Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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Textbook Question
Chapter 12, Problem 2CT
In your own words, describe how genetic diversity makes a population resilient to environmental change.
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What 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 individuals
One of the following is gene flow:
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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.
I’m not sure which answer is an example of natural selection can you please help?
Chapter 12 Solutions
Biology: The Unity and Diversity of Life
Ch. 12 - BPA and Abnormal Meiosis In 1998, researchers at...Ch. 12 - BPA and Abnormal Meiosis In 1998, researchers at...Ch. 12 - BPA and Abnormal Meiosis In 1998, researchers at...Ch. 12 - One evolutionary advantage of sexual over asexual...Ch. 12 - Prob. 2SQCh. 12 - Prob. 3SQCh. 12 - Prob. 4SQCh. 12 - Meiosis ______ the parental chromosome number. a....Ch. 12 - Dogs have a diploid chromosome number or 78. How...Ch. 12 - The cell in the diagram to the right is in...
Ch. 12 - Which of the following cells can undergo meiosis?...Ch. 12 - Prob. 9SQCh. 12 - Crossing over mixes up ______. a. chromosomes b....Ch. 12 - Crossing over happens during which phase of...Ch. 12 - Prob. 12SQCh. 12 - Which of the following is one of the very...Ch. 12 - Match each term with the best description. _______...Ch. 12 - Prob. 15SQCh. 12 - The diploid chromosome number for the body cells...Ch. 12 - In your own words, describe how genetic diversity...Ch. 12 - Make a simple sketch of meiosis in a cell with a...Ch. 12 - Asexually reproducing animal populations are rare,...Ch. 12 - Figure 12-7 shows how meiosis in a cell with three...
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- Select all of the processes that can cause changes in allele frequencies. gene flow large population size genetic drift natural selection mutationarrow_forwardExplain : Populations of organisms evolve over generations to have more individuals with favorable traits.arrow_forwardOne of the dangers faced by a bottlenecked population is: Loss of genetic diversity and increased inbreeding Random changes in allele frequencies Gene flow Too much genetic diversityarrow_forward
- Match each of the following scenarios to the term that best describes it. Having more offspring because you can catch more food Being a puppy that is preferred over its siblings by a dog breeder [Choose ] Being richer and hence having better genes [Choose ] Natural Selection Sexual Selection Having more offspring because of alluring Eugenics tail feathers Artificial Selection [Choose ]arrow_forwardAs we saw last week, population size is important. Ideally, this means you started with a lot of genetically diverse founders, but of course that isn’t always the case. In the case of the Española Galapagos tortoises it was 12 females and 2 males. So, often you have to grow your population to stabilize it and ensure there isn’t an unacceptable loss of genetic diversity over time, even if that genetic diversity is low. If you think back to the math from last week and do a little not so fancy algebra, you can see that genetic deterioration occurs at a rate that is the inverse of genetic retention, which you probably remember is 1- (1/2Ne) Assume that the Española Galapagos tortoise captive population started with an Ne/N ratio of 0.7. Calculate their rate of loss of genetic diversity given their original population size of 14 tortoises (N=14). You will first need to solve for Ne, then plug Ne into the rate of loss of genetic diversity formula. Now let’s work on growing the population.…arrow_forwardWhat must be present in a population for natural selection to act on? Abundant resources A large population size Genetic variationarrow_forward
- Why is genetic variation important? It creates new combinations of genetic material that did not exist before. It allows some members of the population to adapt to changes in the environment. It is a necessary step in passing on traits from one generation to the next. It increases an organism’s survival and ability to breed.arrow_forwardBASED ON THIS GRAPH: A small community that is heavily infested with mosquitoes was sprayed weekly with the insecticide DDT for several months. Daily counts providing information on mosquito population size are represented in the graph below. Provide a biological explanation for the changes in the mosquito population over time. Use the terms: insecticide resistance/resistant, natural selection, favorable trait, reproduce, mutation/sexual reproductionarrow_forwardHow is variation different from adaptation? * No answer Variation is always caused by mutation while adaptation is a heritable trait. Variation is a difference within an individual organism from the rest of the population. An adaptation is a feature that helps an organism survive in its environment. Adaptation is a difference within an individual organism from the rest of the population. A variation is a feature that helps an organism survive in its environment. Variations are physical or behavioral traits that make an organism better suited to its environment while adaptation comes from random mutations.arrow_forward
- Who first proposed that the size of populations was controlled by the availability of resources? Select one: Gregor Mendel Charles Darwin Thomas Malthus Rosalind Franklinarrow_forwardMutations are the ultimate source of genetic variation. Consider a population of 500 diploid individuals. If a mutation resulting in a single copy of a novel allele occurred in a gene in one individual, what is the frequency of the new allele in the population? 0.05 0.000001 0.001 0.005 0.002arrow_forwardPosted a picture of my questionarrow_forward
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