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Fill in the Blanks
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1

During oogenesis, meiosis II only occurs if the egg is .
2

To be able to fertilize the egg, the freshly ejaculated sperm must go through a process called .
3

The average human pregnancy lasts weeks.
4

The most risky stage of prenatal development is the trimester.
5

Once the primary germ layers are formed, the individual is called a(n) .
6

The mesoderm germ layer differentiates to form the fetal connective tissue called .
7

are changes in the structure of DNA.
8

An abnormal number of chromosomes in the zygote is called .
9

The failure of one of the 23 pairs of chromosomes to separate during meiosis I is called .
10

Thalidomide is an agent that causes anatomical deformities, in other words, it is a .







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