求助：一道简单题！

rraauull

< ><FONT size=3>植物基因<FONT face="Times New Roman">AA</FONT>，<FONT face="Times New Roman">Aa,  aa </FONT>比例相同。现与<FONT face="Times New Roman">Aa</FONT>杂交结果如下表，纵坐标表示为结果比例，建模说明<FONT face="Times New Roman">5</FONT>代后情况：</FONT></P>
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<TABLE  cellSpacing=0 cellPadding=0 border=1>

<TR>
<TD  vAlign=top>
< >杂交</P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">AA</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">Aa</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">aa</FONT></P></TD></TR>
<TR>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">AA</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">0.5</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">0.25</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">0</FONT></P></TD></TR>
<TR>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">Aa</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">0.5</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">0.5</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">0.5</FONT></P></TD></TR>
<TR>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">aa</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">0</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">0.25</FONT></P></TD>
<TD  vAlign=top>
<P ><FONT face="Times New Roman">0.5</FONT></P></TD></TR></TABLE></P>
<P ><FONT size=3><FONT face="Times New Roman"> 谢谢你们了<p></p></FONT></FONT></P>