Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 19, Problem 6TY
Summary Introduction
Introduction:
The presence of two or more variants in the given population for the same character is termed as the polymorphism. The cause of the polymorphism is the presence of two or more alleles for a single trait and influence of these alleles on the characters. Polymorphism is also used to describe the variation in DNA strands of species of the same population.
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Over the last several decades, the scientific community has gathered a large amount of information regarding genetics and genetic variation. What is a main source that leads to increased genetic variation?
Top of Form
Selective breeding
Chromosomal mutations
Recombination
Genetic drift
Mutations are the raw material for evolutionary change, without mutations there could be no new variations among members of a population.
Group of answer choices
True or false
Which of the following is the definition of a gene pool?
The combination of alleles that an individual organism possesses.
All the alleles in an ecosystem.
The total number of individuals in a population.
All the alleles in a population of a particular species.
Chapter 19 Solutions
Principles of Biology
Ch. 19.1 - Prob. 1TYKCh. 19.1 - Prob. 2TYKCh. 19.1 - The phrase an organism evolves is incorrect....Ch. 19.1 - Prob. 1BCCh. 19.2 - Explain how geography played a key role in the...Ch. 19.2 - Prob. 2CCCh. 19.2 - Prob. 3CCCh. 19.2 - Prob. 1TYKCh. 19.2 - Homologous traits show similarities because the...Ch. 19.3 - What is the frequency of pink flowers in a...
Ch. 19.3 - Prob. 1TYKCh. 19.3 - Prob. 2TYKCh. 19.4 - Lets suppose the climate on an island abruptly...Ch. 19.4 - Prob. 2CCCh. 19.4 - Prob. 3CCCh. 19.4 - Prob. 4CCCh. 19.4 - Prob. 1TYKCh. 19.4 - Prob. 2TYKCh. 19.4 - Prob. 3TYKCh. 19.5 - How does the bottleneck effect undermine the...Ch. 19.5 - Prob. 1TYKCh. 19.5 - Prob. 2TYKCh. 19.5 - Prob. 1BCCh. 19.6 - How does migration affect the genetic compositions...Ch. 19.6 - Prob. 1BCCh. 19.6 - Prob. 1TYKCh. 19.6 - Populations that experience inbreeding may also...Ch. 19 - Prob. 1TYCh. 19 - An evolutionary change in which a population of...Ch. 19 - Homology occurs because different species occupy...Ch. 19 - Prob. 4TYCh. 19 - Prob. 5TYCh. 19 - Prob. 6TYCh. 19 - Prob. 7TYCh. 19 - Prob. 8TYCh. 19 - Prob. 9TYCh. 19 - The micro-evolutionary factor most sensitive to...Ch. 19 - Prob. 1CCQCh. 19 - Prob. 2CCQCh. 19 - A principle of biology is that populations of...Ch. 19 - Prob. 1CBQCh. 19 - Prob. 2CBQ
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- You have already learned that mutation is one source of variation in a population. Based on what you have just seen, what is a second source of variation?arrow_forwardWhat is the probability of fixation of a gene in a population of 30 individuals (assume no selection for or against a mutation)? Multiple Choice 3.3% 3% 1.6% 0.16%arrow_forwardWhat is genetic flow? A) Genes changing due to mutation B) Random loss of genes in a small population C) Movement of genes between different populationsarrow_forward
- Imagine two populations of fish who are part of the same species. Though they are the same species, the two populations live in slightly different habitats and have some differences in their genetic code because of this. Imagine that several fish from population A migrate to the population B and reproduce. This introduced additional genetic variation to population. This is an example of: Group of answer choices Mutation Gene flow Genetic drift Natural selectionarrow_forwardThe equilibrium frequency of a deleterious allele under mutation-selection balance increases as: mutation rate increases strength of selection increases dominance increases none of the abovearrow_forwardWhat must be present in a population for natural selection to act on? Abundant resources A large population size Genetic variationarrow_forward
- One of the following is gene flow: Group of answer choices Because you were born more fat cells, you survive a long ocean voyage, and almost no one else does - just the fatter people, all of whom were born with the ability to make more fat cells. You and the others found a new population. You are good at music so you mate with someone who likes music. You are struck by an asteroid that no one predicted was coming to Earth. You are tall and you marry a short person from your neighborhood.arrow_forwardWhat is gene flow defined as? Group of answer choices A-production of new alleles B-chance loss of alleles in a population C-exchange of genes between populations D-production of new genetic material E-differential reproductive success of individualsarrow_forwardDescribe how population genetics is used to study the evolution of populationsarrow_forward
- According to the Hardy-Weinberg Equilibrium Equation, all of the following slow down or stop evolution EXCEPT (choose as many as apply): Group of answer choices very small population very large population no one leaves or comes into the population everyone has equal numbers of offspring there are no mutations there are lots of mutations there is non- random matingarrow_forwardWhich of the following are NOT processes that can change allelic frequencies? Group of answer choices Mutation Migration Natural selection Random matingarrow_forwardWhat is the source of genetic variation in a population? Natural selection Mutation and sexual reproduction Adaptationarrow_forward
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