WHAT IS LIFE W/ACHIEVE ACCESS >B<
5th Edition
ISBN: 9781319488086
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 10, Problem 6SA
Summary Introduction
To analyze:
Whether recessive alleles tend to decrease in a population.
Introduction:
An allele that gives the organism a disadvantage at reproducing, will not be passed on to the future generations.
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The frequency of a recessive allele in a population is 50%. What is the frequency of the dominant allele?
In a population the homozygous dominant individuals (AA) made up 49% of the population, while heterozygous ones (Aa) made up 42%, and recessive (aa) made up 9%. What are the frequencies of the A and a alleles?
Does inbreeding affect allele frequencies? Why or why not? How does it affect genotype frequencies? With regard to rare recessive diseases, what are the consequences of inbreeding in human populations?
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WHAT IS LIFE W/ACHIEVE ACCESS >B<
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- In a population the homozygous dominant individuals made up 70% of the population, while heterozygous ones made up 21%, and recessive made up 9%. What are the frequencies of the A and a alleles?arrow_forwardThere are 350 dominant homozygotes, 75 heterozygotes, and 40 recessive homozygotes in a population. How many dominant and how many recessive alleles are in this population? What would be their respective allele frequencies?arrow_forwardIf 90 out of 200 individuals in a population express the recessive phenotype, what is the frequency of the recessive allele?If 90 out of 200 individuals in a population express the recessive phenotype, what proportion of the population are expected to be heterozygotes?arrow_forward
- There are 100 dominant homozygotes, 100 heterozygotes, and 100 recessive homozygotes in a population. How many dominant alleles and how many recessive alleles are in this population? What would be their respective allele frequencies?arrow_forwardWhat is the ultimate cause of variation in populations?arrow_forwardWhat Causes Allele Frequencies to Change in Real Populations?arrow_forward
- Is it easier for selection to remove a deleterious recessive allele from a randomly mating population or from a highly inbred population? Why?arrow_forwardFor EACH of the observed traits, which is most frequent in our class population, the dominant phenotype or the recessive phenotype? Why?arrow_forwardThere are 60 dominant homozygotes, 100 heterozygotes, and 25 recessive homozygotes in a population. How many dominant alleles are in the population? How many recessive alleles are in the population? For these alleles, what would be the allele frequencies of both?arrow_forward
- How can natural selection maintain harmful alleles in a population?arrow_forwardWhy do recessive lethals persist in a population? Provide an example of a recessive lethal allele.arrow_forwardWhy is genetic variability necessary in a population? What can happen if genetic variability is reduced?arrow_forward
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