Choose the correct pairing of characteristics of the unfertilized frog egg and those of the fertilized frog egg.
A) Bilaterally symmetrical: radially symmetrical
B) Gray crescent present: gray crescent absent
C) Diploid: haploid
D) β-catenin throughout the cytoplasm: β-catenin degraded in a certain region
E) Glycogen synthase kinase-3 (GSK-3) inhibited in a certain region: GSK-3 throughout the cytoplasm

Question

Quizplus · Accepted Answer

The presence or absence of the gray crescent, bilaterally or radially symmetrical, and diploid or haploid conditions are not specific to just the fertilized egg or unfertilized egg. However, the distribution of β-catenin and GSK-3 are specific to the fertilized egg. In the unfertilized egg, β-catenin is evenly distributed throughout the cytoplasm, while in the fertilized egg it is degraded in a certain region. Similarly, in the fertilized egg, GSK-3 is inhibited in a certain region while it is found throughout the cytoplasm in the unfertilized egg. Therefore, only option D is correct.

Choose the Correct Pairing of Characteristics of the Unfertilized Frog