AP BIOLOGY

Detailed explanation-1: -Euchromatin has a less compact structure, whereas heterochromatin is more compact and composed of an array of nucleosomes condensed into a fiber. These levels of chromatin compaction are illustrated here in two chromosomes (orange and blue).

Detailed explanation-2: -Heterochromatin is densely packed and inaccessible to transcription factors so it is rendered transcriptionally silent (Richards and Elgin 2002). Euchromatin, on the other hand, is less condensed, more accessible, and therefore transcriptionally active (Hennig 1999).

Detailed explanation-3: -Euchromatin is the lightly packed form of chromatin, whereas heterochromatin refers to the condensed form.

Detailed explanation-4: -Chromatin exists in two forms. One form, called euchromatin, is less condensed and can be transcribed. The second form, called heterochromatin, is highly condensed and is typically not transcribed. Under the microscope in its extended form, chromatin looks like beads on a string.

Detailed explanation-5: -Heterochromatin is typically highly condensed, gene-poor, and transcriptionally silent, whereas euchromatin is less condensed, gene-rich, and more accessible to transcription.