首页
登录
职称英语
Scientists have long speculated as to the extent that inbreeding cont
Scientists have long speculated as to the extent that inbreeding cont
游客
2024-01-11
6
管理
问题
Scientists have long speculated as to the extent that inbreeding contributes
to the decline and eventual extinction of large assimilated populations, most
agreeing that in natural populations the impact of inbreeding depression on
Line population survival is insignificant in comparison to that of demographic and
(5) environmental variables. While there is ample evidence of fitness reduction due
to inbreeding depression in captivity, no field studies on natural populations
have been conducted to test the proposed effect on extinction.
However, Saccheri recently found in his study of a large metapopulation of
the Glanville .fritillary butterfly that extinction risk increased significantly
(10) with decreasing heterozygosity, an indication of inbreeding, even after
accounting for the effects of the relevant ecological factors. Rate of maturation,
larval survival, adult longevity and egg-hatching rate were found to be adversely
affected by inbreeding, and appear to be the fitness components underlying the
relationship between inbreeding and extinction. One wonders, nevertheless,
(15) how applicable these results would be to the increasing number of species with
small isolated populations due to habitat loss and fragmentation. [br] If the phenomenon "extinction risk increased significantly with decreasing heterozygosity" (lines 9-10) agrees with the proposed effect on extinction, the passage assumes
选项
A、heterozygosity is an indicator of increasing inbreeding depression in assimilated metapopulations
B、heterozygosity is unrelated to the degree of inbreeding depression in assimilated metapopulations
C、heterozygosity is an indicator of decreasing inbreeding depression in isolated metapopulations
D、heterozygosity is an indicator of increasing inbreeding depression in isolated metapopulations
E、heterozygosity is an indicator of decreasing inbreeding depression in assimilated metapopulations
答案
E
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3352658.html
相关试题推荐
ScientistsAhavelongBstrugglewithhowtomeasuretheCeffectsofclimatechan
Tothescientists’delight,theireffortshaveincreasedpeople’s___________oft
Untilrecently,scientistsdidnotknowofacloseverte-brateanaloguetothe
Untilrecently,scientistsdidnotknowofaclosevertebrateanaloguetoth
Untilrecently,scientistsdidnotknowofaclosevertebrateanaloguetoth
Untilrecently,scientistsdidnotknowofaclosevertebrateanaloguetoth
Untilrecently,scientistsdidnotknowofaclosevertebrateanaloguetoth
Somesoilscientistshaveassertedthatdecayingmatterontheforestfloorisa
Scientistshaverediscoveredcertainfoodcrops,oncecommonlycultivatedinthe
ThefirstpeopletoinhabitNorthAmericacamefromAsia.Scientistshadhypothe
随机试题
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterp
Thoseuniversitieswereestablishedeitherby__________________(潜心学习的学生团体),as
Whatdoesthecataloguecover?[br]What’stheeffectoftheadvertisementinth
TheHistoryofChineseAmericans[A]Chinesehavebee
某道路工程划分为3个施工过程,在5个施工段组织成倍节拍流水施工,流水节拍分别
欣赏《胡桃夹子组曲》中《进行曲》的A段音乐时,教师采用下面的方法让学生体验音乐主
A. B. C. D.
下列有关克罗恩病的叙述,正确的是 A.回肠末段一般不受累B.病变常弥漫分布于
关于克拉维酸、舒巴坦、他唑巴坦的比较,错误的是A.舒巴坦的抑酶活性比克拉维酸低
某男.51岁,口腔内左颊黏膜有1.5cm×2.0cm珠光白色网状条纹,质地略粗糙
最新回复
(
0
)