Domanda del libro di testo
In Island Melanesia and Polynesia, most mtDNA haplotypes are of Asian ancestry, whereas Y chromosome haplotypes are predominantly New Guinean. Provide a hypothesis for this sex-biased distribution.
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Ch. 20 - Population Genetics and Evolution at the Population, Species, and Molecular Levels
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172
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TOC.tableOfContents
- Ch. 1 - The Molecular Basis of Heredity, Variation, and Evolution64
- Ch. 2 - Transmission Genetics144
- Ch. 3 - Cell Division and Chromosome Heredity81
- Ch. 4 - Gene Interaction87
- Ch. 5 - Genetic Linkage and Mapping in Eukaryotes103
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages73
- Ch. 7 - DNA Structure and Replication71
- Ch. 8 - Molecular Biology of Transcription and RNA Processing79
- Ch. 9 - The Molecular Biology of Translation110
- Ch. 10 - Eukaryotic Chromosome Abnormalities and Molecular Organization100
- Ch. 11 - Gene Mutation, DNA Repair, and Homologous Recombination86
- Ch. 12 - Regulation of Gene Expression in Bacteria and Bacteriophage90
- Ch. 13 - Regulation of Gene Expression in Eukaryotes38
- Ch. 14 - Analysis of Gene Function via Forward Genetics and Reverse Genetics72
- Ch. 15 - Recombinant DNA Technology and Its Applications69
- Ch. 16 - Genomics: Genetics from a Whole-Genome Perspective49
- Ch. 17 - Organelle Inheritance and the Evolution of Organelle Genomes27
- Ch. 18 - Developmental Genetics43
- Ch. 19 - Genetic Analysis of Quantitative Traits66
- Ch. 20 - Population Genetics and Evolution at the Population, Species, and Molecular Levels105
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Non è quello che usi tu?Cambia libro di testo
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Sanders 3rd EditionCh. 20 - Population Genetics and Evolution at the Population, Species, and Molecular LevelsProblema 10b
Sanders 3rd EditionCh. 20 - Population Genetics and Evolution at the Population, Species, and Molecular LevelsProblema 10bCapitolo 20, Problema 10b
The ability to taste the bitter compound phenylthiocarbamide (PTC) is an autosomal dominant trait. The inability to taste PTC is a recessive condition. In a sample of 500 people, 360 have the ability to taste PTC and 140 do not. Calculate the frequency of the dominant allele.
Guida verificata passo dopo passo1
Determine the total population size (N) from the problem statement. Here, N = 500.
Identify the number of individuals who cannot taste PTC (recessive phenotype). This is given as 140. These individuals are homozygous recessive (genotype q²).
Calculate the frequency of the recessive genotype (q²) by dividing the number of recessive individuals by the total population: q² = 140 / 500.
Find the frequency of the recessive allele (q) by taking the square root of q²: q = √(q²).
Use the Hardy-Weinberg equation (p + q = 1) to calculate the frequency of the dominant allele (p): p = 1 - q.
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Autosomal Dominance and Recessiveness
Autosomal dominance refers to a pattern of inheritance where only one copy of a dominant allele is needed for the trait to be expressed. In contrast, recessive traits require two copies of the recessive allele for expression. In the context of PTC tasting, the ability to taste is dominant, while the inability to taste is recessive.
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04:37
Variations on Dominance
Hardy-Weinberg Principle
The Hardy-Weinberg principle provides a mathematical framework for understanding allele frequencies in a population under ideal conditions. It states that allele and genotype frequencies will remain constant from generation to generation in the absence of evolutionary influences. This principle is essential for calculating allele frequencies, such as the frequency of the dominant allele in the given population.
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13:04Hardy Weinberg
Allele Frequency Calculation
Allele frequency is the proportion of a specific allele among all allele copies in a population. To calculate the frequency of the dominant allele (T) in the PTC tasting scenario, we can use the observed phenotypic ratios and apply the Hardy-Weinberg equations. This involves determining the number of homozygous dominant and heterozygous individuals based on the total population and the number of individuals expressing the dominant trait.
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03:03New Alleles and Migration
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Domanda del libro di testo
The ability to taste the bitter compound phenylthiocarbamide (PTC) is an autosomal dominant trait. The inability to taste PTC is a recessive condition. In a sample of 500 people, 360 have the ability to taste PTC and 140 do not. Calculate the frequency of each genotype.
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Domanda del libro di testo
The ability to taste the bitter compound phenylthiocarbamide (PTC) is an autosomal dominant trait. The inability to taste PTC is a recessive condition. In a sample of 500 people, 360 have the ability to taste PTC and 140 do not. Calculate the frequency of the recessive allele.
563
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Denisovans are known from bones found in Denisova Cave in the Altai Mountains in Siberia, but traces of their DNA are found in Australians and Melanesians, whose ancestors likely migrated across Asia much farther to the south. How can these geographic differences be reconciled?
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How can ancient DNA provide insight into past migrations that analyses of extant human genomes fail to uncover?
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