A cell is exposed to EMS (a mutagen that causes guanine to mispair with thymine) and allowed to undergo a few rounds of DNA replication.  The mutational event caused by this mutagen will be

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#Question id: 5086

#5. Developmental Biology

Cells move to new positions as an embryo establishes its three germ tissue layers during ________.

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#Question id: 5087

#5. Developmental Biology

The outer-to-inner sequence of tissue layers in a post-gastrulation vertebrate embryo is ________.

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#Question id: 5088

#5. Developmental Biology

 If gastrulation was blocked by an environmental toxin, then ________.

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#Question id: 5089

#5. Developmental Biology

The archenteron of the developing sea urchin eventually develops into the ________.

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#Question id: 5090

#5. Developmental Biology

Which of the following is a correct description of the fate of the germ layers?

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#Question id: 5091

#5. Developmental Biology

In all vertebrate animals, development requires ________.