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Population geneticists are interested in the
- a. a deletion of a gene sequence.
- b. a duplication of a region of a gene.
- c. a rearrangement of a gene sequence.
- d. a single-
nucleotide substitution. - e. an inversion of a segment of a chromosome.
Introduction: Polymorphism can be defined as a process by which a particular trait displays several types of variations among a population. A polymorphic population shows more than one phenotype for that particular trait.
Answer to Problem 1TY
Correct answer: A single-nucleotide substitution is the most common type of genetic change that leads to polymorphism in a population. Hence, the correct answer is option d.
Explanation of Solution
Reason for correct answer:
Single-nucleotide substitution results in the change in genetic makeup due to a change in a single nucleotide. These changes are responsible for coding different types of amino acids, which in turn will code for different proteins. Different functional protein will lead to the generation of various types of phenotypes among the members of a population. So, they are the simplest and common type of genetic change that occur in a gene.
Option d. is given as “a single-nucleotide substitution”.
The most common type of genetic change that is responsible for causing polymorphism is single-nucleotide substitution. Hence, the correct answer is option d.
Reasons for incorrect answer:
Option a. is given as, “a deletion of a gene sequence”.
A deletion in gene sequence can cause variations in the genome. However, it is not the most common type of genetic change that results in polymorphism. Hence, option a. is incorrect.
Option b. is given as, “a duplication of a region of a gene”.
Duplication of a region of gene occurs in extreme cases of genome repairing process. It also occurs due to the various types of mutation at the time of replication of genetic material. So, it is not the most common type of genetic change. Hence, option b. is incorrect.
Option c. is given as, “a rearrangement of a gene sequence”.
A rearrangement of a sequence of gene can cause polymorphism to some extent but it occurs majorly in case of genome repair. So, it is not the most common type of genetic change. Hence, option c. is incorrect.
Option e. is given as, “an inversion of a segment of a chromosome”.
Process of inversion of a segment of gene sequence is not at all related with the process of polymorphism. Hence, option e. is incorrect.
Hence, the options a., b., c., and e. are incorrect.
Single-nucleotide substitution is responsible for polymorphism. It is the most common process which results in genetic changes among the gene sequences and leads to the process of polymorphism very frequently.
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Chapter 23 Solutions
Biology
- Which of the following is the definition of the term named Genes? a.Refers to genes that have identical alleles b.Genetic constitution of an organism c.Alternative form of a gene d.Trait expressed in the F1 generation e.Fundamental physical and functional unit of heredity f.Physical expression of traits of an organismarrow_forwardSelect the TRUE statement about genetic engineering?" A. The process of direct manipulating of an organism's genes using biotechnology. B. The manipulation of organisms or their components to make useful products. C. Utilizing the natural biological processes of the existing living systems. D. The process of transferring genetic traits through cross-breeding.arrow_forwardThe basic units of information that encode the proteins needed to grow and function as a living organism are called: Select one: a. Chromosomes O b. Genes c. Mutations O d. Cells O e. Mendel's postulatesarrow_forward
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- Which of the following is false? a. The color of a fruit fly's eyes is a trait. b. The instructions for producing a trait are found in a gene that controls the physical expression of that trait. c. A gene can have different alleles that can specify different traits, such as red or brown eye color. d. The trait is influenced by the gene, independent of the environment. e. By studying the patterns of traits over generations of an organism, the genetic composition of an organism can be deduced.arrow_forwardWhich of the following is not a commonly used method of modifying the DNA of an organism?a. crossbreeding two plants of the same speciesb. crossbreeding two plants of different speciesc. the polymerase chain reactiond. genetic engineeringarrow_forwardWhat happens to an organism (plant, animal, or microorganism) during genetic modification? A. Fewer desirable genes are transferred to a new species. B. Genes are removed from one organism and transferred to another. C. Plants or animals are given traits that they typically have. D. All of the abovearrow_forward
- Imagine you've been offered a deal from a genomics company. You can get a free genome sequence – an analysis of all your DNA that includes a report of your ancestry, traits and a medical profile. The medical profile tells you about diseases for which you have a low risk of getting, and also those you have a high risk of getting. Are you interested? Why or why not?arrow_forwardWhich of the following is true about DNA manipulation? Select the best answer. A. all of these B. DNA has never been transferred between different organisms. C. Transferring DNA from one organism into another always kills the host organism. D. Whole genomes have been manipulated by humans for centuries; now individual genes ca be inserted into different organisms using a variety of techniques. E. DNA can't be manipulated.arrow_forwardMany organisms are studied by geneticists. Of the following species, do you think it would be more likely for them to be studied by a transmission geneticist, a molecular geneticist, or a population geneticist? Explain your answer. Note: More than one answer may be possible. A. Dogs B E. coli C. Fruit flies D. Leopards E. Corn Lab 1arrow_forward
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