Textbook Question
Two parents plan to have three children. What is the probability that the children will be two girls and one boy?
Ch. 2 - Transmission Genetics
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172
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Table of contents
- 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: 9780135564172Not the one you use?Change textbook
Chapter 2, Problem 6a
Consider the cross AaBbCC × AABbCc.
How many different gamete genotypes can each organism produce?
Verified step by step guidance1
Step 1: Understand the problem. The question asks how many different gamete genotypes can be produced by each organism in the given cross. Gametes are formed through meiosis, where alleles segregate independently according to Mendel's laws.
Step 2: Analyze the genotype of the first organism (AaBbCC). For each gene, determine the number of allele combinations that can be passed to the gametes. Gene A has two alleles (A and a), Gene B has two alleles (B and b), and Gene C has only one allele (C, since it is homozygous). The total number of gamete genotypes is calculated by multiplying the number of allele combinations for each gene: 2 × 2 × 1.
Step 3: Analyze the genotype of the second organism (AABbCc). Gene A has only one allele (A, since it is homozygous), Gene B has two alleles (B and b), and Gene C has two alleles (C and c). The total number of gamete genotypes is calculated by multiplying the number of allele combinations for each gene: 1 × 2 × 2.
Step 4: Use the formula for calculating the number of gamete genotypes: \( \text{Number of gamete genotypes} = \text{Number of allele combinations for Gene A} \times \text{Number of allele combinations for Gene B} \times \text{Number of allele combinations for Gene C} \). Apply this formula to each organism's genotype.
Step 5: Summarize the results. The first organism (AaBbCC) produces gametes based on the combinations of alleles from its genotype, and the second organism (AABbCc) produces gametes based on its genotype. Multiply the allele combinations for each gene to determine the number of gamete genotypes for each organism.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Gamete Formation
Gamete formation is the process by which organisms produce reproductive cells (gametes) through meiosis. Each gamete carries half the genetic information of the parent organism, resulting in a unique combination of alleles. Understanding how alleles segregate during gamete formation is crucial for predicting the genetic outcomes of crosses.
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Independent Assortment
Independent assortment is a principle of genetics stating that alleles for different traits segregate independently of one another during gamete formation. This means that the inheritance of one trait does not affect the inheritance of another, allowing for a variety of combinations in the gametes produced by an organism.
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Punnett Square
A Punnett square is a diagram used to predict the genotypes of offspring from a genetic cross. By organizing the possible gametes from each parent, it allows for a visual representation of how alleles combine, making it easier to calculate the number of different genotypes that can arise from a given cross.
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Related Practice
Textbook Question
A woman, S.R., had a maternal grandfather with hemophilia A (OMIM 306700), an X-linked recessive condition that reduces blood clotting. S.R.'s maternal grandmother and paternal grandparents are free of the condition, as are her partner, his parents, and his grandparents. S.R. has no siblings. She wants to know the chance that a son of hers will have the condition. What is that probability?
Textbook Question
A 40-year-old woman whose father had Huntington disease currently shows no symptoms of the disease. She is newly pregnant with her first child and seeks your best estimate of the chance her child will inherit the disease. What is your estimate and how did you arrive at it? (Hint: See Figure 4.11)
Textbook Question
Consider the cross AaBbCC × AABbCc.
Use a Punnett square to predict the expected ratio of offspring phenotypes.
Textbook Question
Consider the cross AaBbCC × AABbCc.
Use the forked-line method to predict the expected ratio of offspring phenotypes.
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Textbook Question
If a chi-square test produces a chi-square value of 7.83 with 4 degrees of freedom,
In what interval range does the P value fall?