At which stage of human development does cell differentiation begin? Select one:
a. blastocyst
b. egg
c. zygote
d. infancy

(c) zygote is the answer

Explanation:

How does a single cell develop into many different types of cells? During the third week after fertilization, the embryo begins to undergo cellular differentiation. Differentiation is the process by which unspecialized cells become specialized.

before it leaves the nucleus of a eukaryotic cell, mrna is altered in the following ways: - a cap is added to the 5' end of the mrna molecule; - a poly a tail is added to the 3' end; - introns are removed and exons are spliced together.

identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.