Domanda del libro di testo
Given the inheritance pattern of coat color in rats described in Problem 17, predict the genotype and phenotype of the parents who produced the following offspring:
9/16 gray: 3/16 yellow: 4/16 albino
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Ch. 4 - Extensions of Mendelian Genetics
Klug12th EditionConcepts of GeneticsISBN: 9780135564776
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics17
- Ch. 2 - Mitosis and Meiosis36
- Ch. 3 - Mendelian Genetics51
- Ch. 4 - Extensions of Mendelian Genetics74
- Ch. 5 - Chromosome Mapping in Eukaryotes51
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages46
- Ch. 7 - Sex Determination and Sex Chromosomes33
- Ch. 8 - Chromosome Mutations: Variation in Number and Arrangement40
- Ch. 9 - Extranuclear Inheritance31
- Ch. 10 - DNA Structure and Analysis43
- Ch. 11 - DNA Replication and Recombination44
- Ch. 12 - DNA Organization in Chromosomes30
- Ch. 13 - The Genetic Code and Transcription54
- Ch. 14 - Translation and Proteins47
- Ch. 15 - Gene Mutation, DNA Repair, and Transposition41
- Ch. 16 - Regulation of Gene Expression in Bacteria29
- Ch. 17 - Transcriptional Regulation in Eukaryotes41
- Ch. 18 - Post-transcriptional Regulation in Eukaryotes33
- Ch. 19 - Epigenetics33
- Ch. 20 - Recombinant DNA Technology44
- Ch. 21 - Genomic Analysis36
- Ch. 22 - Applications of Genetic Engineering and Biotechnology36
- Ch. 23 - Developmental Genetics37
- Ch. 24 - Cancer Genetics34
- Ch. 25 - Quantitative Genetics and Multifactorial Traits54
- Ch. 26 - Population and Evolutionary Genetics45
Klug12th EditionConcepts of GeneticsISBN: 9780135564776Non è quello che usi tu?Cambia libro di testo
Capitolo 4, Problema 18c
Given the inheritance pattern of coat color in rats described in Problem 17, predict the genotype and phenotype of the parents who produced the following offspring: 27/64 gray:
16/64 albino: 9/64 yellow: 9/64 black: 3/64 cream
Guida verificata passo dopo passo1
Step 1: Identify the inheritance pattern described in Problem 17. Since the offspring phenotypic ratios are given as fractions out of 64, this suggests a dihybrid cross involving two genes with multiple alleles affecting coat color in rats. Typically, such ratios come from a cross involving two genes with epistatic interactions or multiple alleles.
Step 2: Assign symbols to the genes involved. For example, let’s say gene A controls pigment production (A = pigment, a = albino) and gene B controls pigment color (B = black, b = yellow). The presence of albino (16/64) suggests recessive homozygosity at the A locus (aa) results in albino phenotype regardless of B locus genotype.
Step 3: Analyze the phenotypic ratios to deduce genotypes. The ratio 27/64 gray, 16/64 albino, 9/64 yellow, 9/64 black, and 3/64 cream suggests a combination of genotypes at both loci. Use the expected Mendelian ratios for dihybrid crosses and epistasis to match these numbers to genotypes.
Step 4: Use Punnett squares to model the cross between two heterozygous parents at both loci (e.g., AaBb x AaBb) and calculate the expected phenotypic ratios. Compare these expected ratios to the observed ratios to confirm the parental genotypes.
Step 5: Conclude the most likely genotypes of the parents based on the matching phenotypic ratios and explain the phenotypes of the offspring based on the genotypes at each locus, considering dominance, recessiveness, and epistatic interactions.
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Mendelian Inheritance and Dihybrid Crosses
Mendelian inheritance explains how traits are passed from parents to offspring through dominant and recessive alleles. A dihybrid cross involves two genes, each with two alleles, producing a characteristic phenotypic ratio in offspring. Understanding these ratios helps predict parental genotypes based on observed offspring phenotypes.
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Percorso guidato
15:24
Punnet Square
Epistasis and Coat Color Genetics
Epistasis occurs when one gene masks or modifies the expression of another gene, affecting phenotypic ratios. In coat color genetics, interactions between multiple loci (e.g., pigment production and pigment distribution genes) can produce complex inheritance patterns, explaining deviations from classic Mendelian ratios.
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Percorso guidato
13:08Epistatic Genes
Phenotypic Ratios and Genotypic Prediction
Analyzing offspring phenotypic ratios allows inference of parental genotypes by matching observed ratios to expected Mendelian or epistatic patterns. Calculating probabilities for each phenotype helps identify which allele combinations parents likely carry, enabling prediction of both genotype and phenotype.
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Percorso guidato
07:52Gamete Genotypes
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Given the inheritance pattern of coat color in rats described in Problem 17, predict the genotype and phenotype of the parents who produced the following offspring:
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In rats, the following genotypes of two independently assorting autosomal genes determine coat color:
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Given the inheritance pattern of coat color in rats described in Problem 17, predict the genotype and phenotype of the parents who produced the following offspring:
3/8 black: 4/8 albino: 1/8 cream
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