Question

Heterochromatin is chromosomal material that stains___ and remains ____ when other parts of chromosomes, such as euchromatin are otherwise pale and decondensed. Heterochromatic regions replicate____ in ___ and are relatively _____in a genetic sense because there are ____ genes present or if they are present, they are ___.

- deeply
- few
- repressed
- condensed
- late
- inactive
- S phase

Answer 1

Heterochromatin is a densely packed form of DNA that stains deeply, remains condensed in interphase, replicates late in S phase, and is genetically inactive with few, if any, genes present that are often repressed.

Step-by-step explanation:

Heterochromatin is chromosomal material that stains deeply and remains condensed when other parts of chromosomes, such as euchromatin, are otherwise pale and decondensed. Heterochromatic regions replicate late in S phase and are relatively inactive in a genetic sense because there are few genes present or, if they are present, they are repressed. In comparison, euchromatin is less densely packed and usually contains genes that are actively transcribed.

The DNA within euchromatin is arranged around nucleosomes but is not further compacted, facilitating access for enzymes needed for replication and transcription.