SAT Subject Biology Practice Question 312: Answer and Explanation

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Question: 312


Immediately after fertilization, the zygote begins to undergo rapid cell division. This process is known as

A. blastulation
B. gastrulation
C. neurulation
D. implantation
E. cleavage

Correct Answer: E


E Rapid cell division after fertilization is known as cleavage. Blastulation is the formation of a hollow ball of cells (A is wrong), gastrulation is formation of the three primary germ layers (B is wrong), neurulation is development of the nervous system (C is wrong), and implantation is when the morula (solid ball of cells) burrows into the uterine lining (D is wrong).

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