Which of the following statements are correct | vedclass

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(A) $i$. The $X$ chromosome is larger and contains a significant amount of euchromatin,which is transcriptionally active.$ii$. Heterochromatin is high

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$i$ and $ii$ only

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(A) $i$. The $X$ chromosome is larger and contains a significant amount of euchromatin,which is transcriptionally active.$ii$. Heterochromatin is highly condensed and transcriptionally inactive,making it genetically inert.$iii$. $X$ and $Y$ chromosomes are not entirely homologous; they share only small regions of homology (pseudoautosomal regions) and have large non-homologous regions.$iv$. In females,the sex chromosomes are $XX$. Since they are homologous,crossing over occurs between them during meiosis.Therefore,statements $i$ and $ii$ are correct.

List-$I$ (Type of Inheritance)	List-$II$ (Example)
$A$. Incomplete dominance	$I$. Blood groups in human
$B$. Co-dominance	$II$. Flower colour in Antirrhinum
$C$. Pleiotropy	$III$. Skin colour in human
$D$. Polygenic inheritance	$IV$. Phenylketonuria

Which of the following statements are correct?
$i$. $X$ chromosome has a large amount of euchromatin.
$ii$. Heterochromatin is genetically inert.
$iii$. Both $X$ and $Y$ chromosomes are homologous.
$iv$. Crossing over does not take place in sex chromosomes in females.
Choose the correct option.

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Which of the following statements are correct?$i$. $X$ chromosome has a large amount of euchromatin.$ii$. Heterochromatin is genetically inert.$iii$. Both $X$ and $Y$ chromosomes are homologous.$iv$. Crossing over does not take place in sex chromosomes in females.Choose the correct option.