Question

Describe the features and roles of chromatin regions that are highly condensed, found at centromeres and telomeres, consist of repetitious sequences and are gene-poor, undergo replication in the late S phase, do not undergo meiotic recombination, and are involved in the repression of transcription.

Answer 1

Heterochromatin, found in the regions of the centromere and telomeres, contains genes that are not expressed, while euchromatin, found in the less dense regions, contains genes that are transcribed.

Step-by-step explanation:

In interphase, eukaryotic chromosomes have two distinct regions that can be distinguished by staining.

The tightly packaged region is known as heterochromatin, and the less dense region is known as euchromatin.

Heterochromatin usually contains genes that are not expressed, and is found in the regions of the centromere and telomeres.

The euchromatin usually contains genes that are transcribed, with DNA packaged around nucleosomes but not further compacted.