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Exam 20: Development and Inheritance

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Question 31

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The slender projections that grow out from the trophoblast into the uterine wall are called _________________________.

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Question 32

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Using the figure above, identify the labeled part. -Label C: ________

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Question 33

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The ductus venosus is a fetal vessel that functions to transport blood from the umbilical vein to the

Using the figure above, identify the labeled part. -Label E: ________

If an individual carries a pair of alleles that are the same, he or she is ________ for the trait.

The cells of a blastocyst that give rise to the placenta are the

The hormone that is the basis for an ovulation test is

_________________________ is a technique in which a sample of amniotic fluid is analyzed to determine the presence of genetic defects in the fetus.

The period from two years to puberty is known as _________________________.

The fetal blood that passes through the ductus venosus is relatively

During gastrulation,

The hollow cavity within the blastocyst is the _________________________.

_________________________ is a procedure in which cells collected from the villi are analyzed for genetic defects.

The process of growing old is called _________________________.

The mesoderm forms

_________________________ chromosomes are responsible for determining whether the individual will be male or female.

Joe and Jane desperately want to have children, and although they have tried for two years, they have not been successful. Finally, each of them consults a physician, and it turns out that Joe suffers from oligospermia (a low sperm count). He confides to you that he doesn't understand why this would interfere with his ability to have children since he remembers from biology class that it only takes one sperm to fertilize an egg. What would you tell him?

Using the figure above, identify the labeled part. -Label D: ________

A Barr body is a tiny cellular structure that represents

At puberty,