首页
登录
职称英语
Founder mutations are a class of disease-causing genetic mutations, each der
Founder mutations are a class of disease-causing genetic mutations, each der
游客
2025-02-19
15
管理
问题
Founder mutations are a class of disease-causing genetic mutations, each derived from its own ancestral “founder" in whom the mutation originated. While most disease-causing mutations are found in humans at a rate of one in a few thousand to one in a few million people, founder mutation can occur at much higher rates. This apparent anomaly is partially explained by the fact that most founder mutations are recessive: only a person with copies of the affected gene from both parents becomes ill. Most people with only one copy of the gene—"carriers"—survive and pass the gene to offspring. Furthermore, the single copy of a founder mutation often confers a survival advantage on carriers. For example, the
hereditary hemochromatosis mutation
protects carriers from iron-deficiency anemia because the mutated gene allows increased efficiency of iron absorption. [br] The author of the passage mentions the "hereditary hemochromatosis mutation" primarily in order to illustrate
选项
A、the circumstances under which a founder mutation fails to cause a disease.
B、how difficult it is to predict the effects of founder mutations on carriers.
C、the difference between harmful founder mutation and those that are beneficial
D、how a single copy of a founder mutation can benefit a carrier.
E、a challenge to a particular theory about the transmission of founder mutations.
答案
D
解析
本题属于功能题,定位句3s版本便是携带创始者突变基因会带来好处,因此选项D正确。A项创始者突变没能导致疾病的条件应该是只有一条基因被继承。B项文中没有提及困难。C项两种突变不符。都是一种创始者突变,有时候带来坏处,有时候带来好处。E项文中未提及。
转载请注明原文地址:https://tihaiku.com/zcyy/3964130.html
相关试题推荐
Foundermutationsareaclassofdisease-causinggeneticmutations,eachder
Foundermutationsareaclassofdisease-causinggeneticmutations,eachder
BiologistsstudyingwildmonkeyssometimesneedthegeneticmaterialDNAfro
Somepeoplethinkthatgeneticallymodifiedplantsmaybeharmfulandshould
Inordertousebioluminescenceinatrans-geneticenvironment,______mustfirs
随机试题
Howwelookandhowweappeartoothersprobablyworriesusmorewhenweare
Please______usofanychangesinyourcircumstanceswhenyouareawayfromhome.
Psychologiststakeopposingviewsofhowexternalrewards,fromwarmpraise
Realinnovationisadyingart.It’struethatcreativity—thebusinessofth
Whichofthefollowingsentencesindicatesasubjunctivemood?A、Notuntilnineo
下列关于技术创新特点的说法中不正确的是( )。A.技术创新不是经济行为,而是一
根据消费税法律制度的规定,下列各项中,不征收消费税的是()。A.酒厂用于交易会样
爆破作业人员应当经设区的市级人民政府()考核合格,取得《爆破作业人员许可证》后
某施工机械的台班产量为500m3,与之配合的工人小组有4人,则人工定额为()。
下列影响建设工程项目质量的环境因素中,属于劳动作业因素的有()。 A.
最新回复
(
0
)