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Name
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Slide Show
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Description
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Number of Stills
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 |
Stills from a time-lapse video sequence of mitosis in
an animal cell
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10
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|
 |
The transformation of a fertilized, single-celled egg into an embryo is a most remarkable and profoundly mysterious process. Differentiation starts with continuing rounds of cell divisions. Soon complex movements of large numbers of cells are followed by their differentiation into many types of cells, organized so as to create the different tissues needed by a higher organism. |
10
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|
 |
Biologist Lewis Wolpert says "It is not birth, marriage, or death, but gastrulation, which is truly the most important time of your life". Gastrulation initiates the differentiation of the important tissues (gut, heart, lungs, muscle...) inside the embryo. |
5
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|
 |
The Volvocales, a group of green algae, demonstrate how single cells can evolve into complicated organisms by sticking together after they have undergone cycles of cell division. |
7
|
|
 |
The Chlorococcales share a common type of Chlamymonad ancestor with the Volcocales, but show entirely different evolutionary tendencies. They produce a variety of simple unicellular and colonial forms of widely varying shapes; the constituent cells are non-flagellate for most or all their life cycles. |
10
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*These events are shown live in our video tape: "From Egg to Tadpole: Early Morphogenesis in Xenopus"
**These cells and their reproductive cycles are shown live in the video disc: "Cellular Evolution in the Green Algae".
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