Domanda del libro di testo
Determine what is incorrect in the following statement: Deer mice living on beaches mutated their genes so that they could have white fur color, providing better camouflage to survive on beaches.
391
views
Ch. 23 - Evolutionary Processes
Freeman8th EditionBiological ScienceISBN: 9780138276263
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
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 6
In the 1700s and 1800s, royalty in Europe often married their close relatives; furthermore, recessive genetic diseases such as hemophilia showed up much more often among royals than in the general population. Explain the likely connection.
Guida verificata passo dopo passo1
Identify the key concept: The problem mentions that royalty often married their close relatives and that recessive genetic diseases like hemophilia were more common among royals. This suggests a connection to the principles of genetics, specifically the inheritance of recessive traits.
Understand recessive traits: Recessive genetic diseases, such as hemophilia, are expressed phenotypically only when an individual has two copies of the recessive allele (homozygous recessive).
Explain the impact of inbreeding: When close relatives reproduce, there is a higher chance that both parents carry the same recessive alleles, as they share a significant amount of their genetic material. This increases the probability of their offspring inheriting two copies of the recessive allele, thus expressing the recessive trait.
Connect to royal families: In the context of European royalty, the practice of marrying within the family (inbreeding) would increase the likelihood of recessive genetic disorders manifesting in their children, as seen with diseases like hemophilia.
Conclude with the genetic principle: The increased occurrence of diseases like hemophilia among royal families can be attributed to the higher probability of inheriting recessive alleles due to inbreeding, demonstrating a direct application of Mendelian genetics.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
1mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Inbreeding
Inbreeding refers to the mating of individuals who are closely related genetically. This practice increases the likelihood of offspring inheriting identical alleles from both parents, which can lead to a higher incidence of recessive genetic disorders. In the context of European royalty, frequent intermarriage among relatives resulted in a greater expression of genetic diseases like hemophilia.
Video consigliato:
07:31
Inbreeding and Sexual Selection
Recessive Genetic Disorders
Recessive genetic disorders occur when an individual inherits two copies of a mutated gene, one from each parent. For a recessive trait to manifest, both alleles must be defective. In populations where inbreeding is common, the probability of two carriers mating increases, leading to a higher prevalence of these disorders, as seen with hemophilia among royals.
Video consigliato:
04:37X-Linked Recessive Disorder: Hemophilia Inheritance
Genetic Drift
Genetic drift is a mechanism of evolution that refers to random changes in allele frequencies within a population, particularly in small populations. In royal families, where the gene pool is limited due to inbreeding, genetic drift can exacerbate the effects of recessive disorders, making certain genetic traits, including diseases, more common over generations.
Video consigliato:
Percorso guidato
05:06Genetic Drift
Pratica correlata
Domanda del libro di testo
True or false? Gene flow can either increase or decrease the average fitness of a population. Explain.
1380
views
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
1197
views
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.
942
views
Domanda del libro di testo
Draw a small concept map showing how selection, genetic drift, gene flow, and mutation relate to genetic variation.
1060
views