ickle cell anemia is maintained in human populations because individuals with a single copy of the sickle cell allele have resistance to malaria but lack the health problems of individuals with two copies of the allele. Variation at the sickle cell locus is maintained by which of the following? Group of answer choices A. heterozygote advantage B. random change in allele frequency C. mutation selection balance D. frequency dependent selection

ickle cell anemia is maintained in human populations because individuals with a single copy of the sickle cell allele have resistance to malaria but lack the health problems of individuals with two copies of the allele. Variation at the sickle cell locus is maintained by which of the following? Group of answer choices A. heterozygote advantage B. random change in allele frequency C. mutation selection balance D. frequency dependent selection

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter21: Microevolution: Genetic Changes Within Populations

Section: Chapter Questions

Problem 1TYK: The reason spontaneous mutations do not have an immediate effect on allele frequencies in a large...

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The reason spontaneous mutations do not have an immediate effect on allele frequencies in a large population is that: a. mutations are random events, and mutations may be eitherbeneficial or harmful. b. mutations usually occur in males and have little effect oneggs. c. many mutations exert their effects after an organism hasstopped reproducing. d. mutations are so rare that mutated alleles are greatlyoutnumbered by nonmutated alleles. e. most mutations do not change the amino acid sequence of aprotein.
Which of these statements would be consistent with the changes we see in the frequency of the recessive allele? Natural selection has been favoring those individuals who are heterozygous alleles. Natural selection has been favoring those individuals who are homozygous for the hemoglobin S allele.
population is black in colour but about 1/4 of them are white. gene (B) that produces an enzyme that converts a pigment molecule to produce the Black colour. There are 2 alleles of this gene - the dominant B and the recessive b. DNA analysis shows that black individuals have either a BB or Bb genotype and that white individuals have a bb phenotype. However, you have discovered that a small percentage of White individuals have either a BB or Bb genotype. Explain two reasons that could explain this apparent anomaly. They have a BB or Bb genotype but a white phenotype.
Valyrians have alleles for gene A, controlling hair color. The dominant A (silver hair) and the recessive a (brown hair). In a population of 3600 individuals, 2000 have genotype AA, 1000 have genotype Aa, and 600 have genotype aa. a-What is the frequency of allele a?
A particular allele is mice is lethal with homozygous genotype, however heterozygous mice develop normally. Why does this the lethal allele remain the population? Homozygous mice reproduce more than heterozygous mice. lo is masked in heterozygous mice.
Which of the following statements accurately describes some of the allele and chromosome (haplotype) frequencies? B O a. fA: 0.4, fAB: 0.32 O b.fg: 0.2, fAb: 0.12 O c. fA: 0.6, faB: 0.48 O d. fB: 0.8, fab: 0.8 AB
Valyrians have alleles for gene A, controlling hair color. The dominant A (silver hair) and the recessive a (brown hair). In a population of 3600 individuals, 2000 have genotype AA, 1000 have genotype Aa, and 600 have genotype aa. 1-What is the frequency of allele A? (Express the answer as a decimal with 3 places, ie .123
of 1 20 Which of the following rows identifies the frequency of the recessive allele for CF in the Amish population of Ohio and the American population as a whole Frequency of CF allele in Amish of Ohio population Frequency of CF Allele in Amish of American population Row D A. B. C The Amish are a group of people who rarely marry outside of their community. In one group of Amish in Ohio, the incidence of cystic fibrosis (CF), a genetic condition that is inherited in an autosomal recessive pattern, was 19 in 10816 live births. The incidence of cystic fibrosis in the American population as a whole is 1 in 3700 live births. 0.04 0.02 0.0003 0.0016 0.02 0.04 -based on Klinger 1983 0.0016 0.0003
Huntington’s Disease A population of people has a gene that determines whether they will developHuntington’s disease. The gene has two alleles, ”N” for normal allele and ”h” for the Huntington’s allele.According to the Hardy-Weinberg equilibrium, the frequency of the ”h” allele in the population is 0.005. Part AWhat is the frequency of the ”N” allele in the population?Part BWhat is the expected proportion of people in the population who are carriers of the Huntington’s disease?Part CWhat is the expected proportion of people in the population who are non-carriers of the Huntington’s disease?Part DWhat is the expected proportion of people in the population who will develop Huntington’s disease?
p + q = 1 p2 + 2pq + q2 = 1 p is the frequency of the dominant allele q is the frequency of the recessive allele p2 is the frequency of homozygous dominant genotype q2 is the frequency of homozygous recessive genotype 2pq is the frequency of heterozygous genotype Within a population of roses, the color red (R) is dominant over the color white (r). 40% of all the roses are white.a)The percentage of roses in the population that are heterozygous b) The frequency of homozygous dominant individuals =
A genotype is denoted by the alleles R and r. Will selection against the rr genotype ever lead to complete removal of the r allele from the population? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b с d It could if only Rr genotypes reproduce. It could if only rr genotypes reproduce. It could if only RR genotypes reproduce. This is impossible.
Scientists have found through the study of population genetics that human populations are different from one other and very small ways determined by the amounts of properties of alleles or genetic components and their DNA not the overall kinds this means that we are really only slightly different from one another but in what ways? Why do we think these differences are so important?