The National Geographic Magazine, Volume 210, Issues 4-6National Geographic Society., 2006 - Geography |
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Page 120
will become . Across the larva , different combi- nations of genes are active , marking it off into invisible compartments . These genes turn on other genes that give each compartment its shape and function : Some sprout legs , others ...
will become . Across the larva , different combi- nations of genes are active , marking it off into invisible compartments . These genes turn on other genes that give each compartment its shape and function : Some sprout legs , others ...
Page 134
... genes caused these append- ages to change shape into legs , arms , wings . Each transformation was profound . But ... genes being borrowed each time for new uses . In reptile embryos specific genes mark off the front and back of each ...
... genes caused these append- ages to change shape into legs , arms , wings . Each transformation was profound . But ... genes being borrowed each time for new uses . In reptile embryos specific genes mark off the front and back of each ...
Page 135
... genes that build flowers are older than the flowers themselves . Gymnosperms turn out to carry flower - building genes even though they don't make flowers . Scientists have yet to deter- mine what those genes do in gymnosperms , but ...
... genes that build flowers are older than the flowers themselves . Gymnosperms turn out to carry flower - building genes even though they don't make flowers . Scientists have yet to deter- mine what those genes do in gymnosperms , but ...
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