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What is the EVIDENCE that all life evolved from a common ancestor?
Part 2
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Evidence that life EVOLVES from an earlier species (common ancestor):
TRANSITIONAL FOSSILS—shows slow gradual change of a species over a LONG time! CELL STRUCTURES—are similar among ALL living things DNA—the more DNA we share with another species, the closer we are related. EMBRYOS—
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On the back of your warm-up make the following list:
HUMAN DOLPHIN OWL HORSE PIG CAT ELEPHANT MINK BAT TURTLE
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Try to match the following embryos to the right creatures below…
HUMAN DOLPHIN OWL HORSE PIG CAT ELEPHANT MINK BAT TURTLE
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A. pig
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B. turtle
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C. bat
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D. cat
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E. elephant
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F. owl
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G. mink
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H. dolphin
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I. human
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J. horse
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A. pig
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B. turtle
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C. bat
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D. cat
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E. elephant
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F. owl
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G. mink
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H. human
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I. dolphin
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J. horse
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Why is This is hard to get right?
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Evidence that life EVOLVES from an earlier species (common ancestor):
TRANSITIONAL FOSSILS—shows slow gradual change of a species over a LONG time! CELL STRUCTURES—are similar among ALL living things DNA—the more DNA we share with another species, the closer we are related. EMBRYOS—So much life start out looking the same way!
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Evidence that life EVOLVES from an earlier species (common ancestor):
TRANSITIONAL FOSSILS—shows slow gradual change of a species over a LONG time! CELL STRUCTURES—are similar among ALL living things DNA—the more DNA we share with another species, the closer we are related. EMBRYOS—So much life start out looking the same way! HOMOLOGOUS STRUCTURES--
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“HOMO” means what? HOMOgenous mixtures are like pudding and kool aid!
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“HOMO” means “SAME” HOMOgenous mixtures are like pudding and kool aid!
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show the fish from 8/2011
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Evidence that life EVOLVES from an earlier species (common ancestor):
TRANSITIONAL FOSSILS—shows slow gradual change of a species over a LONG time! CELL STRUCTURES—are similar among ALL living things DNA—the more DNA we share with another species, the closer we are related. EMBRYOS—we all start out life looking the same way! HOMOLOGOUS STRUCTURES--physical structures SO SIMILAR that they strongly indicate a common ancestor
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HOMOlogous FINGER structures…
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HOMOlogous ARM BONE structures….
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Evidence that life EVOLVES from an earlier species (common ancestor):
TRANSITIONAL FOSSILS—shows slow gradual change of a species over a LONG time! CELL STRUCTURES—are similar among ALL living things DNA—the more DNA we share with another species, the closer we are related. EMBRYOS—we all start out life looking the same way! HOMOLOGOUS STRUCTURES--physical structures SO SIMILAR that they strongly indicate a common ancestor
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HOMOLOGOUS IS NOT ANALOGOUS!
What are analogies?
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ANALOGOUS things share a SIMILAR PURPOSE, but DIFFERENT STRUCTURE!
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ANALOGOUS things share a SIMILAR PURPOSE, but DIFFERENT STRUCTURE!
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ANALOGOUS things share a SIMILAR PURPOSE, but DIFFERENT STRUCTURE!
Both cat whiskers and bug antennae are helpful for these living things to sense their environment, but are structured differently.
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ANALOGOUS things share a SIMILAR PURPOSE, but DIFFERENT STRUCTURE!
Both cat whiskers and bug antennae are helpful for these living things to sense their environment, but are structured differently.
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ANALOGOUS STRUCTURES DO THE SAME THING BUT ARE STRUCTURALLY DIFFERENT!
Compare bird wings to insect wings. Would you say they are homologous or analogous structures? ANALOGOUS STRUCTURES DO THE SAME THING BUT ARE STRUCTURALLY DIFFERENT!
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ANALOGOUS STRUCTURES DO THE SAME THING BUT ARE STRUCTURALLY DIFFERENT!
Compare bird wings to insect wings. Would you say they are homologous or analogous structures? ANALOGOUS STRUCTURES DO THE SAME THING BUT ARE STRUCTURALLY DIFFERENT!
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homologous or analogous structure???
INSECT EYES MAMMAL EYES
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homologous or analogous structure???
INSECT EYES MAMMAL EYES
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homologous or analogous structure???
PENGUIN FINS FISH FINS
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homologous or analogous structure???
PENGUIN FINS FISH FINS
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homologous or analogous structure???
HUMAN KIDNEYS DOLPHIN KIDNEYS
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homologous or analogous structure???
HUMAN KIDNEYS DOLPHIN KIDNEYS
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homologous or analogous structure???
JELLYFISH TENDRILS OCTOPUS TENTACLES
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homologous or analogous structure???
JELLYFISH TENDRILS OCTOPUS TENTACLES
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Homologous or analogous? Chicken feet vs. T-rex feet
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Homologous or analogous? Chicken feet vs. T-rex feet
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Evidence that life EVOLVES from an earlier species (common ancestor):
TRANSITIONAL FOSSILS—shows slow gradual change of a species over a LONG time! CELL STRUCTURES—are similar among ALL living things DNA—the more DNA we share with another species, the closer we are related. EMBRYOS—All life start out looking the same way! HOMOLOGOUS STRUCTURES--physical structures SO SIMILAR that they strongly indicate a common ancestor NOT ANALOGOUS!
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Evidence that life EVOLVES from an earlier species (common ancestor):
TRANSITIONAL FOSSILS—shows slow gradual change of a species over a LONG time! CELL STRUCTURES—are similar among ALL living things DNA—the more DNA we share with another species, the closer we are related. EMBRYOS—All life start out looking the same way! HOMOLOGOUS STRUCTURES--physical structures SO SIMILAR that they strongly indicate a common ancestor NOT ANALOGOUS! VESTIGIAL ORGANS—
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vestigial organs… the human appendix
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vestigial organs… hind leg bones on a snake
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vestigial organs… the tail bone of a human
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vestigial organs… our wisdom teeth
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vestigial organs… our wisdom teeth
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vestigial organs… NICTITATING MEMBRANE!
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VESTIGIAL ORGANS…REMNANTS of ORGANS THAT SHOW US WHAT WE USED TO NEED in our earliest ancestors!
NICTITATING MEMBRANE!
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Evidence that life EVOLVES from an earlier species (common ancestor):
TRANSITIONAL FOSSILS—shows slow gradual change of a species over a LONG time! CELL STRUCTURES—are similar among ALL living things DNA—the more DNA we share with another species, the closer we are related. EMBRYOS—All life start out looking the same way! HOMOLOGOUS STRUCTURES--physical structures SO SIMILAR that they strongly indicate a common ancestor NOT ANALOGOUS! VESTIGIAL ORGANS—an organ that served a purpose in the distant earlier ancestor of an organism, but isn’t needed anymore.
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Would the nictitating membrane of the frog & cat be homologous or analogous?
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Would the nictitating membrane of the frog & cat be homologous or analogous?
they are both physically structured the same way.
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end! post assess…
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