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
2023-08-10
43
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/2914806.html
相关试题推荐
[originaltext]Objectsthatarevibratingmakesounds.Rhythmicsoundvibrations
[originaltext]Inorderforachemicaltobeconsideredadrug,itmusthavethe
[originaltext]Inorderforachemicaltobeconsideredadrug,itmusthavethe
[originaltext]Inorderforachemicaltobeconsideredadrug,itmusthavethe
[originaltext]Hi,everybody.AsIsaidinmyStateoftheUnionaddress,weliv
[originaltext]Hi,everybody.AsIsaidinmyStateoftheUnionaddress,weliv
[originaltext]Hi,everybody.AsIsaidinmyStateoftheUnionaddress,weliv
[originaltext]IntheUnitedStates,manypeopleoncelivedinlarge,two-and-th
[originaltext]IntheUnitedStates,manypeopleoncelivedinlarge,two-and-th
[originaltext]W:2millionhighschoolseniorsaregearingupthisfalltoappl
随机试题
Whogoesfirstandwhofollows,andthe【C1】______towhichwomenare"emancip
施工准备阶段的监理工作方式(手段)及其主要工作内容包括()。A.编制监理计划
改革开放巳推进30多年,那种一个试验区允其“大胆地试大胆地闯”的传统方式,正日
A. B. C. D.
如果允许一个职员单独接触公司装有投资证券的保险柜,可能产生哪种后果?()A.
全面风险管理模式体现了很多先进的风险管理理念和方法,下列选项没有体现的是( )
2020年全国农民工总量28560万人,比上年减少517万人。其中,外出农民工1
2008-71.腰痛的基本病机是 A.外感湿邪,经脉不畅B.筋脉痹阻,腰府
薄膜衣片的崩解时间是A.3min B.30min C.15min D.5m
本人不愿求医,但其对社会人群健康构成危害而被强制求医属于 A.主动 B.被动
最新回复
(
0
)