题库网 (tiku.one)

 找回密码
 立即注册

手机扫一扫,访问本页面

开启左侧

Continuity and Change D.8 Inheritance (id: d604696d6)

[复制链接]
admin 发表于 2024-2-8 22:43:38 | 显示全部楼层 |阅读模式
本题目来源于试卷: Continuity and Change D.8 Inheritance,类别为 IB生物学

[单选题]
Which of these statemewq :(,slkw)lw0- wjswnts sx)82l 4tec rgabout genetic disorders is/are correct?

I. The majority of genetic disorders are caused by recessive alleles.
II. Genetic disorders can be sex-linked.
III. Offspring of two parents with the same genetic disease will always be affected.

A. All three
B. II only
C. I and III
D. I and II


参考答案:  D


本题详细解析:
Choice D is correct because statements I and II are both correct for genetic disorders. Dominant alleles cause some genetic disorders, but most are caused by recessive ones (statement I) and some genetic disorders, such as haemophilia, are sex-linked (statement II). If a parent has a genetic disorder that is caused by a dominant allele, they may be heterozygous, so two heterozygous individuals can have a child that is homozygous dominant for the characteristic and they will not have the disease, therefore statement III is incorrect.

微信扫一扫,分享更方便

帖子地址: 

回复

使用道具 举报

您需要登录后才可以回帖 登录 | 立即注册

本版积分规则

浏览记录|使用帮助|手机版|切到手机版|题库网 (https://tiku.one)

GMT+8, 2024-12-26 04:25 , Processed in 0.059906 second(s), 28 queries , Redis On.

搜索
快速回复 返回顶部 返回列表