biology-class-12-unit-05-chapter-03-geneticsevolution-principles-of-inheritancevariation-l-3-7-rwngstvrgws

<div>
<h3 id="successdihybrid-crosssuccess-1"><Success>Dihybrid cross</Success></h3>
</div>
<div style='float: left; width:100%;font-size:30px;text-align:left'>
<ul>
<li>In the original cross, mendel selected plant producing round and yellow seed as male and wrinkled green as female</li>
<li>By continuous self pollination, he produced make the pure breeding plants</li>
<li>Mendel emasculated the wrinkled yellow pea flowers and converted into a female flowers</li>
<li>Bagging of emasculated flowers as well as male flowers</li>
<li>Collection of pollen grains from round yellow seeds</li>
<li>Dusting of pollen grains into the stigma of female flower, followed by bagging</li>
<li>Collection of seeds and sowing</li>
<li>F<sub>1</sub> hybrids are round yellow</li>
</ul>
</div>
<div style='float: right; width:0%;'>
<p><img alt="image" src="https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/biology-class-12-unit-05-chapter-03-geneticsevolution-principles-of-inheritancevariation-l-3_7-rwngstvrgws-06.jpg"></p>
<p><img alt="image" src="https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/biology-class-12-unit-05-chapter-03-geneticsevolution-principles-of-inheritancevariation-l-3_7-rwngstvrgws-07.jpg"></p>
</div>

<div>
<h3 id="successdihybrid-crosssuccess-2"><Success>Dihybrid cross</Success></h3>
</div>
<div style='float: left; width:100%;font-size:30px;text-align:left'>
<p><strong>F<sub>1</sub> on selfing to produce F<sub>2</sub> generation</strong></p>
<ul>
<li>
<p>In the F<sub>2</sub> generation, 9 round yellow, 3 round green, 3 wrinkled yellow and 1 wrinkled green were produced</p>
</li>
<li>
<p>F<sub>2</sub> Phenotypic ratio of a dihybrid cross is 9:3:3:1</p>
</li>
<li>
<p>The genotypic ration is 1:2:1 :: 2:4:2::1:2:1</p>
</li>
<li>
<p>The cross is genetically shown as follows</p>
</li>
</ul>
</div>
<div style='float: right; width:0%;'>
<p><img alt="image" src="https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/biology-class-12-unit-05-chapter-03-geneticsevolution-principles-of-inheritancevariation-l-3_7-rwngstvrgws-07.jpg"></p>
<p><img alt="image" src="https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/biology-class-12-unit-05-chapter-03-geneticsevolution-principles-of-inheritancevariation-l-3_7-rwngstvrgws-08.jpg"></p>
<p><img alt="image" src="https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/biology-class-12-unit-05-chapter-03-geneticsevolution-principles-of-inheritancevariation-l-3_7-rwngstvrgws-09.jpg"></p>
</div>

<div>
<h3 id="successdihybrid-crosssuccess-4"><Success>Dihybrid cross</Success></h3>
</div>
<div style='float: left; width:100%;font-size:30px;text-align:left'>











</div>
<div style='float: right; width:100%;'>
<img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/8ac60450-f755-4d5e-5889-55F1b4a66e00/public" width="60%">

</div>

<div>
<h3 id="successdihybrid-back-crosssuccess-1"><Success>Dihybrid back cross</Success></h3>
</div>
<div style='float: left; width:100%;font-size:30px;text-align:left'>
<p>F<sub>1</sub>  dihybrid × Dominant Parent</p>
<p>(Female- round yellow )RrYy  ×  (Male- round yellow )RRYY</p>
<p>Female - RY Ry rY ry   $\quad \quad \quad \quad \quad$          Male - RY Ry</p>
<table>
<thead>
<tr>
<th>RY</th>
<th>Ry</th>
<th>rY</th>
<th>ry</th>
</tr>
</thead>
<tbody>
<tr>
<td>RRYY(R.Y)</td>
<td>RRYy(R.Y)</td>
<td>RrYY(R.Y)</td>
<td>RrYy(R.Y)</td>
</tr>
<tr>
<td>RRYY(R.Y)</td>
<td>RRYy(R.Y)</td>
<td>RrYY(R.Y)</td>
<td>RrYy(R.Y)</td>
</tr>
</tbody>
</table>
<p>Round yellow in phenotype</p>
<p>Dominant in phenotype</p>
</div>
<div style='float: right; width:0%;'>
<p><img alt="image" src="https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/biology-class-12-unit-05-chapter-03-geneticsevolution-principles-of-inheritancevariation-l-3_7-rwngstvrgws-16.jpg"></p>
</div>

<div>
<h3 id="successreview-questionssuccess-1"><Success>Review questions</Success></h3>
</div>
<div style='float: left; width:100%;font-size:30px;text-align:left'>
<p>(Female )Tall yellow $\quad \quad$ × $\quad \quad$(Male)Tall green</p>
<p>TtYy $\quad \quad$  × $\quad \quad$Ttyy</p>
<p><strong>Gametes</strong>
TY ty</p>
<table>
<thead>
<tr>
<th>TY</th>
<th>Ty</th>
<th>tY</th>
<th>ty</th>
</tr>
</thead>
<tbody>
<tr>
<td>TTYy(T.Y))</td>
<td>TTyy(T.G)</td>
<td>TtYy(T.Y)</td>
<td>Tryy(T.G)</td>
</tr>
<tr>
<td>TtYy(T.Y)</td>
<td>Ttyy(T.G)</td>
<td>ttYy(D.Y)</td>
<td>ttyy(D.G)</td>
</tr>
</tbody>
</table>
<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mstyle displaystyle="true">
    <mfrac>
      <mn>3</mn>
      <mn>8</mn>
    </mfrac>
  </mstyle>
</math> Tall green
<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mstyle displaystyle="true">
    <mfrac>
      <mn>1</mn>
      <mn>8</mn>
    </mfrac>
  </mstyle>
</math> Dwraf green
</div>
<div style='float: right; width:0%;'>
<p><img alt="image" src="https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/biology-class-12-unit-05-chapter-03-geneticsevolution-principles-of-inheritancevariation-l-3_7-rwngstvrgws-18.jpg"></p>
</div>