Around the ages 9-14. On average, 12 is the average age.
• Genes can contain more than one polyadenylation site, which alters the 3' of the mRNA transcript and the inclusion/exclusion of exons.
• mRNA transcripts from the same gene can be differentially spliced to include/exclude exons.
Develop from a single fertilized egg and have identical genes.
It’s because they’re curious or they get peer pressured into doing it to “fit in.”