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(D) : Satellite $DNA$ is a part of repetitive $DNA$ which consists of long repetitive nucleotide sequences in tandem,forming a separate fraction durin

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shows high degree of polymorphism in population and also the same degree of polymorphism in an individual,which is heritable from parents to children.

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(D) : Satellite $DNA$ is a part of repetitive $DNA$ which consists of long repetitive nucleotide sequences in tandem,forming a separate fraction during density ultracentrifugation.$DNA$ fingerprinting involves identifying differences in specific regions of $DNA$ sequences known as repetitive $DNA$,where a small stretch of $DNA$ is repeated many times.These repetitive $DNA$ sequences are separated from bulk genomic $DNA$ as distinct peaks during density gradient centrifugation.The bulk $DNA$ forms a major peak,while the smaller peaks are referred to as satellite $DNA$.Depending on base composition ($A:T$ rich or $G:C$ rich),segment length,and the number of repetitive units,satellite $DNA$ is classified into categories such as microsatellites and minisatellites.These sequences typically do not code for any proteins,yet they constitute a large portion of the human genome.They exhibit a high degree of polymorphism,which forms the basis of $DNA$ fingerprinting.Since $DNA$ from every tissue (such as blood,hair follicles,skin,bone,saliva,sperm,etc.) of an individual shows the same degree of polymorphism,it serves as a highly useful identification tool in forensic applications.

Satellite $DNA$ is important because it

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