[Campbell Biology P.1108] According to Figure 47.21, where are P granules primarily concentra... | Practice Question

According to Figure 47.21, where are P granules primarily concentrated immediately before the first cleavage division in a C. elegans zygote?

  • A: Uniformly distributed throughout the entire cytoplasm.
  • B: At the anterior end of the zygote.
  • C: At the posterior end of the zygote.
  • D: Exclusively in the nucleus.

Explanation

The text explicitly states, "P granules are distributed throughout the newly fertilized egg but move to the posterior end of the zygote before the first cleavage division. As a result, only the posterior of the two cells formed by the first division contains P granules." This indicates their concentration at the posterior pole before the division.