首页
登录
职称英语
[originaltext] I’ve mentioned how DNA have solved many mysteries in biology.
[originaltext] I’ve mentioned how DNA have solved many mysteries in biology.
游客
2024-01-04
37
管理
问题
I’ve mentioned how DNA have 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. Every winter some green turtles make a 2000 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, 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 question this explanation on the ground that it would be very unlikely that conditions would allowe 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’ve been genetically isolated long enough to have DNA that was very different from the green turtles that nest else where. But when scientists examine 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 this study was a nice example of the usefulness of DNA analysis to biology.
选项
A、To discover how long their ancestors lived.
B、To analyze how their appearance has evolved.
C、To find out how a disease has spread
D、To determine how closely groups of turtles are related.
答案
D
解析
How?is?DNA?used?in?the research?on?green?turtles?
转载请注明原文地址:https://tihaiku.com/zcyy/3332180.html
相关试题推荐
[img]2022m3x/ct_ve01202001m_eillist_0947_220329[/img][br][originaltext](Ethan
[img]2022m3x/ct_ve01202001m_eillist_0947_220329[/img][br][originaltext](Ethan
[img]2022m3x/ct_ve01202001m_eillist_0947_220329[/img][br][originaltext](Ethan
[img]2022m3x/ct_ve01202001m_eillist_0947_220329[/img][br][originaltext](Ethan
[img]2022m3x/ct_ve01202001m_eillist_1293_220329[/img][br][originaltext]Lastly
[img]2022m3x/ct_ve01202001m_eillist_1293_220329[/img][br][originaltext]Lastly
[img]2022m3x/ct_ve01202001m_eillist_0540_220329[/img][br][originaltext]Hello
[img]2022m3x/ct_ve01202001m_eillist_0540_220329[/img][br][originaltext]Hello
[img]2022m3x/ct_ve01202001m_eillist_0540_220329[/img][br][originaltext]Hello
[img]2022m3x/ct_ve01202001m_eillist_0540_220329[/img][br][originaltext]Hello
随机试题
[originaltext]AnenvironmentalgroupcalledtheFoodCommissionisunhappy
社会知觉就是对人的知觉,就是对人和社会群体的知觉,就是对()的知觉。A.工作对
下列降低血糖的激素是A.胰岛素 B.胰高血糖素 C.糖皮质激素 D.生长激
评估风险管理效果是指对风险管理策略的()及收益性情况的分析、检查、修正和
证券产品进场时机选择的要求( )。 Ⅰ.选择进场时机需要积极的投资思维跟进
患者,男,38岁。两手出现皮下小水疱,疱壁破裂,叠起白皮,中心已愈,四周续起疱疹
小青龙汤中不包括的药物是A细辛、干姜 B桂枝、甘草 C半夏、五昧子 D苦杏
企业将活动项目、品牌和产品等信息以网络新闻通稿的方式在门户网站以及行业网站等平台
根据证券法律制度的规定,下列关于非公开发行公司债券的表述中,正确的是()。
早期胃癌是指( )。A.侵及黏膜下层及肌层的癌 B.直径小于2cm的癌 C
最新回复
(
0
)