Carboniferous 2 - From Lobe-fin to amphibian.note origin of...

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Urbilateria is an example of an archetype, a hypothetical organism which possesses characteristics or traits which are present, but modified, in descendent lineages. Developmental and genetic studies support the hypothesis that Deuterostomes (which include us) kept the ancestral state of the dorso- ventral axis, but Protostomes (most of the other invertebrate taxa) reversed the polarity of their dorso-ventral axis. This split in development patterns occurred early in the evolutionary history of animals (e.g. Cambrian) During the Carboniferous Period there was a remarkable diversification of Protostomes associated with environmental heterogeneity and abundant resources on land and in freshwater
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1. A “molecular clock” implies: a) A fairly constant rate of mutation b) Mutations accumulate over time c) The number of mutations not shared between organisms is proportional to the time they last shared a common ancestor d) The fact most mutations are neutral e) New mutations are occurring now
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Buettnaria -early amphibian
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Unformatted text preview: From Lobe-fin to amphibian.note origin of radius & ulna Fish or Amphibians? Mudskippers are ? First reptiles appear late in Carboniferous, and will replace amphibians as the major land-dwelling vertebrate during the Permian Period. 2. This is Pikaia , a candidate for the first chordate. When did it appear in the fossil record? a. Carboniferous b. Devonian c. Silurian d. Cambrian e. Ordivician The coniferous trees first appear late in the Carboniferous Period 3. Cyanobacteria a) Poisoned most of the life present on Earth beginning roughly 3 billion years ago b) Produced the first oxygen-rich atmosphere c) Left the first fossils strongly evident of life on Earth d) Are prokaryotes e) All of the above describe cyanobacteria 4. Prokaryotic endosymbionts a) Are responsible for mitochondria in eukaryotic cells b) Are responsible for chloroplasts in eukaryotic cells c) Are responsible for endoparasitic diseases in eukaryotic cells d) A and B are correct e) A, B and C are correct...
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Carboniferous 2 - From Lobe-fin to amphibian.note origin of...

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