The correct answer is- Chromosomes contain many genes; not all genes are actively coding.
Explanation:
Chromosome is the compact form of DNA that contains lots of genes in it that codes for proteins when translated during the translation process.
Some of the genes present in the chromosomes do not code for any proteins like introns that are present between coding sequences called exons. These introns are spliced out during the post-transcription modification of the mRNA.
After splicing out of non-coding introns, coding regions that are exons are joined to form processed mRNA that codes for functional proteins. Therefore, the right answer is-Chromosomes contain many genes; not all genes are actively coding.
