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- 1 in 1700 US Caucasian newborns has cystic fibrosis, which is only present in individuals with the homozygous recessive genotype. Assuming the population is in Hardy Weinberg equilibrium, what is the allele frequency of the dominant allele in the population.If a population of skunks includes some individuals with stripes and others with spots, would you describe the variation as quantitative or qualitative?What genotypes, and in what frequencies, will be present in the offspring from the following matings? a. AABBaaBB b. AaBbaabb c. AaBBAABb d. AaBbAaBb
- The phenomenon in which chance events cause unpredictable changes in allele frequencies is called: a. gene flow. b. genetic drift. c. inbreeding. d. balanced polymorphism. e. stabilizing selection.When male lions reach sexual maturity, they leave their group in search of a new pride. This can alter the allele frequencies of the population through which of the following mechanisms? natural selection genetic drift gene flow random matingWhich of the following represents an example of qualitative phenotypic variation? a. the lengths of peoples toes b. the body sizes of pigeons c. human ABO blood types d. the birth weights of humans e. the number of leaves on oak trees
- About 7% of men in a population are red-green colour blind due to a sex-linked recessive gene. Assuming random mating in the population with respect to colour blindness; c) What percentage of men would be colour blind in the next generation?1.) Which statement below is not consistent with a population in Hardy-Weinberg equilibrium? A.) Genetic drift is occuring. B.) Random mating is occuring. C.) Population size is large. D.) Migration is not occuring. 2.) Sickel cell anemia is an autosomal recessive genetic disorder. Because individuals affected by sickle cell anemia have defective hemoglobin proteins, their blood cannot transport oxygen properly. There appears to be a relationship between the incidence of malaria and sickle cell anemia. Individuals with sickle cell anemia are carriers of the sickle cell allele have some resistance to malaria. Malaria is caused by the parasite Plasmodium and is transmitted between humans by mosquitoes.” If scientists are successful in significantly reducing or eliminating malaria, the best prediction for what will happen to the allele for sickel cell anemia in the population is that it will: A.)not be affected by the elimination by malaria. B.) increase as its selective advantage…(1 point) Humans with the genotypes DD and Dd show the Rh+ blood phenotype, whereas those with the genotype dd show the Rh- blood phenotype. In a sample of 400 Basques from Spain, 230 people were Rh+ and 170 people were Rh-. Assuming that this population is in Hardy-Weinberg proportions, what is the allele frequency of the allele D? (a) (a) 0.348 (answer) (b) (b) 0.652 (c) (c) 0.425 (d) (d) 0.575 (e) (e) 0.288 2. (2 points) In the Basque population mentioned above, what proportion of the Rh+ individuals would be expected to be heterozygote? (a) (a) 0.454 (b) (b) 0.789 (answer) (c) (c) 0.516 (d) (d) 0.250 (e) (e) 0.500 How is the answer for #2, b? please explain
- 1. A sample of 600 individuals from a population is examined for the presence of the HindIII polymorphism in an autsomal Sca gene. There are two alleles of Sca gene, A and a. The results are 14 individuals are AA, 212 are Aa, 374 are aa. Please answer the following questions accordingly? How many alleles are present in the gene pool in the sample population fort he Sca gene? What are the genotype frequencies? What are the frequencies of A and a alleles? What are the expected numbers of the three genotypes, assuming random1.)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?6. Which of the following ratios from a cross between heterozygotes demonstrates gene interaction? 1:2:1 3:1 12:3:1 2:1
