2020-2021学年北师大版八年级上册生物课堂小测6.20.3性状遗传有一定的规律性
※题型：单选题※知识点：单选题※试题难度：较易<br>科学家在育种过程中发现,一定能稳定遗传的性状是( )<br>A.隐性性状 B.显性性状 C.优良性状 D.变异的性状<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/8dfb2a4aef4c4230827dc783a701a566/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/31ca4ad8da704e32acf515a86d34d0ec/152694AB413FAFE1FCD7C6754A37EE7E.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>豌豆的高茎(D)对矮茎(d)为显性,且由一对基因控制。两株高茎的豌豆杂交后,子一代植株中高茎和矮茎的比例是3:1,则亲本的基因组成分别是( )<br>A.Dd和DD B.Dd和dd C.Dd和Dd D.DD和DD<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/3f5259938c0b4416acd9a062c0cc441c/F3FFF02E67737AECAA5F9376DCA7D618.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/7122fe229646468bbe21b409809ae95c/8AF29EA9C690776799A869645EA82BDB.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>人类的肤色正常基因为显性(A),皮肤白化的基因为隐性(a)。白化病人的基因组成是( )<br>A.AA B.Aa C.aa D.a<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/5cc8d2e6dd184fc3b2c9dc1c903bae99/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/72371b8ebf5a458e99312c65bfce2c0f/55DD48211A6D6D0A7E6E1B1906D19E2B.png"><br><br>
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