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
ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
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
- Not part of a graded assignment, from a past midtermarrow_forwardNoggin mutation: The mouse, one of the phenotypic consequences of Noggin mutationis mispatterning of the spinal cord, in the posterior region of the mouse embryo, suchthat in the hindlimb region the more ventral fates are lost, and the dorsal Pax3 domain isexpanded. (this experiment is not in the lectures).a. Hypothesis for why: What would be your hypothesis for why the ventral fatesare lost and dorsal fates expanded? Include in your answer the words notochord,BMP, SHH and either (or both of) surface ectoderm or lateral plate mesodermarrow_forwardNot part of a graded assignment, from a past midtermarrow_forward
- Explain in a flowcharts organazing the words down below: genetics Chromosomes Inheritance DNA & Genes Mutations Proteinsarrow_forwardplease helparrow_forwardWhat does the heavy dark line along collecting duct tell us about water reabsorption in this individual at this time? What does the heavy dark line along collecting duct tell us about ADH secretion in this individual at this time?arrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage LearningBiology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage LearningBiology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning





