Based on what they knew about the fertilization envelope (a protective layer tha

Question

Based on what they knew about the fertilization envelope (a protective layer that forms around the egg when a sperm fuses with it), Steinhardt, Shatten, and their colleagues hypothesized that changes in the distribution of Ca2+ ions in sea urchin eggs are involved in the formation of the fertilization envelope.

The following images show the changes in fluorescence that occurred after a single sperm entered the egg. The fluorescence of the dye increased with increasing cytoplasmic Ca2+ concentration. The green color indicates the region of the cell with the highest fluorescence at that point in time.

point of sperm entry into eçg sperm nucleus 1 second before fertilization 10 seconds after fertilization 20 seconds after fertilization 30 seconds after fertilization Adapted from Boogy by Campbell and Reece © Pearson Education, Inc. from Biology by Sort the labeled regions of the fertilized egg above based on the status of the ER Ca2 channels and Capumps in that region. Ca2+ channels closed, 2+ pumps operating slow Ca2+ channels closed, 2+pumps operating rapi Ca2+ channels opern reset ? help

Explanation / Answer

at the point of sperm entry , calcium channels are closed and pumps are operating slow

after 10 seconds of sperm entry calcium channels open

after 20 seconds calcium channel close and calcium pumps are operating rapidly.

after 30 seconds channels close and pumps are operating rapidly.

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