2. Inner Fish - Bio 1 PDF

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Your inner fish

Name__________________________

The host of this show, _________ ________, is a paleontologist, anatomist and developmental biologist. He hunts for ______________ in the Canadian arctic. When asked "what kind of Doctor are you, Neil Shubin replied_______ __________ . _________ are the first creatures with bony skeletons. The Tree of Life. Around ___________ million years ago you'll find fish swimming in oceans and streams. _______________ million years later the first Amphibians appear on land. Then you see reptiles followed by mammals around ___________ mya. Every reptile, bird and mammal alive today is descended from ________ ________. Basic Pattern of Limbs. Here's a dog. Dogs run and jump. What do you have? ________ bone, _________ bones, ____________ bones, and then the ___________ . Same pattern in birds! Charles Darwin: "The reason why animals have this common pattern is because that at some time in the distant past they all shared a __________ ___________ . To find fossils. There is a checklist we run through. We look for places in the world that have rocks that are the right ____________.........Then you look for places in the world that have rocks that are the right __________ . The kinds of rocks that are likely to hold fossils. Ventastega, Acanthostega, Ichthyostega, Hynerpeton (found in Devonian rocks) (circle the three species referred to as "The 'Stegas'") Some of the best specimens have been found in ______________ ... We had a narrow window in the month of ___________when the snow melts just enough to let you in. The approximate age of the Devonian rocks in Shubin's search are is:_______ million years. In both fish and people what you find are a series of swellings called _________ __________ . In fish those swellings become components of the ______ ________( gill apparatus).

In humans they become portions of our ____________ ___________ , portions of our _____________ _____________ and portions of our voice box. An advantage of descended testicles is: ___________________________________. A disadvantage is: _____________________________________________________. We are, every one of us, just a jury rigged ___________ . Embryological interlude. Chick embryos. Fruit flies. Might a single molecule, that comes from a single gene, signal the development of limbs? ___________ _____________ a single gene (name), was the source of the signal responsible for generating the pattern of the digits. If we turn down sonic hedgehog _____________fingers are made but if we were to increase the effect of sonic hedgehog we would get ____________ fingers. These very basic patterning mechanisms are performing the exact same functions in the skate, the shark, in the chicken, in the mouse all the way up to _______________. Back to Greenland, July 2004. The local Inuit people named our fossil _____________ which means Large Freshwater Fish. Here was an animal Darwin predicted! Skeletal Features we have in common with Tiktaalik are: __________________________________________________________________ And what information-containing molecule links us back to Tiktaalik? _________ Class Discussion Why is it important (or interesting) to find transitional fossils?

What are the different lines of evidence that point to a shared ancestry among ourselves and other vertebrates? Invertebrates?

What processes (evolutionary, developmental, other) result in the changes in animal form over evolutionary time?...