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Questions and Answers
The trophoblast contributes to the formation of the placenta and nourishes the embryo.
True
The inner cell mass is also called the embryonic blast.
False
Genetic engineering of human children to create 'designer babies' was once only found in science fiction.
True
Eugenics involves using information and technology to deteriorate the genetic makeup of the human race.
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Nazi Germany implemented an extensive eugenics program in the early 1900s that forcibly sterilized and killed many individuals.
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Robert Klark Graham's sperm bank exclusively collected samples from donors with low IQs.
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The blastula is a spherical layer of cells surrounding a fluid-filled cavity called the blastocoel.
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Cleavage involves an increase in the mass of the zygote as it divides into multiple cells.
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In mammals, the blastula forms the blastocyst at the next stage of development.
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The type of cleavage (holoblastic or meroblastic) depends on the amount of yolk present in the egg.
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In birds, the eggs undergo holoblastic cleavage due to the presence of a large amount of yolk.
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The blastocyst in mammals is characterized by the absence of an inner cell mass.
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