course hero what can we learn about vertebrates evolution from tiktaalik that we did not know

by Rebecca Mertz 6 min read

What type of vertebrate is Tiktaalik?

A) Fossils can be dated using a method called radiometric dating. B) Fossils can be dated relative to other fossils found in layers of rock. C) Fossils can be dated using a microscope to examine tissue. D) Fossils can be dated by dating the rock in which they are discovered.

What did the Tiktaalik dinosaur evolve from?

Oct 12, 2018 · Chimpanzees exhibit 99% genetic similarity to humans. Cows share approximately 80% of their DNA sequence with humans. Scientists can predict the relative age of a common ancestor using DNA sequences.

What does Tiktaalik's internal anatomy say about evolution?

Tiktaalik (/ t ɪ k ˈ t ɑː l ɪ k /; Inuktitut ᑎᒃᑖᓕᒃ) is a monospecific genus of extinct sarcopterygian (lobe-finned fish) from the Late Devonian Period, about 375 Mya (million years ago), having many features akin to those of tetrapods (four-legged animals).. Unearthed in Arctic Canada, Tiktaalik is technically a fish, complete with scales and gills – but it has a triangular ...

What does Tiktaalik tell us about tetrapods?

What are the features of a Tiktaalik?

Tiktaalik generally had the characteristics of a lobe-finned fish, but with front fins featuring arm-like skeletal structures more akin to those of a crocodile, including a shoulder, elbow, and wrist. The fossil discovered in 2004 did not include the rear fins and tail.

How old is Tiktaalik roseae?

Tiktaalik roseae is the only species classified under the genus. Tiktaalik lived approximately 375 million years ago. It is representative of the transition between non-tetrapod vertebrates (fish) such as Panderichthys, known from fossils 380 million years old, and early tetrapods such as Acanthostega and Ichthyostega, ...

What is an alligator gar?

The alligator gar is an extant fish that bears some resemblance to Tiktaalik. Also notable are the spiracles on the top of the head, which suggest the creature had primitive lungs as well as gills. This attribute would have been useful in shallow water, where higher water temperature would lower oxygen content.

Is Tiktaalik a sister taxon?

The phylogenetic analysis by Daeschler et al. placed Tiktaalik as a sister taxon to Elpistostege and directly above Panderichthys preceded by Eusthenopteron. Tiktaalik was thus inserted below Acanthostega and Ichthyostega as a transitional form and a true "missing link".