Mitochondria are thought to be the descendants of certain alpha -proteobacteria. They are, however, no longer able to lead independent lives because most

genes originally present on their chromosome have moved to the nuclear genome. Which phenomenon accounts for the movement of these genes?

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#Question id: 5091

#XL - T Zoology

In all vertebrate animals, development requires ________.

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#Question id: 5092

#XL - T Zoology

The least amount of yolk would be found in the egg of a ________.

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#Question id: 5093

#XL - T Zoology

Which of the following is a result of gastrulation in animals?

I) The archenteron is formed.

II) The body axes are established.

III) The germ layers are formed.

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#Question id: 5094

#XL - T Zoology

Cell migration occurs extensively during ________.

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#Question id: 5095

#XL - T Zoology

Changes in the shape of a cell usually involve a reorganization of the ________.

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#Question id: 5096

#XL - T Zoology

Select the choice that correctly matches the organ with its embryonic sources.