When scientists use molecular clocks to estimate the timing of evolutionary change, the assumption is that... Group of answer choices telomeres were not fixed the climate was constant throughout the lineage the organisms engaged in random sexual mixing genes in related species mutate at a fairly constant rate

When scientists use molecular clocks to estimate the timing of evolutionary change, the assumption is that... Group of answer choices telomeres were not fixed the climate was constant throughout the lineage the organisms engaged in random sexual mixing genes in related species mutate at a fairly constant rate

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter24: Systematics And Phylogenetics: Revealing The Tree Of Life

Section: Chapter Questions

Problem 1ITD: The phylogenetic tree for 12 cat species (Felidae) reproduced at right was assembled from molecular...

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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?
Punctuated Equilibrium is a hypothesis that ... suggests that evolution is not gradual but occurs in uneven pulses, where the evolution of new species can happen rapidly. O None of these answers are true suggests evolution happens when there is a disturbance in "the force." O envisions evolution occurring through sudden changes in a gene pool. envisions evolution as a slow/gradual process.
Vestigial structures are: structures that were helpful to our ancestors but do not serve any useful purpose under current conditions structures that are only helpful when there is competition for survival structures that are harmful relics of our evolution structures that appear to contradict our understanding of how evolution works O000
Recent reconstructions of evolutionary history are often dependenton assigning divergence in terms of changes in amino acid ornucleotide sequences. For example, a comparison of cytochromec shows 10 amino acid differences between humans and dogs,24 differences between humans and moths, and 38 differencesbetween humans and yeast. Such data provide no information asto the absolute times of divergence for humans, dogs, moths, andyeast. How might one calibrate the molecular clock to an absolutetime clock? What problems might one encounter in such acalibration?
Evolution in Humans: 1) describe several techniques that paleontologists today use to establish fossil age 2) describe how tracking changes in DNA sequence among related organisms can be used to create a migration map
Why do distantly related species (such as ostriches, emus, and rheas) in very different places sometimes share similar traits? * O They evolved from a recent common ancestor They can travel very long distances in a short period of time The environments they live in are similar, so similar traits are selected Humans have caused them to evolve through artificial selection Lenovo -> esc & @ %23 $4 4 6 7 1 e t y tab f g n m shift alt ctrl
Does the scenario describe evolution at the micro or macro level? Sexual selection leads to brighter male plumage in a species of duck. Choose. The evolution of the land plants as a major terrestrial group Choose. A branch of the Archaea gives rise to the domain Eukaryota Choose.. Speciation of new world monkeys in South America Choose.. Genetic drift results in a deleterious allele being fixed in a population of black-footed ferrets Choose...
Refer to figure 13.25 and the chapter content to answer the followingquestions.1. Review the Survey the Landscape figure in the chapter introduction.What diagrams do scientists use to visualize evolutionaryrelationships? Add this term to the concept map. 2. Write a phrase to connect fossils and biogeography and a separatephrase to connect development and DNA. 3. Add the following terms to this concept map: homologous structures,vestigial structures, homeotic genes, and molecular clock.
You are exploring the Amazon rainforests before it was completely destroyed. Particularly, you focus on a family of plants that are known to produce chemicals with great medicinal benefit. You sequenced the genomes of several related species and identified the gene, vge (à very good enzymea) responsible for the production of a potential anticancer drug. On the right is the schematic of the genomic region where the vge genes resides. You found that different species have different number of the vge genes. For example, the genome of spécies A (Sp. A) carries three copies of vge genes (vge-A, vge-B, and vge-C). Although they all encode the VGE enzyme and have the same function, their DNA sequences are not entirely identical to each other. Based on this observation, you can conclude that vge-A and vge-B are O orthologous to each other O paralogous to each other O analogous to each other O monophyletic to each other O None of the above Sp. A Sp. B Sp. C Sp. D vge-A vge-B vge-A vge-A vge-B…
n which situation would it make sense to use the phylogenetic species concept? When you are not able to collect data about how individuals in your study use their habitat, but you are able to collect reproductive data When you are able to collect data about how individuals in your study use their habitat, but you are unable to determine if they interbreed When you only have genetic data about each organism in your study When working with fossils from extinct organisms
You are studying two variations of banana slugs. They have similar coloration and live in the same habitat. Although they are physically able to mate, there are no offspring that survive embryologic development. What can you conclude about the banana slugs? * O Pre-zygotic barriers have forced them to be separate species. They are in Hardy-Weinberg equilibrium. O Microevolution is occurring in both variations. O They are two separate species.
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…