1. Viruses and chemicals that cause congenital anatomical deformities are called _______________.

2. Aneuploidy is caused by _______________, the failure of two homologous chromosomes to separate in meiosis.

3. The maximum age attained by humans is called the human _______________.

4. For the first 8 weeks after implantation, the conceptus gets most of its nutrition by digesting _______________ cells of the endometrium.

5. Fetal blood flows through growths called _______________, which project into the placental sinus.

6. The enzymes with which a sperm penetrates an egg are contained in an organelle called the _______________.

7. Stiffening of the arteries, joints, and lenses in old age may be due to cross-linking between _______________ molecules.

8. An enlarged tongue, epicanthal folds of the eyes, and mental retardation are characteristic of a genetic anomaly called _______________.

9. The fossa ovalis is a remnant of a fetal shunt called the _______________.

10. A developing individual is first classified as a/an _______________ when the three primary germ layers have formed.

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