Question

What protects the egg from being fertilized by sperm of another species?

Answer 1

Fertilization is strictly species-specific, and the egg's coating, the zona pellucida, plays an important role in the binding process between sperm and egg. ... The eggs of ascidians, or sea squirts, members of the chordate subphylum Tunicata, are covered with a thick membrane called a chorion.

Answer 2

Answer:

When the sperm cell finally reaches the egg cell, the plasma membranes of the two cells fuse together and the sperm releases its genetic material into the egg. At this point, fertilization has occurred, but we're not done yet! Fusion also triggers the cortical reaction.

Explanation: