Concept explainers
Natural selection changes allele frequencies because some ______ survive and reproduce better than others.
- A. alleles
- B. loci
- C. species
- D. individuals
Introduction:
The term “natural selection” was given and popularized by Charles Darwin. Simply, it is defined as “survival of the fittest”. It is the differential survival of organisms on the basis of their phenotype and genotype. Natural selection is the key to evolution.
Answer to Problem 1TYU
Correct answer:
Some individuals survive and reproduce better than others. Therefore, option (D) is correct.
Explanation of Solution
Reasons for the correct statement:
Some individuals survive and reproduce better than the others. This is due to the difference in genotype or different individuals. Individuals acquire traits, which may be better than the others. This is responsible for natural selection.
Option (D) is given as “individuals”.
“Natural selection changes allele frequencies because some individuals survive and reproduce better than others”, it is the right answer.
Hence, the option (D) is correct.
Reasons for the incorrect statement:
Option (A) is given as “alleles”.
Alleles are defined as alternate form of the same gene. These are found in same loci on the same chromosome. Alleles are a result of mutation. Allele frequency increases as cross-reproduction increases. Same alleles cannot be found in each generation. So, it is a wrong answer.
Option (B) is given as “loci”.
Loci are the fixed location on a chromosome. These define the position of a genetic marker or a gene. These are not responsible for natural selection. So, it is a wrong answer.
Option (C) is given as “species”.
Species is a group of morphologically similar individuals, which are capable of interbreeding. Species evolve due to natural selection, but no two individuals in a species can have the same genotype. Some individuals in a species have better chances of survival than others. So, it is a wrong answer.
Hence, options (A), (B), and (C) are incorrect.
Natural selection is a process of differential selection of individuals. It is the basic reason of evolution. Some individuals in a species have better chances of survival than others and species keep on acquiring new and better traits than previous ones due to this reason.
Want to see more full solutions like this?
Chapter 21 Solutions
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
Additional Science Textbook Solutions
Campbell Essential Biology (7th Edition)
Laboratory Manual For Human Anatomy & Physiology
The Cosmic Perspective (8th Edition)
Chemistry & Chemical Reactivity
Physical Science
Genetics: From Genes to Genomes
- magine that you are conducting research on fruit type and seed dispersal. You submitted a paper to a peer-reviewed journal that addresses the factors that impact fruit type and seed dispersal mechanisms in plants of Central America. The editor of the journal communicates that your paper may be published if you make ‘minor revisions’ to the document. Describe two characteristics that you would expect in seeds that are dispersed by the wind. Contrast this with what you would expect for seeds that are gathered, buried or eaten by animals, and explain why they are different. (Editor’s note: Providing this information in your discussion will help readers to consider the significance of the research).arrow_forwardWhat is the difference between Uniporters, Symporters and Antiporters? Which of these are examples of active transport?arrow_forwardWhat are coupled transporters?arrow_forward
- How do histamine and prostaglandins help in the mobilization of leukocytes to an injury site? What are chemotactic factors? How do they affect inflammation process?arrow_forwardCompare and contrast neutrophils and macrophages. Describe two ways they are different and two ways they are similar.arrow_forwardDescribe the effects of three cytokines (not involved in the initial inflammation response). What cells release them?arrow_forward
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education