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The typical ejaculate is approximately 1 teaspoon in volume. How many sperm cells is this estimated to contain?

 

Is the vaginal environment hospitable to sperm? Why or why not?

 

In what way(s) is the female responsible for helping sperm reach their ultimate goal, the egg cell?

 

How does a sperm cell get through the outermost barrier of an egg cell, the zona pellucida?

 

Even after an egg is fertilized by the sperm, it is estimated that what percentage of all fertilized eggs fail to develop?

 

Define the term blastocyst.

 

Describe the process of gastrulation.