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Changing of an egg into a developing embryo is one of life’s most remarkable development in human.
As an egg develops, it accumulates large mRNAs from the mother because it will not have time to create new mRNAs during the rapid development into embryo.
Messenger RNA (mRNA ) is a large family of RNA molecules that carries genetic information from DNA to the ribosome, where they specify the amino acid sequence of the protein products of gene expression.
The maternal mRNAs are used for a short period of time before the embryo starts synthesizing its own mRNAs. About two to four cell divisions occur before the change.
When fertilized, the egg becomes an embryo, the egg cell becomes active, development starts and it changes into an embryo.