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(D) To determine if variations in a character are genetically controlled,one must observe whether these traits are heritable. By crossing individuals

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Cross individuals of both extremes and see if the offsprings and parents show the same range of variations

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(D) To determine if variations in a character are genetically controlled,one must observe whether these traits are heritable. By crossing individuals representing the two extreme phenotypes of a population,we can observe the inheritance pattern in the offspring. If the offspring exhibit the same range of variations as the parents,it indicates that the trait is genetically determined and passed down through generations. This method of breeding and observation is a fundamental approach in classical genetics to distinguish between genetic variation and environmental influence.

List-$I$	List-$II$
$A$. $\text{ABO}$ blood group	$i$. Same phenotypic and genotypic ratio
$B$. Human skin colour	$ii$. Pleiotropy
$C$. Phenylketonuria	$iii$. Multiple allele
$D$. Incomplete dominance	$iv$. Polygenic inheritance

In order to determine whether variations of a character in a population were genetically controlled,the most appropriate procedure will be to

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Match the List-$I$ with List-$II$:

List-$I$ List-$II$

$A$. $\text{ABO}$ blood group $i$. Same phenotypic and genotypic ratio

$B$. Human skin colour $ii$. Pleiotropy

$C$. Phenylketonuria $iii$. Multiple allele

$D$. Incomplete dominance $iv$. Polygenic inheritance

Hybrid vigour is due to

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