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
62
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/2914560.html
相关试题推荐
Thedesireforachievementisoneoflife’sgreatmysteries.Socialscientis
[originaltext]Whenwethinkofgames,thereareallkindsofthings.Maybeyou’
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]MyfellowSingaporeans:Whatwereyourmostmemorablemoments
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttwenty
[originaltext][12]Intoday’spersonalitystakes,nothingismorehighlyvalued
[originaltext][12]Intoday’spersonalitystakes,nothingismorehighlyvalued
[originaltext][12]Intoday’spersonalitystakes,nothingismorehighlyvalued
[originaltext]Pianosarenormallyfoundinbuildingforobviousreasons.Howeve
随机试题
下列哪一种防火墙的配置方式安全性最高()。A.屏蔽路由器 B.双宿主主机
心绞痛与急性心肌梗死的主要鉴别依据是A.胸痛的部位 B.胸痛的性质 C.胸痛
下列哪项是咳嗽发生的主要病理A.情志刺激 B.脾失健运,痰浊犯肺 C.肺失宣
Thechangeinthatvillagewasmiraculou
某孕妇,30岁。G1P0,孕37周。羊水过多行羊膜腔穿刺术后为该孕妇腹部放置沙袋
Jb6132006.《国家电网公司电力安全工作规程》配电装置发生SF6泄漏时,
地球上的岩石可以分为火成岩、沉积岩、变质岩。由硅酸盐溶浆凝结而成的火成岩构成了地
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
A.γ-羟丁酸 B.枸橼酸西地那非 C.麦角酸 D.吗啡阿托品注射液 E
最新回复
(
0
)