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
2024-03-13
48
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/3530821.html
相关试题推荐
Thedesireforachievementisoneoflife’sgreatmysteries.Socialscientis
Thedesireforachievementisoneoflife’sgreatmysteries.Socialscientis
Thedesireforachievementisoneoflife’sgreatmysteries.Socialscientis
[originaltext]Whenwethinkofgames,thereareallkindsofthings.Maybeyou’
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttwenty
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttwenty
[originaltext][12]Intoday’spersonalitystakes,nothingismorehighlyvalued
随机试题
DuringMcDonald’searlyyearsFrenchfriesweremadefromscratcheveryday.
Afiredrillis,toputitmildly,aninconvenientexerciseatthebestoft
[originaltext][23]SouthAfricaistherichestcountryinAfrica:itisals
ShouldUrbanGrowthbeRestricted?VocabularyandExpressionsrepercussionA
Duringtheearlyperiodofoceannavigat
D左边四个图形可以拼合成如下图形:
下列不属于资格预审的优点的是()A.减少评审费用B.缩短评标时间 C.减少评
党的十八届三中全会作出“使市场在资源配置中起决定性作用”的定位,其意义有()
相关者利益最大化的财务管理目标体现了合作共赢的价值理念。()
继电保护设计时应满足的要求是()。 A.可靠性(信赖性和安全性)、选择性、灵敏
最新回复
(
0
)