式计量的投资性房地产应按照售价与账面价值的差额计入资产处置
最新回复
(
0
)