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During Gastrulation, the blastula folds in on itself to form three layers, the ______, _______ and ______.

The sperm contain enzymes such as ____ that enable the sperm to penetrate the egg:

The blastocyst implants in the uterine wall with the assistance of:

The difference between a phenotype and genotype is that:

After a sperm penetrates an ovum, the sperm nucleus is incorporated into the ooplasm triggering the following action:

The blastocyst must hatch out of the _________ prior to implantation:

Chromosomes 1 through 22 in humans are “non sex chromosomes” otherwise known as 

How does IgG cross the placenta?

What is the embryonic origin of the lining of the digestive tract?

The ______ chromosome is larger than the _______ chromosome, and carries more genes