You have found fossils of a new species of ape that walks upright. After 11 additional years in the field, you discover a fossil of what you think is the common ancestor of the new species of ape and all other gorillas. What types of data would give you the best information on the environment of this ancestral organism? anatomical features of the new species of ape fossils of plants and animals found with the fossilized common ancestor gene sequencing of the new species of ape anatomical features of the fossilized common ancestor behavior of the new species of ape
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- What makes Archeopteryx an important fossil evolutionarily? This species has a mix of characters that suggest it was a "transitional" species between two large groups, dinosaurs and birds. This species is the oldest known, universally agreed upon, fossil of life, and therefore tells up what the common ancestor to all living things might have been like. This species is thought to be the last common ancestor between chimps and humans, and therefore is the root of our own specific group (homonins). This species has a mix of characters that suggests is was a "transitional" species between two large groups, fish and amphibians.Imagine that you have the DNA sequences fromthe intron of a gene in three species called A, B,and C. Species A and B are most closely related,while C is more distantly related. The sequencesof A and B differ by 18 base pairs, A and C differby 26 base pairs, and B and C differ by 28 basepairs. Fossils show that species A and B divergedabout 1.2 Mya, but there is no fossil evidence asto when the most recent common ancestor ofall three species lived. Use the genetic data toestimate that date. What assumptions are youmaking to get this estimate?These (1) are remnants of what was once useful to the ancestors of the species. Furthermore, we can infer from the distribution of related species across the Earth the connections between ancient landmasses. Finally, through (2) evidence found in the DNA, we have observed conserved genes and traceable mutations that tell us the phylogenetic relationships of life on earth.
- a. Phylogenetic relationships based on chloroplast genes Brown algae Diatoms Most photosynthetic dinoflagellates Cryptophyte algae Red algae Red algae Green algae Euglenids Green algae Chlorarachniophyte algae Green algae Green algae Green algae Green algae Land plants Glaucocystophytes Cyanobacteria b. Phylogenetic relationships based on nuclear genes Opisthokonts Amoebozoans Glaucocystophytes Red algae Green algae (including land plants) Cryptophyte algae 140000 Diatoms Brown algae Dinoflagellates Chlorarachniophyte algae Chloroplast genes relate brown algae, diatoms, most dinoflagellates, and cryptophyte algae to red algae, which is different from the relationships based on nuclear genes shown in part b. -Excavates Chloroplast genes relate euglenids and chlorarachniophyte algae to green algae, which is different from the relationships based on nuclear genes shown in part b. Chloroplasts form a monophyletic group nested within cyanobacteria, providing strong evidence for the…In the late 1800s, a biologist studying animal embryos coined the phrase “ontogeny recapitulates phylogeny,” meaning that the physical development of an animal embryo (ontogeny) seemed to retrace the changing form of the species during its evolutionary history (phylogeny). Why would embryonic development retrace evolutionary steps?A fossil believed to be the most recent common ancestor between housecats and lions is radio-dated to about 11 million years ago (mya). An analysis of a neutral section of mitochondrial DNA in both species finds 15 DNA base pair differences between the two cats today. Meanwhile, an analysis of housecats and pumas shows 4 DNA base pair differences between them, which are believed to have diverged around 3 mya. Using this data, what is the best estimate of the time since divergence of housecats and lynx, which have 11 DNA base pair differences in this mitochondrial DNA region? 5 mya O6 mya O 7 mya O8 mya 9 mya
- How, specifically, is the concept of ALLOMETRY relevant to the phylogenetic position of Homo floresiensis? Because if allometry explains the anatomy of Homo floresiensis then we can conclude that it is not separate species but instead a member of our species. Although most mammals on islands go through a process of getting smaller, Homo floresiensis evolved from a smaller ancestor to be bigger, meaning that allometry is an important factor. Mutations in the allometry allele are associated with many of the characteristics of Homo floresiensis. Because Homo floresiensis is so much smaller than other members of the genus Homo, it is important to determine how shape changes associated with smaller size impacted the species. Because Homo floresiensis had both small- and large-bodied forms, variation within the species is in large part dictated by allometry.The phylogenetic tree for vertebrates depicted below was constructed from sequence data for two rRNA mitochondrial genes (12S and 16S). How do the results of this analysis compare with the phylogenetic trees in Figures 32.10 and 32.24? Identify the major clades of vertebrates on the tree depicted below. Source: R. Zardoya and A. Meyer. 1998. Complete mitochondrial genome suggests diapsid affinities of turtles. Proceedings of the National Academy of Sciences, USA 95:1422614231. Copyright 1998 National Academy of Sciences, U.S.A.Shows how modern organisms descended from common ancestors Structures that do not serve a function and are similar to those found in earlier organisms 1. Transitional Species Compares the age of fossils to each other based on the layers of rock they are found in 2. Vestigial structure 3. Fossil Record 4. Relative Dating Evidence of gradual change between a new species and its ancestor 5. Radiometric Dating Structures that related species have inherited from a common ancestor 6. Homologous Structures uses radioactive elements to narrow down the age of a fossil to a specific period
- Imagine that you have the DNA sequences from the intron of a gene in three species called A, B, and C. Species A and B are most closely related, while C is more distantly related. The sequences of A and B differ by 18 base pairs, A and C differ by 26 base pairs, and B and C differ by 28 base pairs. Fossils show that species A and B diverged about 1.2 Mya, but there is no fossil evidence as to when the most recent common ancestor of all three species lived. (Draw a simple tree to help you think about the problem) Use the genetic data to estimate that date (most recent common ancestor). HINT = use Eqn 7.1, several times- first to estimate mutation rate. Then to estimate the unknown time since divergenceMichael Bunce and his colleagues in England, Canada, and theUnited States extracted and sequenced mitochondrial DNA from fossilsof Haast’s eagle, a gigantic eagle that was driven to extinction 700 yearsago when humans first arrived in New Zealand (M. Bunce et al. 2005.PLOS Biology 3:44–46). Using mitochondrial DNA sequences fromliving eagle species and those from Haast’s-eagle fossils, they createdthe accompanying phylogenetic tree. On this phylogenetic tree, identify(a) all nodes; (b) one example of a branch; and (c) the outgroup.Which of the following pieces of evidence would best support the argument that humans are more evolutionarily related to fish than they are to insects? All these organisms require oxygen to survive. The earliest fish fossils are found in the lowest strata of sedimentary rocks, followed by insects, and then humans. The early stages of embryo development in fish and humans look strikingly similar while insects develop very differently compared to both fish and humans. Fossils of ancient fish and human ancestors have been discovered in the same sedimentary rock layers.