What evidence below suggested that the sequence of DNA was unimportant in the timing of replication?
A)The inactive,heterochromatized X chromosome in female mammals replicates late in S phase,while the active euchromatic X chromosome replicates at an earlier stage.
B)The inactive,heterochromatized X chromosome in female mammals replicates early in S phase,while the active euchromatic X chromosome replicates at a later stage.
C)The inactive,heterochromatized X chromosome in female mammals replicates late in M phase,while the active euchromatic X chromosome replicates at an earlier stage.
D)Incorporation of radioactive DNA precursors in replicating cells begins over heterochromatic regions in the nucleus.
E)Incorporation of radioactive DNA precursors in replicating cells ends over heterochromatic regions in the nucleus.

Question

Quizplus · Accepted Answer

The fact that the inactive, heterochromatized X chromosome replicates late in S phase while the active euchromatic X chromosome replicates at an earlier stage shows that the timing of replication is not solely determined by the sequence of DNA. If the sequence of DNA was the only factor, both X chromosomes would replicate at the same time.

What Evidence Below Suggested That the Sequence of DNA Was