biology-class-12-unit-05-chapter-04-genetics-evolution-principles-of-inheritance-variation-l-4-7-cks7v9jspfe

<h3 id="successincomplete-dominancesuccess"><Success>Incomplete dominance</Success></h3>
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<ul>
<li>Intermediate dominance</li>
<li>Blending inheritance</li>
<li>Mosaic dominance</li>
<li>Partial dominance</li>
<li>When a dominant parent is crossed with a recessive parent, the F1 produces an intermediate phenotype between the two parents</li>
</ul>
<p><strong>Examples</strong></p>
<ul>
<li>Flower colour in <em>Mirabilis Jalapa</em></li>
<li>Flower colour in <em>Antirrhinum Majus</em></li>
<li>Feather colour in <em>Andalusian Fowl</em></li>
</ul>
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<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-04-genetics-evolution-principles-of-inheritance-variation-l-4_7-cks7v9jspfe-04.jpg">
<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-04-genetics-evolution-principles-of-inheritance-variation-l-4_7-cks7v9jspfe-8.jpg"></p>
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<h3 id="successincomplete-dominancesuccess-1"><Success>Incomplete dominance</Success></h3>
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<ul>
<li><strong><em>Mirabilis Jalapa</em></strong>, the four o’clock flower, is the most commonly grown ornamental species of <em>Mirabilis</em> plant</li>
<li>It is available in a range of colours</li>
<li><em>Mirabilis</em> in Latin means wonderful and Jalapa is a common place name in Central and North America</li>
</ul>
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<img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/ccd228cb-59ec-4837-c7f1-bb41647f3700/public" width="45%">
<img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/4075cee9-ac98-45f5-fed5-06558ab17900/public" width="40%">


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<Success>
<h3 id="incomplete-dominance-in-_mirablis-jalapa_-1">Incomplete dominance in <em>Mirablis Jalapa</em></h3>
</Success>
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<ul>
<li>
<p>R gene for red is incompletely dominant over r gene for white</p>
</li>
<li>
<p>Both R and r alleles contribute almost equally in the production of the phenotype pink</p>
</li>
<li>
<p>Genes for red and white do not mix in the F<sub>1</sub> hybrids as both red and white characters appear in the F<sub>2</sub> progenies</p>
</li>
<li>
<p>There is no specific gene for pink flower colour</p>
</li>
<li>
<p>There is no quantitative effect of genes</p>
</li>
<li>
<p>Genotypic and phenotypic ratio remains the same (1:2:1)</p>
</li>
</ul>
</div>
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<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-04-genetics-evolution-principles-of-inheritance-variation-l-4_7-cks7v9jspfe-14.jpg"></p>
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<h3 id="successco-dominancesuccess"><Success>Co-dominance</Success></h3>
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<ul>
<li>
<p>In Co-dominance, the “recessive” & “dominant” traits appear together in the phenotype of hybrid organisms</p>
</li>
<li>
<p>Red × white $\rarr$red & white spotted</p>
</li>
<li>
<p>In Co-dominance, a cross between organisms with two different phenotypes produces offspring with a third phenotype in which both of the parental traits appear together</p>
</li>
</ul>
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<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-04-genetics-evolution-principles-of-inheritance-variation-l-4_7-cks7v9jspfe-26.jpg">
<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-04-genetics-evolution-principles-of-inheritance-variation-l-4_7-cks7v9jspfe-27.jpg"></p>
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