(2.5 points). Define what is MBT during development of the Xenopus embryo and how is this initiated?

(2.5 points). Define what is MBT during development of the Xenopus embryo and how is this initiated?

(1 point). Embryonic genes that are silenced during development have a posttranslational modification within their promoter regions that promote this silencing. What is this modification and how is it resolved for gene expression.