Evolution Biologists define evolution as the change in the frequency of alleles (variations of a gene) in a population. Consider the following situation: Two colors of grasshoppers-brown and red-result from the two variations (alleles) of the color gene in this species. These grasshoppers live in two areas: an area with brown soil, and on an adjacent mountain with reddish soil. ►All the grasshoppers in both areas were accidentally killed by a fire. ► Ecologists re-introduced 1000 red and 1000 brown grasshoppers into each of the two soil areas. And, grasshoppers are a great food source for any bird that can catch them. 1. What do you think the ecologists discovered when they returned to the experimental sites five years later? Babies from the red and browns grasshoppers 2. What factor controls the actual color of a grasshopper? Depends if the color is a dominant allele 3. What determines the color frequency of grasshoppers in the two soil areas? 4. Is there only one direction of change during evolution? Explain yom answer. can evolve in No, because things different ways by different things.

Evolution Biologists define evolution as the change in the frequency of alleles (variations of a gene) in a population. Consider the following situation: Two colors of grasshoppers-brown and red-result from the two variations (alleles) of the color gene in this species. These grasshoppers live in two areas: an area with brown soil, and on an adjacent mountain with reddish soil. ►All the grasshoppers in both areas were accidentally killed by a fire. ► Ecologists re-introduced 1000 red and 1000 brown grasshoppers into each of the two soil areas. And, grasshoppers are a great food source for any bird that can catch them. 1. What do you think the ecologists discovered when they returned to the experimental sites five years later? Babies from the red and browns grasshoppers 2. What factor controls the actual color of a grasshopper? Depends if the color is a dominant allele 3. What determines the color frequency of grasshoppers in the two soil areas? 4. Is there only one direction of change during evolution? Explain yom answer. can evolve in No, because things different ways by different things.

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter10: Biotechnology

Section: Chapter Questions

Problem 14SQ

See similar textbooks

Similar questions

Please match: 12345 Allele 12345 Analogous 12345 Sympatric 12345 Homologous 12345 Allopatric 1. The wing of a bat and the leg of a horse are examples of ____ structures 2. The wing of a bat and the wing of a butterfly are examples of______ structures 3. A version of a gene is called a(n) 4. Speciation that occurs when two species are together is called 5. Speciation resulting from two populations being separated by a physical barrier is called
Part 3: Molecular Evolution Exercise Below are reported nucleotide species of animals. sequences for an intron in the same gene for 4 different A В D G T T A A G. A A A A T T G G CGTGG < ETCATOGAGGATO CCTTG < ATTCA CCTGG <
Activity 4. Evolutionary Though Timeline thought. Write only the concise key concepts involved in each box. Directions: Complete the table below to summarize the history of evolutionary What I Have Learned W Pre-1800s Evolutionary thought of: Carolus Linnaeus on nomenclature and classification 1800s-1900 Thomas Malthus on Human Population 1800s-1900 (continuation) Georges Cuvier on Extinction James Hutton and Charles Lyell on Uniformitarianism Jean-Baptiste Lamarck on evolution Charles Darwin on Natural Selection
Match the words. There are three phases of evolution expressed in the modern theory of evolution. First, genetic variation is produced at three levels. At the level of DNA,________ is a chemical change in the DNA molecule, which gives rise to variation. At the level of the individual organism, __________ gives rise to variation during the formation of gamete cells. At the level of the population, migration gives rise to variation. Second, there is a reduction of genetic variation by two processes. One process,_________ is the chance (or random) removal of genetic variants due to sampling error from generation to generation. It is especially effective in small populations. The other process, _________, eliminates the less fit variants (such as those less successful at avoiding predators or finding food). meiosis reproductive isolation genetic drift natural selection gene mutation
Revise the passage Darwin is best known for his Theory of Inheritance of Acquired Characteristics, first presented in 1801 (Darwin's first book dealing with natural selection was published in 1859):Based on these observations and inferences, Darwin concluded that these traits, called adaptations were the product of evolution by Acquired Traits, these traits made the members of the population who had them equally fit for survival. an organism could also change during their lifetime in order to adapt to its environment, those changes are passed on to its offspring. For example, darwin believed that if giraffes stretched their necks to reach food, Their offspring and later generations would inherit the resulting long necks.
I need help with a biology question, thanks The gene pool includes____________ Group of answer choices below: all of the fitness within a population. all of the individuals within a population. all of the mutations within a population. all of the alleles of genes within a population.
Ⓒ Macmillan Learning The figure shows a bar plot of moles from three parks in New York City. Each vertical bar represents genotypes from 18 genomic locations in one animal. The bars are color coded, with similar genotypes represented by the same color. Population A Population B Population C From the data in the figure, are these three populations genetically isolated from one another? Incorrect Population A is isolated from the other two populations. What environmental factors could explain this? One park may not be connected to any other park by a greenway. Only two parks may be connected by greenways. All the parks may be connected to each other by greenways. None of the parks may be connected to each other by greenways.
frequencies. Impacts of Natural Selection Read the following scenario. Use the Hardy-Weinberg principle and your knowledge of natural selection to explain the scientists' logic. Provide your answer in two standard paragraphs (four or five sentences each) using complete sentences. Refer to the given scenario in your answer. In an isolated population of 1,000 white-tailed deer, about 850 deer possess long legs. The dominant allele for leg length is long legs, and deer that are homozygous for this dominant allele or are heterozygous possess long legs. The population mates randomly and is stable. Living in a forest, they feed mostly on shrubs and the low-hanging leaves and branches of understory trees During the last 20 growing seasons, the shrub layer has slowly disappeared from the ecosystem. The population of deer adapted by foraging primarily on the leaves and branches of understory trees. Over browsing has occurred, and the understory trees have lost most of their leaves and tender…
SUO Part C - Natural selection in monkey flowers Some monkey flowers (Mimulus guttatus) living near the sites of copper mines can grow in soil containing high concentrations of copper, which is toxic to most plants. Copper tolerance is a heritable trait. The map below shows the area near an old copper mine, which contaminated the nearby soil with copper. A stream flows past the mine toward the lake at the bottom right of the map. A map of the area near an old copper mine. Omine shaft Key Copper-contaminated soil Uncontaminated sol Sites where nearly 100% of the monkey-flower plants are copper tolerant at 0.5 po/om lake O Sites where less than 20% of the monkey-flower plants are copper tolerant P Pearson S ASUS Break sysra pri se deleto home backspoce H. enter shiftO did
Question 14 Saving. Organismo may not be perfectly adapted to their environments for which of the following reasons: Physical constraints that cannot be overcome. Because natural selection cannot anticipate future conditions, adaptati on lags at least one generation behi nd any environmental changes that occur. The same trait may face contradictory selection pressures (e.g., large/sexy fins vs small/fast fins) There may not be any geneti c variation available for evolution of certain traits that woul d provide a fitness advantage if they were present. All of the above.
True or False? Mutations are a source of genetic variation (differences) in a species. O True False
NATURAL SELECTION A. 1 Q # 1. Describe what is happening in figures 1-3. Is the population of mice different in figure 3 than in figure 1? Explain why. 食 Adapted from the University of California, Los Angeles Life Sciences 1 Demonstration Manual Copyright 2008 by Jennifer Doherty and Dr. Ingrid Waldron, Department of Biology, University of Pennsylvania¹ CAS ced by by each complete de So sfir QUA 2 why this 49 M ness is que which Qu 3 yould biologists ha $02. cm/sec. and produce offspring who C Fo C Living things that are well adapted to their environment survive and reproduce. Those that are not well adapted don't survive and reproduce. An adaptation is any characteristic that increases fitness, which is defined as the ability to survive and reproduce. 2. What characteristic of the mice is an adaptation that increased their fitness? ¹ Teachers are encouraged to copy this student handout for classroom use. A Word file (which can be used to prepare a modified version if desired), Teacher…