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
4
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://www.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
[originaltext]Milkwasabasicfoodofmanlongbeforehistorywaswritten.
TheGlobalEconomyOfallthesciences,onlytwoare
InWashingtonD.C.,1600PennsylvaniaAvenueisaveryspecialaddress.It
[originaltext]W:Goodmorning.M:Goodmorning.Comeinplease.HowcanIhelp
Cryingishardlyanactivityencouragedbysociety.Tears,betheyofsorrow
工程设计资质一般分为( )。 A、工程设计综合资质 B、工程设计行业资质
下列关于医师良心具有的特点不包括()A.是多种道德心理因素在个人意识中的
能客观地反映过去3个月内平均血糖水平的指标是()A.HDL-C B.Hb
空调的设备功率应取()。A.40kW;B80kW;C120kW。
根据《民法典》规定,下列关于建设用地的使用说法正确的是()。A.建设用地使用权人
最新回复
(
0
)