Q5.1. Which of the following is FALSE?If a genetic disease reduces fertility and the allele that causes the disease offers no otheradvantage, the allele will likely eventually disappear, due to natural selection.Natural selection does not favor individuals who are homozygous for the sickle-cell allele, becausethese individuals typically die before they are old enough to reproduce.Individuals who are heterozygous HbA/ HbS are protected from malaria, and this is why sickle-celldisease persists in wetter, mosquito-prone regions in Africa.OIn regions where malaria does not occur, individuals who are heterozygous HBAIHBS have a fitnessadvantage over those who are homozygous for the normal hemoglobin allele (HbA).SubmitQ5.2. AFTER malaria is cured, the frequency of the HbS allele should decrease in regions withlots of mosquitoes because:People will no longer die from sickle-cell disease in these regions.Having one copy of the HbS allele will no longer be advantageous in these regions.Registra...e 1020-2conjunct...or hiringAuthorization docFor

Sickle Cell anaemia is a fatal disease which occurs when both the alleles are expressed in…

If a genetic disease reduces fertility and the allele that causes the disease offers no other advantage, the allele will likely eventually disappear, due to natural selection. Natural selection does not favor individuals who are homozygous for the sickle-cell allele, becaus these individuals typically die before they are old enough to reproduce. Individuals who are heterozygous HbA/ HbS are protected from malaria, and this is why sickle-cell disease persists in wetter, mosquito-prone regions in Africa. In regions where malaria does not occur, individuals who are heterozygous HbAIHbS have a fitness

If a genetic disease reduces fertility and the allele that causes the disease offers no other advantage, the allele will likely eventually disappear, due to natural selection. Natural selection does not favor individuals who are homozygous for the sickle-cell allele, becaus these individuals typically die before they are old enough to reproduce. Individuals who are heterozygous HbA/ HbS are protected from malaria, and this is why sickle-cell disease persists in wetter, mosquito-prone regions in Africa. In regions where malaria does not occur, individuals who are heterozygous HbAIHbS have a fitness

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter19: The Evolution Of Populations

Section: Chapter Questions

Problem 15RQ: The good genes hypothesis is a theory that explains what? why more fit individuals are more likely...

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Describe a situation in which a population would undergo the bottleneck effect and explain what impact that would have on the population’s gene pool.
17. Which of the following statements best explains the Theory of Natural Selection? * a. Organs that are not used may disappear, while organs that are constantly used may develop b. In nature, the organism with desirable characteristics may survive, while those weaker traits may not c. Organisms develop desirable structures to survive in a given environment d. Acquired characteristics of parents can be passed on to offspring 18. Larry Daley is a paleontologist found out some Central American Acacia species that have hollow thorns and pores at the bases of their leaves that secrete nectar. He used the species to understand the history and origin of the place. From the given situation, the Central American Acacia species is an example of _____________. * a. evolution b. fossil c. mutation d. coevolution
27. Which of the following statements best explains the prevalence and geographic distribution of sickle cell anemia allele (HbS). The homozygotes for normal hemoglobin protein are always at an advantage in all environments. Homozygous recessive individuals are selected for in malarial environments. Heterozygous individuals are at a selective advantage in malarial environments. Sickle cell anemia is found in high frequencies only among West Africans and their descendants. none of the above.
5.) A man and a woman living in a tropical area where malaria is prevalent and health care is not accessible have seven children during their lifetime. The genotypes of their children are: ss, Ss, SS, ss, Ss, Ss, and SS. What must the genotypes of both parents be? Your answer should include a Punnett square to illustrate your work, and list all the genotypes and phenotypes.
1.)The frequency of the R allele for round seeds in a certain population of 500 peas wasfound to be 0.45. How many of them were wrinkled? How many of them had the rr genotype? How many of them were round? 2.)In humans, a dominant allele controls the formation of a cleft chin, a Y-shaped fissurein the chin caused by an atypical bone formation in the mandible (this phenotypeis also known as a chin dimple). A survey of 1200 college students found that108 of them did not have a cleft chin. What was the frequency of heterozygotes inthat student population?
Describe natural selection and give an example of natural selection at work in a population.
#27 a.) which of the following are both forces of evolution 1. Selection and Mutation 2. Selection and infinite populations 3. Gene Flow and Mendelian genetics 4. Migration and Random mating b.) In this part we want to know which of the following are assumptions of the Hardy Weinberg equilibrium model? Mark all the correct assumptions. 1. there is no mutation 2. all genotypes have different fitness 3. sexual selection 4. random mating
1. List three places outside of Africa where sickle-cell anemia is fairly common in the indigenous population: a. b. c. 2. Why hasn't the sickle-cell trait died out? 3. What is the ultimate source of biological variation? What is the difference between gene flow and genetic drift?
Q5.9. A person who is heterozygous for the cystic fibrosis allele moves to a small, isolated community where no one previously carried the allele. If the cystic fibrosis allele protects against tuberculosis the same way the sickle cell allele protects against malaria, what should happen to the frequency of the cystic fibrosis allele in the community over time, and why?
4.) A man and a woman have a child. The father is blood type A, and one of his parents was blood type A and the other was blood type O. The mother is blood type B, and one of her parents was blood type B, the other type O. Both the father and the mother are carriers of the Bombay allele. (Neither of the type-O grandparents were type O because of the Bombay allele – they had the regular type O genotype.) WhataretheoddsthattheirbabywillhavebloodtypeO? WhataretheoddsthattheirbabywillhavebloodtypeAB? (Hint – for this question, you should draw out a pedigree and fill in as much as you can for the genotypes of BOTH genes that are involved.)
1. The frequency of a recessive disease is 9%. What is the frequency of the allele that causes s the disease? a) What is the frequency of the dominant allele? b) What is the frequency of the carriers (heterozygotes) of the disease?
25. Answer the following questions based on the facts and inferences related to natural selection that we discussed in class, as well as the simulations you performed with the Evodots lab. If individuals vary, and variation affects survival and reproduction, and variation is heritable: there will be natural selection resulting in evolution. there will be no natural selection, but there will be evolution due to natural selection. there will be natural selection, but it will not result in evolution. there will be no natural selection, and there will be no evolution due to natural selection. 24. Answer the following questions based on the facts and inferences related to natural selection that we discussed in class, as well as the simulations you performed with the Evodots lab. If individuals vary, and variation affects survival and reproduction, but variation is not heritable: there will be natural selection resulting in evolution. there will be no natural selection, but…