Chapter 5 Part 2: Principle of Inheritance and Variations

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<Success><font size="5"><b>Principle of Inheritance and Variations</b></font></Success>
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<h4 id="primarymultiple-choice-questions-mcqsprimary-13"><Primary>Multiple Choice Questions (MCQs)</Primary></h4>
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<p><strong>Sol.</strong> In certain insects, such as cockroach, and some roundworms, the Y-chromosome is missing so that the male has only one sex chromosome, i.e., ’ $X$ ‘.</p>
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<li>The condition in the male is $\mathrm{XO}$ ( $\mathrm{O}$ means absence of one sex chromosome) and in the female it is $\mathrm{XX}$., thus males showing 17 chromosomes while females show 18 chromosome.</li>
<li>All the other option given are wrong.</li>
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<span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions
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<Success><font size="5"><b>Principle of Inheritance and Variations</b></font></Success>
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<h4 id="primarymultiple-choice-questions-mcqsprimary-19"><Primary>Multiple Choice Questions (MCQs)</Primary></h4>
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<p>Continuous traits are often measured and given a quantitative value, they are often referred as quantitative traits, e.g., crop yield, weight, gain in animals, $\mid Q$, etc.</p>
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<p><strong>Polygenic traits</strong> are another exception to mendels rule, which occurs when a trait is controlled by more than one gene.</p>
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<p>This means that each dominant allele adds to the expression of the next dominant allele.</p>
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<p><Success>Sol. to be continued</Success></p>
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<span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions
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<Success><font size="5"><b>Principle of Inheritance and Variations</b></font></Success>
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<h4 id="primarymultiple-choice-questions-mcqsprimary-21"><Primary>Multiple Choice Questions (MCQs)</Primary></h4>
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<p><strong>Ques.</strong> It is said that Mendel proposed that the factor controlling any character is discrete and independent.</p>
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<li>This proposition was based on the</li>
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<p class="fragment">(a) Results of $F_{3}$-generation of a cross <br>
(b) Observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending <br>
(c) Self-pollination of $\mathrm{F}_{1}$ offsprings <br>
(d) Cross-pollination of $\mathrm{F}_{1}$-generation with recessive parent </p>
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<span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions
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<Success><font size="5"><b>Principle of Inheritance and Variations</b></font></Success>
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<h4 id="primarymultiple-choice-questions-mcqsprimary-37"><Primary>Multiple Choice Questions (MCQs)</Primary></h4>
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<p><strong>Ques.</strong> Mother and father of a person with ’ $O$ ’ blood group have ’ $A$ ’ and ’ $B$ ’ blood group respectively.</p>
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<li>What would be the genotype of both mother and father?</li>
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<p class="fragment">(a) Mother is homozygous for 'A' blood group and father is heterozygous for 'B' <br>
(b) Mother is heterozygous for ' $A$ ' blood group and father is homozygous for ' $B$ ' <br>
(c) Both mother and father are heterozygous for ' $A$ ' and ' $B$ ' blood group respectively <br>
(d) Both mother and father are homozygous for 'A' and 'B' blood group respectively </p>
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<span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions
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<Success><font size="5"><b>Principle of Inheritance and Variations</b></font></Success>
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<h4 id="primarymultiple-choice-questions-mcqsprimary-42"><Primary>Multiple Choice Questions (MCQs)</Primary></h4>
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<li>All the four blood groups are controlled by three allelic genes $\mathrm{I}^{\mathrm{A}}, \mathrm{B}, \mathrm{i}$ and thus it shows phenomenon of multiple allelism.</li>
<li>Both $\mathrm{I}^{\mathrm{A}}$ and $\mathrm{I}^{\mathrm{B}}$ is dominant over i.</li>
<li>However, when together, both are dominant and show the phenomenon of codominance forming the blood group AB.</li>
<li>Six genotypes are possible with combination of these three alleles.</li>
<li>Thus, other option are wrong or incorrect.</li>
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<span style="color:blue">Multiple choice questions (MCQs)</span> $\rightarrow$ Very short answer type questions $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions
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<Success><font size="5"><b>Principle of Inheritance and Variations</b></font></Success>
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<h4 id="primaryvery-short-answer-type-questionsprimary-10"><Primary>Very Short Answer Type Questions</Primary></h4>
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<p>(iii) Bagging, i.e., emasculated flowers have to be covered with a bag of suitable size, generally made up of butter paper, to prevent contamination of its stigma with unwanted pollen.</p>
<p>(iv) When the stigma of bagged flower attains receptivity, mature pollen grains collected from anthers of the male parent are dusted on the stigma</p>
<p>(v) The flowers are rebagged and the fruits are allowed to develop.</p>
<p><Success>Ans. to be continued</Success></p>
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Multiple choice questions (MCQs) $\rightarrow$ <span style="color:blue">Very short answer type questions</span> $\rightarrow$ Short answer type questions $\rightarrow$ Long answer type questions
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