Evolution
4th Edition
ISBN: 9781605356051
Author: Douglas Futuyma, Mark Kirkpatrick
Publisher: SINAUER
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Chapter 15, Problem 4PDT
Summary Introduction
To explain: The reason the evolutionary biologists maintain that modification of existing traits and the evolution of novel characters have proceeded by successive small steps.
Introduction: Evolution can be defined as the change in hereditary characteristics of biological populations over generations. It involves the inculcation of novel characteristics or traits over time. Evolution is based on the idea that all species are related and gradually change over a period of time.
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If mutations such as those of the Ubx gene can drastically change morphology in a single step, why do most evolutionary biologists maintain that modification of existingtraits and the evolution of novel characters have generally proceeded by successive small steps?
If mutations such as those of the Ubx gene candrastically change morphology in a single step,why do most evolutionary biologists maintainthat modification of existing traits and the evolution of novel characters have generally proceeded by successive small steps?
Which of the following examples from class show that a mutation can have evolutionary benefits?
Group of answer choices
C) Hox mutations that lead to legs developing on fruit flies where antennae should be
A and B
A, B, and C
B) Hox mutations leading to limbs with digits forming from lobe fins
A) Stickleback fish mutation
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- What is the difference between a neutral and an adaptive evolutionary process? Describe two or more examples of each. At the molecular level, explain how mutations can be neutral or adaptive.arrow_forwardWhat is a gene? Why are regulatory genes important to the evolutionary process? What is a mutation as defined in this course and readings. Are the end results of a mutation always "good" or always "bad"? Or is a mutation perhaps neither always good or always bad and could be "neutral or no effect" or "adaptive" in some situations? Does it depend on the gene, amino acid, protein, and case-by-case scenario? What genetic evidence suggests that humans are a part of a biological continuum with all life forms. Does the number of genes in a biological organism correlate, predict, or denote the complexity of the organism? Does the number of chromosomes in a biological organism correlate, predict, or denote the complexity of the organism?arrow_forwardHumans and chimpanzees share about 98% of their DNA. What is DNA? What might be the role of regulatory genes in producing the anatomical differences between these two lineages? Give two examples of how the field of genetics has revolutionized biological science. What is polymerase chain reaction (PCR) and why is it important in genetics?arrow_forward
- in 2000, the human genome was triumphantly released as a reference genome with approximately 8% missing information (gaps). In 2022- exactly 22 years later, technological advances enabled the gaps to be filled. This is a notable scientific milestone, leading to the resolution of critical aspects of human genetic diversity, including evolutionary comparisons to our ancestors. What was the technology used in 2022, and how significant are the gaps that have been resolved? What new insight will be gained from this new information- especially pertaining to understanding epigenetics?arrow_forwardWhy is molecular data for phylogenetic inference best analyzed with use of an explicit model of molecular evolution? A) This is true of morphological data, not molecular data, it is impossible to model changes in molecular sequence data because it is constantly evolving. B) Because molecular data is known to only experience random changes and is constantly evolving, a chaotic model of evolution can universally be applied to molecular sequence data for phylogenetic analysis. C) Because molecular data is known to experience non-random changes in terms of the likelihood of different types of mutations -- transitions vs. transversions, at different codon positions, which can be used to infer sequence evolution and relationship. D) None of the above.arrow_forwardThere are two hypotheses to explain the pattern of Human Evolution: 1) Progressive Evolution of a Single Lineage ; 2) Evolutionary Radiation Which of these hypotheses are supported by evidence, and briefly explain why? Please explain in detailsarrow_forward
- 10) Two processes that take place within a cell are shown here. Which of these statements correctly identify the processes and their outcomes? Select ALL that apply. A) Both processes increase genetic variation. B) Both processes can produce new phenotypes in an organism. C) Process II occurs randomly while process I is predictable. D) Process I is beneficial to the organism while process II is detrimental. E) Only process I can provide the basis for natural selection acting on phenotypes. Not Gradedarrow_forwardWhich of the following statements best explains the importance of sister taxa for understanding the evolution of ingroup taxa? A) The sister group informs of the likely state of the common ancestor of the ingroup. B) The sister group is composed only of ancestral characters representing a primitive taxon having ancestral states for all characters able to be studied. C) The sister group allows us to infer character state polarity in order to understand how character states have changed during evolution of the ingroup. D) A & B E) A& C F) All of the above.arrow_forwardFor each of the following examples, discuss whether the observed result is due to neutral mutations or mutations that have been acted on by natural selection, or both: A. When comparing sequences of homologous genes, differences in the coding sequence are most common at the wobble base (i.e., the third base in each codon). B. For a protein-encoding gene, the regions that encode portions of the polypeptide that are vital for structure and function are less likely to display mutations than other regions of the gene. C. When comparing the sequences of homologous genes, introns usually have more sequence differences than exons.arrow_forward
- You are collaborating with a cool new local brewery on an experiment with one of their strains Saccharomyces cerevisiae, brewer’s yeast. You decide to apply what you learned in Evolution to create a mutation accumulation (MA) line to see if the patterns of mutation in their strain of S. cerevisiae follow patterns seen in other species. Which of the following best describes an actual result you observe form studying the mutation accumulation (MA) lines you created? a. Beneficial mutations occur far less frequently than deleterious mutations do. b. The neutral mutations had a greater effect on fitness compared to other mutation types. c. Most of the mutations that occur are the result of large chromosomal rearrangements. d. Of all possible mutation types, deleterious mutations are the most common mutation.arrow_forwardThe genome size of humans and chimpanzees are both approximately 3 billion base pairs, sharing about 96% identical sequences. The 4% difference in their genomes is most likely the result of natural selection selecting for different sequences for adapting to different habitats. a)True b)Falsearrow_forwardWhich of the following best explains why coalescent-based phylogenetic inference is important in the age of phylogenomics? A) Coalescent-based methods directly model gene tree histories independently to infer the species tree in a summary-based manner, which is important for phylogenomic analysis were hundreds to thousands of gene histories are analyzed. B) Coalescent-based methods have the most advanced evolutionary models of molecular evolution, which is important for phylogenomic analysis were hundreds to thousands of gene histories are analyzed. C) Coalescent-based methods are no more important than other types of phylogenetic inference, even for phylogenomic analyses. D) None of the above.arrow_forward
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