例析种子基因型组成问题
<p>被子植物的种子由种皮、胚和胚乳所构成，对于三者的形成与基因型来源是个体发育与遗传变异中的重要交叉考点之一，考生常常因为对这三者的来源缺少总结、解题思路不清楚导致错误。例析如下：</p><p>例题.某雌雄同花植物的基因型为AaBb(两对基因独立遗传)，其所结种子的种皮、胚与胚乳可能的基因型是 ( )</p><p>A.AaBb、AaBb、AaaBBb B.AaBb、AaBb、Aaabbb</p><p>C.AABb、AABb、AAaBBb D.AaBb、AABb、AAabbb</p><p>【知识回顾】种皮、胚与胚乳的来源：</p><p>种皮：由珠被发育而成，其基因组成与母本植株相同;</p><p>胚与胚乳：由双受精形成的受精卵和受精极核发育而来。具体表现为：</p><p>胚：由八核胚囊内的卵细胞与一个精子经过受精作用形成的受精卵发育而来，胚基因型=卵细胞基因+精子基因(说明：对于胚和胚乳细胞的基因组成称为基因型，对于单个生殖细胞的基因组成称为精子基因、卵细胞基因或极核基因，下同);</p><p>胚乳：由八核胚囊内的2个极核(或融合在一起形成的一个中央细胞)与一个精子经过受精作用形成的受精极核发育而成，胚乳基因型=两个极核的基因+精子基因=1个极核基因(卵细胞)+胚基因型。</p><p>值得注意的是：“八核胚囊”中的“八个核”的基因组成相同，即卵细胞与每个极核的基因组成相同;一个“花粉粒”释放的“两个精子”的基因组成也相同。可得如下关系：</p><p>卵细胞(极核)基因=胚乳基因型-胚基因型;</p><p>精子基因=胚基因型-卵细胞基因。</p><p>解题时，可根据选项中的胚与胚乳的基因型，导出精子和卵细胞的基因型，然后再写出胚与胚乳的基因型，进行判断即可。</p><p>【解题过程】由每个选项中胚与胚乳的基因型组成推出卵细胞和精子的基因型，再写出与精子和卵细胞对应的胚和胚乳的基因型(下表)，结合种皮基因型与母本相同(AaBb)即可作出判断。</p><table border="1" cellpadding="0" cellspacing="0" style="BORDER-BOTTOM: black 1px solid; BORDER-LEFT: black 1px solid; BORDER-COLLAPSE: collapse; MARGIN-LEFT: 23.4pt; BORDER-TOP: black 1px solid; BORDER-RIGHT: black 1px solid"><tbody><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 15pt"><td rowspan="2" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 38.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="52"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">选项</span></p></td><td rowspan="2" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="60"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">胚乳</span></p></td><td rowspan="2" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 36pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="48"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">胚</span></p></td><td rowspan="2" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="72"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">卵（极核）基因</span></p></td><td rowspan="2" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="72"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">精子基因</span></p></td><td colspan="2" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 81pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="108"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">可能组合</span></p></td><td rowspan="2" style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 42.1pt; PADDING-RIGHT: 5.4pt; HEIGHT: 15pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="56"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">答案</span></p></td></tr><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 11.25pt"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 36pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.25pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="48"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">胚</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 11.25pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="60"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">胚乳</span></p></td></tr><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 8.75pt"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 38.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="52"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">A</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="60"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AaaBBb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 36pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="48"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AaBb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="72"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">aB</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="72"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">Ab</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 36pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="48"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AaBb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="60"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AaaBBb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 42.1pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="56"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">正确</span></p></td></tr><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 8.75pt"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 38.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="52"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">B</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="60"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">Aaabbb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 36pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="48"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AaBb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="72"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">不包含</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="72"><p align="center" style="LINE-HEIGHT: 16.2pt; TEXT-INDENT: 21pt; LAYOUT-GRID-MODE: char"> </p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 36pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="48"><p align="center" style="LINE-HEIGHT: 16.2pt; TEXT-INDENT: 21pt; LAYOUT-GRID-MODE: char"> </p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="60"><p align="center" style="LINE-HEIGHT: 16.2pt; TEXT-INDENT: 21pt; LAYOUT-GRID-MODE: char"> </p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 42.1pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="56"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">不对</span></p></td></tr><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 8.75pt"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 38.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="52"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">C</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="60"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AAaBBb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 36pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="48"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AABb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="72"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">aB</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="72"><p align="center" style="LINE-HEIGHT: 16.2pt; TEXT-INDENT: 21pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">Ab</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 36pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="48"><p align="center" style="LINE-HEIGHT: 16.2pt; TEXT-INDENT: 21pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AaBb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="60"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AaaBBb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 42.1pt; PADDING-RIGHT: 5.4pt; HEIGHT: 8.75pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="56"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">不对</span></p></td></tr><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 3.5pt"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 38.9pt; PADDING-RIGHT: 5.4pt; HEIGHT: 3.5pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="52"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">D</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 3.5pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="60"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AAabbb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 36pt; PADDING-RIGHT: 5.4pt; HEIGHT: 3.5pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="48"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">AABb</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 3.5pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="72"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">不包含</span></p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 54pt; PADDING-RIGHT: 5.4pt; HEIGHT: 3.5pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="72"><p align="center" style="LINE-HEIGHT: 16.2pt; TEXT-INDENT: 21pt; LAYOUT-GRID-MODE: char"> </p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 36pt; PADDING-RIGHT: 5.4pt; HEIGHT: 3.5pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="48"><p align="center" style="LINE-HEIGHT: 16.2pt; TEXT-INDENT: 21pt; LAYOUT-GRID-MODE: char"> </p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 45pt; PADDING-RIGHT: 5.4pt; HEIGHT: 3.5pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="60"><p align="center" style="LINE-HEIGHT: 16.2pt; TEXT-INDENT: 21pt; LAYOUT-GRID-MODE: char"> </p></td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; WIDTH: 42.1pt; PADDING-RIGHT: 5.4pt; HEIGHT: 3.5pt; BORDER-TOP: medium none; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" width="56"><p align="center" style="LINE-HEIGHT: 16.2pt; LAYOUT-GRID-MODE: char"><span style="FONT-FAMILY: 宋体">不对</span></p></td></tr></tbody></table><p>【答案】A</p><p>【方法小结】对胚与胚乳基因型推理的选择题解法可概括为“三句话”：</p><p>1.胚乳基因型中应包含胚的全部基因，否则，不正确;</p><p>2.胚基因型中应包含卵细胞基因(等于胚乳基因型-胚基因型)和精子基因(等于胚基因型-卵细胞基因)，否则，不正确;</p><p>3.导出的精子和卵细胞基因应包含在亲本体细胞基因型中，否则，不正确。</p>
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