A fertilized cell is called a(n)__________ when it consists of identical cells that have not begun to take on specific functions,and a(n)__________ once the cells begin to differentiate and form bodily structures and organs.
A)zygote;embryo
B)blastocyst;fetus
C)embryo;fetus
D)blastocyst;embryo

Question

Quizplus · Accepted Answer

A fertilized cell is known as a blastocyst when it consists of identical cells that have not begun to take on specific functions. Once the blastocyst's cells begin to differentiate and form bodily structures and organs, it is known as an embryo. Therefore, option D, blastocyst for the first phase and embryo for the second phase, is the best choice. Option A is incorrect as a zygote is a fertilized egg before it undergoes cell division. Option B is incorrect as a fetus is the stage of development after the embryo stage. Option C is incorrect as it reverses the order - an embryo comes before a fetus.

A Fertilized Cell Is Called A(n)__________ When It Consists of Identical