Modern dogs are direct descendants of the gray wolf. They first appeared about 130,000 years ago. Today, there are about 150 different breeds of domestic dog. a few of which are shown below. 1. Gray wolf All modern domestic dogs are descendants of the gray wolf. adapted from: www.pba.org The great variety of modern dogs can best be explained by A. selective breeding of dogs over many years B. the cloning of domestic dogs C. genetic alterations in gray wolves alive today D. natural selection favoring wolves over dogs

Modern dogs are direct descendants of the gray wolf. They first appeared about 130,000 years ago. Today, there are about 150 different breeds of domestic dog. a few of which are shown below. 1. Gray wolf All modern domestic dogs are descendants of the gray wolf. adapted from: www.pba.org The great variety of modern dogs can best be explained by A. selective breeding of dogs over many years B. the cloning of domestic dogs C. genetic alterations in gray wolves alive today D. natural selection favoring wolves over dogs

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

Chapter21: Microevolution: Genetic Changes Within Populations

Section: Chapter Questions

Problem 1TYK: The reason spontaneous mutations do not have an immediate effect on allele frequencies in a large...

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Many organisms are studied by geneticists. Do you think each ofthe following species would be more likely to be studied by atransmission geneticist, a molecular geneticist, or a populationgeneticist? Explain your answer. Note: More than one answer maybe possible for a given species.A. DogsB. E. coliC. Fruit fliesD. LeopardsE. Corn
Consider the following estimates:(a) There are 7 x 109 humans living on this planet.(b) Each individual has about 20,000 (0.2 * 105) genes.(c) The average mutation rate at each locus is 10-5.How many spontaneous mutations are currently present inthe human population? Assuming that these mutations areequally distributed among all genes, how many new mutationshave arisen in each gene in the human population?
Some populations change noticeably in form within a hundred years. If only one gene in every 200,000 mutates and if most mutations are harmful, how is such change possible?
Assuming that the mutation rate is µ/gamete/generation andthe population size is N diploid individuals, what is the numberof new mutations introduced into the population each generation?
Define gene mutation Group of answer choices A. the process whereby organisms better adapted to their environment tend to survive and produce more offspring. B. the introduction of genetic material (by interbreeding) from one population of a species to another, thereby changing the composition of the gene pool of the receiving population C. variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce. D. A rare and random change in a gene that can be bad or benef icial depending on the environment .
ANSWER THE FOLLOWING I. a. What is genetic engineering? b. Compare classical breeding with modern genetic engineering. c. Describe some methods to introduce DNA into cells II a. List down at least 2 different traits that can be introduced to organisms to change their properties and give examples of modified traits using cloned genes and their and their applications. III a. Summarized the sequence of the periods in the geologic time scale. Include the major events and the characteristics of the major groups of organisms present during a time period. b. Identify what are the type of fossils. c. What are the causes of mass extinctions?
Answer the table below (this is about Genetic Engineering). 1. How organisms may be modified? 2. Enumerate plants and animals that have desirable or enhanced traits and how each of the traits was introduced or developed. Modifying Technique ex. Classical Breeding, Recombinant DNA Technology. ENHANCED TRAIT MODIFYING TECHNIQUE Example: Flavr- Savr ( Delayed Ripening Tomatoes Recombinant DNA Technology 1. 1. 2. 2. 3. 3. 4. 4. 5. 5.
Gene families arise in the human genome are thought to have risen from A. duplication followed by natural selection B. transformation like process C. none of the above D. selection leading to duplication
Advances in biotechnology have revolutionized the study of ancient remains. In Ötzi's case, a genetic study showed that his DNA most closely matched up with people that currently live in Sardinia. One hypothesis for this is that at Ötzi's time, a group of people with similar DNA spread throughout Europe including Sardinia. Sardinia is somewhat isolated so the DNA of the population living there has changed very little since that time. On mainland Europe, where his remains were found, there was more mixing of populations so there have been changes to the DNA profiles of the people living in that region. Questions: 1.) Based on the genetic results, do you think Ötzi should be considered Sardinian even though he lived in the Alps? Why or why not?
Two species of palm trees differ by 50 bp in a 5000-bpstretch of DNA that is thought to be neutral. The mutation rate for these species is 2 × 10−8 substitutions persite per generation. The generation time for these species is five years. Estimate the time since these specieshad a common ancestor
D) Two dragonfly populations that have accumulated several differences in their DNA sequences How do you know that is the answer? I thought we were not allowed to use DNA sequences in the lineage species concept.
Most new mutations are detrimental, yet rare beneficial mutations canbe adaptive. With regard to the fate of new mutations, discuss whetheryou think it is more important for natural selection to select againstdetrimental alleles or to select in favor of beneficial ones. Which doyou think is more significant in human populations?