Domanda del libro di testo
True or false? Gene flow can either increase or decrease the average fitness of a population. Explain.
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Ch. 23 - Evolutionary Processes
Freeman8th EditionBiological ScienceISBN: 9780138276263
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TOC.tableOfContents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Capitolo 23, Problema 2
Why isn't inbreeding considered an evolutionary process?
a. It does not change genotype frequencies.
b. It does not change allele frequencies.
c. It does not occur often enough to be important in evolution.
d. It does not violate the assumptions of the Hardy–Weinberg principle.
Guida verificata passo dopo passo1
Understand the concept of inbreeding: Inbreeding refers to the mating of individuals who are closely related genetically. This can lead to an increase in homozygosity, where individuals have two identical alleles for a particular gene.
Consider the impact on allele frequencies: Inbreeding does not change allele frequencies in a population. Allele frequencies remain constant because inbreeding only affects how alleles are distributed among individuals, not the overall genetic makeup of the population.
Examine genotype frequencies: Inbreeding can change genotype frequencies by increasing the proportion of homozygous individuals. However, this change in genotype frequencies does not equate to an evolutionary process, as evolution involves changes in allele frequencies over time.
Review the Hardy-Weinberg principle: The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of evolutionary influences. Inbreeding does not violate this principle because it does not alter allele frequencies.
Evaluate the significance in evolution: While inbreeding can have significant effects on individual fitness and population health, it is not considered an evolutionary process because it does not lead to changes in allele frequencies, which are necessary for evolution to occur.
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Inbreeding
Inbreeding refers to the mating of closely related individuals, which increases the chance of offspring inheriting identical alleles from both parents. While it affects genotype frequencies by increasing homozygosity, it does not alter allele frequencies in a population, which is why it is not considered an evolutionary process.
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07:31
Inbreeding and Sexual Selection
Allele Frequencies
Allele frequencies represent the relative frequency of different alleles of a gene in a population. Evolutionary processes, such as natural selection, mutation, and genetic drift, change these frequencies over time. Inbreeding does not change allele frequencies, thus it does not contribute to evolution in the same way these processes do.
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Percorso guidato
06:36Allele Frequencies
Hardy–Weinberg Principle
The Hardy–Weinberg principle provides a model for genetic equilibrium in a population, assuming no evolutionary influences like mutation, selection, or migration. Inbreeding does not violate this principle because it does not change allele frequencies, although it does affect genotype frequencies by increasing homozygosity.
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Percorso guidato
07:10The Hardy-Weinberg Principle Example 1
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Domanda del libro di testo
In a population of 2500, how many babies would you expect to have cystic fibrosis, a homozygous recessive condition, if the frequency of the dominant allele is 0.9 and the population is at Hardy–Weinberg equilibrium?
a. 0.9 × 2500 = 2250
b. 2 × 0.9 × 0.1 × 2500 = 450
c. 0.9 × 0.1 × 2500 = 225
d. 0.1 x 0.1 x 2500 = 25
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Domanda del libro di testo
Why is genetic drift aptly named? Select True or False for each statement.
T/F It causes allele frequencies to drift up or down randomly.
T/F It occurs when alleles from one population drift into another.
T/F It occurs when mutations drift into a genome.
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Domanda del libro di testo
In what sense is the Hardy–Weinberg principle a null hypothesis?
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