Human Biology Custom Edition
11th Edition
ISBN: 9781337631532
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 23, Problem 2SQ
The relative numbers of different genes (alleles) in a gene pool change as a result of four processes of microevolution: _________, _________, _________, and _________.
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Describe and sketch each of the traits from the list, listing genotypes and phenotypes for each.
Note: You can do a lot better than the example shown above. Please show the sketches properly.
Describe and sketch each of the traits from the list, listing genotypes and phenotypes for each.
Note: You can do a lot better than the example shown above.
Sixteen percent of a population is unable to taste the chemical PTC. These non-tasters are recessive for the tasting gene.
What percentage of individuals in the population are tasters? ______________
What is the frequency of the dominant and recessive allele? _____________________________
What percentage of the population are heterozygous for the trait? ___________________
Chapter 23 Solutions
Human Biology Custom Edition
Ch. 23 - Prob. 1RQCh. 23 - As shown in Figure 23.25, there is considerable...Ch. 23 - Prob. 3RQCh. 23 - Prob. 4RQCh. 23 - Prob. 5RQCh. 23 - Prob. 6RQCh. 23 - Prob. 1SQCh. 23 - The relative numbers of different genes (alleles)...Ch. 23 - A difference in survival and reproduction among...Ch. 23 - The fossil record of evolution correlates with...
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- A form of learning disabilities and speech impairment results from a recessive mutation in the HERC2 gene. The next 4 questions are about this mutation. In a small Amish village in Ohio, about 5 per 1000 births are affected with this disorder. Assume Hardy Weinberg equilibrium. What is the frequency of the dominant WT HERC2 allele in this small village? A form of learning disabilities and speech impairment results from a recessive mutation in the HERC2 gene. The next 4 questions are about this mutation. Part a: In a small Amish village in Ohio, about 5 per 1000 births are affected with this disorder. Assume Hardy Weinberg equilibrium. What is the frequency of the dominant WT HERC2 allele in this small village? a)0.005 b)0.995 c)0.07 d)0.93 Part b: What is the estimated total number of homozygous dominant individuals in this village of 1000 people? a) 70 b) 930 c) 860 d) 140arrow_forwardMany genetic disorders, such as cystic fibrosis and sickle-cell disease are due to mutations in a recessive allele. You have sampled an isolated population in which you know that the percentage of the homozygous recessive genotype (aa) is 36%. Using that 36%, calculate: 1g. the frequency of the recessive phenotype if "A" is completely dominant over "a” (round to the nearest hundredth)arrow_forwardTrue or False: Higher eukaryotic organisms inherit two alleles for each trait – one paternal and one maternal. Question options: False Truearrow_forward
- Albinism is a rare genetically inherited trait that is only expressed in the phenotype of homozygous recessive individuals (aa). The most characteristic symptom is a marked deficiency in the skin and hair pigment melanin. This condition can occur among humans as well as among other animal species. The average human frequency of albinism in North America is about 1 in 20,000. 1. Calculate the genotypic frequencies and place your answer below. Show your work. # 3 AA Aa aa 2. What is the percentage of carriers (heterozygotes) in the N.A. population? Edit View Insert Format Tools Table 12pt ✓ 80 F3 $ 4 Paragraph 000 000 F4 LLO % 5 BIUAVA F5 MacBook Air 6 ※ V F6 & 7 T²V : ◄◄ F7 8 DII F8 DD 9 F9arrow_forwardPlease read the scenario below, and then answer the question (in bold) that follows. Tay-Sachs disease is a fatal autosomal recessive disorder in children (usually by age 5) that causes a progressive degeneration of the central nervous system. This disease affects 1 in 3,500 newborns of European Ashkenazi Jewish ancestry in the U.S. population. What is the frequency of the recessive allele in the population? a. 0.0003 b. 0.0170 c. 0.0332 d. 0.9665 e. 0.9830arrow_forwardIn a population of 500 fruit flies, 250 are genotype RR, 100 are genotype Rr and 150 are genotype rr. Determine the allele frequencies for this gene in this population. Remember that the frequencies should add to 1. Please show your work.arrow_forward
- The magnification of genetic drift as a result of natural events or catastrophes is _____; _____ is the flow of alleles in and out of a population due to the migration of individuals or gametes.arrow_forwardConsider the case of a hypothetical genetic disease called WhySciEleven (WSE), an inherited disease that results to the inability to complete production of an amino acid “moduleactivity” that results in brain damage if untreated. WSE is due to a recessive allele. Given one WSE occurrence per 10,000 births. Which term in the Hardy-Weinberg equation corresponds to the frequency of individuals who have no alleles for the disease WSE? a. p b. 2pq c. p2 d. q2arrow_forwardPlease double check the information is done correctly. And, using the information and data, answer the question at the bottom of the second page which asks: “Did your results from the coin tosses support your prediction from the Punnett Square? Specify the data you used.” Write the answer in detailarrow_forward
- True or False: Microevolution is commonly observed in real-timearrow_forwardIn Labrador retrievers, coat color is controlled by gene interaction in which homozygosity for a recessive allele can mask the phenotypic expression of a second gene. This genetic interaction is known as ________ and has a characteristic ________ ratio.arrow_forwardMany genetic disorders, such as cystic fibrosis and sickle-cell disease are due to mutations in a recessive allele. You have sampled an isolated population in which you know that the percentage of the homozygous recessive genotype (aa) is 36%. Using that 36%, calculate: 1d. the frequency of the "AA" genotype (round to the nearest hundredth)arrow_forward
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