与遗传规律有关的基本概念辨析
<p>一 基本概念</p><table align="left" border="1" cellpadding="0" cellspacing="0" style="BORDER-BOTTOM: black 1px solid; BORDER-LEFT: black 1px solid; BORDER-COLLAPSE: collapse; MARGIN-LEFT: 6.75pt; BORDER-TOP: black 1px solid; MARGIN-RIGHT: 6.75pt; BORDER-RIGHT: black 1px solid"><tbody><tr><td rowspan="4" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 21.3pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="28"><p> </p><p> </p><p> </p><p><span style="FONT-FAMILY: 宋体">交<br />配<br />类</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">杂交</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">基因型不同的个体间相互交配的过程，</span><span style="FONT-FAMILY: 宋体">如AA×aa,Aa×AA等。</span></p><p> </p><p><span style="FONT-FAMILY: 宋体">是判断显性性状和隐性性状的主要方法。</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">自交</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">基因型相同的生物间相互交配的过程，如AA×AA,aabb×aabb 等。</span></p><p> </p><p><span style="FONT-FAMILY: 宋体">自交是获得植物纯合子的有效方法。</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">测交</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">杂种子一代F<sub>1</sub>与隐性性状个体杂交。用来测定F<sub>1</sub>的基因型的方法。</span></p><p> </p><p><span style="FONT-FAMILY: 宋体">测交是遗传规律理论假设的验证实验，也可用于鉴定纯合子和杂合子</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">正交和反交</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">对于雌雄同体的生物杂交，若甲♀×乙♂为正交，则甲♂×乙♀为反交。</span></p></td></tr><tr><td rowspan="5" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 21.3pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="28"><p> </p><p> </p><p><span style="FONT-FAMILY: 宋体">性<br />状<br />类</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">性状</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">生物体的形态特征和生理特征的总称</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">相对性状</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">同种生物同一性状的不同表现类型，如人的单眼皮和双眼皮。</span></p><p> </p><p><span style="FONT-FAMILY: 宋体">理解此概念关键要抓住“两个相同”：同种生物、同一性状，“一个不同”：不同表现类型。</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">显性性状</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">具有相对性状的两个纯合亲本杂交，F<sub>1</sub>表现出来的亲本性状</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">隐性性状</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">具有相对性状的两个纯合亲本杂交，F<sub>1</sub>表现没有出来的亲本性状</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">性状分离</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">在杂种后代中，同时显现出显性性状和隐性性状的现象</span></p></td></tr><tr><td rowspan="5" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 21.3pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="28"><p> </p><p><span style="FONT-FAMILY: 宋体">基<br />因<br />类</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">基因</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">有遗传效应的DNA片段，是遗传与变异的结构和功能的基本单位。</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">等位基因</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">位于一对同源染色体的相同位置上，控制着相对性状的基因</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">非等位基因</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">一般是不同对等位基因之间的关系，有位于非同源染色体上的基因和位于同源染色体的不同位置的基因两种情况。</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">显性基因</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">控制显性性状的基因，用大写字母来表示，如A、D等</span></p></td></tr><tr><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">隐性基因</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">控制隐性性状的基因，用小写字母来表示，如a、d 等</span></p></td></tr><tr style="HEIGHT: 9pt"><td rowspan="4" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 21.3pt; PADDING-RIGHT: 5.4pt; HEIGHT: 9pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="28"><p><span style="FONT-FAMILY: 宋体">个体类</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; HEIGHT: 9pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">纯合子</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; HEIGHT: 9pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">由相同基因的配子结合成的合子发育成的个体。</span></p><p> </p><p><span style="FONT-FAMILY: 宋体">纯合子能稳定地遗传，它的自交后代不会发生性状分离。</span></p></td></tr><tr style="HEIGHT: 15.75pt"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">杂合子</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">由不同基因的配子结合成的合子发育成的个体。</span></p><p> </p><p><span style="FONT-FAMILY: 宋体">杂合子不能稳定地遗传，它的自交后代会发生性状分离。</span></p></td></tr><tr style="HEIGHT: 6.75pt"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; HEIGHT: 6.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">基因型</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; HEIGHT: 6.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">与表现型有关的基因组成，如DD、Dd和dd等</span></p></td></tr><tr style="HEIGHT: 14.25pt"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 65.1pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.25pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="87"><p><span style="FONT-FAMILY: 宋体">表现型</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 333pt; PADDING-RIGHT: 5.4pt; HEIGHT: 14.25pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" valign="top" width="444"><p><span style="FONT-FAMILY: 宋体">生物个体表现出来的性状，如豌豆的高茎和矮茎等。</span></p><p> </p><p><span style="FONT-FAMILY: 宋体">表现型是基因型（内因）和环境条件（外因）相互作用的结果。</span></p></td></tr></tbody></table><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p>二 基因、性状等概念之间的联系</p><p> </p><center></center><p> </p><p>三 典型例题剖析</p><p>例1.下列各组生物性状中，属于相对性状的是( )</p><p>A.棉花的短绒和粗绒 B.绵羊的白毛和黑毛</p><p>C.家鸽的长腿和鸡的毛腿 D.豌豆的黄粒和圆粒</p><p>解析：在确定所给出的性状是否为相对性状时，需从三个方面来考虑：①是否是同一生物体的;②是否为同一性状;③是否为不同表现类型。A项中棉花的短绒和粗绒虽是对棉花绒的描述，但一个描述棉花绒的长短，另一个描述棉花绒的粗细，显然它们不属于同一性状。同理，D项描述的豌豆的黄粒和圆粒也不属于同一性状，而C项描述家鸽与鸡不属于同一种生物。</p><p>答案：B</p><p>例2.下列各项中应采取的最佳交配方式分别是( )</p><p>①鉴别一只白兔是否为纯合子 ②鉴别一株小麦是否为纯合子</p><p>③不断提高水稻品种的纯合度 ④鉴别一对相对性状的显隐性关系</p><p>A.杂交、测交、自交、测交 B.测交、自交、自交、杂交</p><p>C.杂交、测交、自交、杂交 D.测交、测交、杂交、自交</p><p>解析：小麦自交可在自然状态下进行，亲代若为杂合子则子代会出现性状分离，很容易鉴别;若测交则需要人工操作，显然自交比测交方案更好。由于纯合子自交能稳定遗传，杂合子自交会发生性状分离，所以利用连续自交的方式，使得杂合子比例逐渐减小，以提高水稻、小麦、豌豆等植物品种的纯合度。要鉴别一对相对性状的显隐性关系，利用不同性状的纯合子杂交，子一代表现出的亲本性状即为显性性状。</p><p>答案：B</p>
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