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(D) Polytene chromosomes are giant chromosomes found in the salivary glands of Dipteran larvae (e.g.,$Drosophila$).They are formed by the process of e

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contain endoreduplicated chromosomes.

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(D) Polytene chromosomes are giant chromosomes found in the salivary glands of Dipteran larvae (e.g.,$Drosophila$).They are formed by the process of endoreduplication (or endomitosis),where $DNA$ replication occurs repeatedly without cell division,leading to thousands of chromatids aligned side-by-side.Because of their massive size and the presence of distinct banding patterns (chromomeres),they are extremely useful for gene mapping and studying chromosomal structure.

Column-$I$	Column-$II$
$P$. Metacentric	$I$. One arm shorter and one arm longer
$Q$. Sub-metacentric	$II$. One arm extremely short and one arm extremely long
$R$. Acrocentric	$III$. Terminal centromere
$S$. Telocentric	$IV$. Middle centromere forming two equal arms

Polytene chromosomes in the salivary glands of Dipteran larvae are useful in gene mapping because they ..........

Similar Questions

$A$ repeated cycle of $DNA$ replication without separation of daughter chromatids leads to the formation of

Identify the structure shown below.

Nucleosomes are bounded by

$S -$ Statement: Based on the position of the centromere,chromosomes are classified into four types.
$R -$ Reason: Chromosomes contain a centromere,which is a primary constriction or disc-shaped structure.

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