Question

Different results are achieved when an eight-cell sea urchin embryo is bisected horizontally as opposed to when it is bisected vertically. This observation supports which of the following statements?

a. Cellular determinants are equally distributed in the embryo.
b. Differentiation has occurred by the eight-cell stage.
c. Inducers have determined cell fate.
d. Polarity exists in the embryo by the eight-cell stage.
e. None of the above

Answer 1

Polarity exists in the embryo by the eight-cell stage.

Step-by-step explanation:

The cell differentiation may be defined as the process by which the cell attain its specific function. Differentiation occurs in the zygote various time with the help of transcription factors and proteins.

The eight cell sea urchin has been dissected. This embryo shows different result. From this experiment, it can be concluded that the embryo shows the polarity. The polarity is determined at the eight cell stage of the embryo as the results get changed at the eight cell stage.

Thus, the correct answer is option (d).