Which of the following characteristics is sho | vedclass

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(D) Genes located on the $X$-chromosome in males exhibit $X$-linked inheritance. Since males have only one $X$-chromosome $(XY)$,any recessive gene pr

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Colour blindness

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(D) Genes located on the $X$-chromosome in males exhibit $X$-linked inheritance. Since males have only one $X$-chromosome $(XY)$,any recessive gene present on this chromosome will express itself,as there is no corresponding allele on the $Y$-chromosome to mask it. Colour blindness is a well-known example of an $X$-linked recessive disorder. Baldness is typically sex-influenced,while beard and moustache growth are secondary sexual characteristics influenced by hormones. Thalassemia is an autosomal recessive blood disorder. Therefore,the correct option is $D$.

Column-$I$ (Mechanism of Sex Determination)	Column-$II$ (Example)
$P$. $XO$ type	$I$. Grasshopper
$Q$. Haplo-diploid mechanism	$II$. Drosophila
$R$. $XY$ type	$III$. Honey bee

Which of the following characteristics is shown by a gene located on the $X$-chromosome in males?

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$\quad\quad P \quad Q \quad R$

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Match the following columns:

Column-$I$ (Mechanism of Sex Determination) Column-$II$ (Example)

$P$. $XO$ type $I$. Grasshopper

$Q$. Haplo-diploid mechanism $II$. Drosophila

$R$. $XY$ type $III$. Honey bee

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