Textbook Question
Draw a diagram illustrating the alleles on homologous chromosomes for the genotypes given, assuming in each case that the genes reside on the chromosome in the order written.
aBc/abC
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Ch. 5 - Genetic Linkage and Mapping in Eukaryotes
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 5, Problem 1e
Give the information requested.
Progeny of the cross Rt/rT×rt/rt
Verified step by step guidance1
Step 1: Understand the problem. The cross involves two parents with specific genotypes: Rt/rT (heterozygous for two genes) and rt/rt (homozygous recessive for both genes). The goal is to determine the progeny genotypes and their arrangement on homologous chromosomes.
Step 2: Draw the homologous chromosomes for the first parent (Rt/rT). Represent the alleles on two homologous chromosomes, with 'R' and 't' on one chromosome and 'r' and 'T' on the other. Ensure the genes are shown in the order written (R and T).
Step 3: Draw the homologous chromosomes for the second parent (rt/rt). Since this parent is homozygous recessive, both homologous chromosomes will carry the 'r' and 't' alleles in the same order.
Step 4: Determine the possible gametes produced by each parent. The first parent (Rt/rT) can produce gametes with the following combinations of alleles: Rt, rT, RT, and rt (depending on recombination). The second parent (rt/rt) can only produce gametes with the 'rt' combination.
Step 5: Use a Punnett square to combine the gametes from both parents and determine the genotypes of the progeny. For each combination, draw the homologous chromosomes showing the arrangement of alleles for the resulting genotype.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alleles and Genotypes
Alleles are different versions of a gene that can exist at a specific locus on a chromosome. Genotypes refer to the genetic constitution of an individual, represented by the combination of alleles inherited from each parent. Understanding how alleles interact and combine is crucial for predicting the traits of offspring in genetic crosses.
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03:03
New Alleles and Migration
Homologous Chromosomes
Homologous chromosomes are pairs of chromosomes, one inherited from each parent, that contain the same genes but may have different alleles. In a genetic diagram, it is important to represent these chromosomes accurately to visualize how alleles are distributed during meiosis and fertilization, which ultimately affects the genotype of the progeny.
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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 alleles of each parent, it allows for the visualization of all possible combinations of alleles in the progeny. This tool is essential for understanding inheritance patterns and calculating the probabilities of different genotypes resulting from a specific cross.
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18:27Chi Square Analysis
Related Practice
Textbook Question
Draw a diagram illustrating the alleles on homologous chromosomes for the genotypes given, assuming in each case that the genes reside on the chromosome in the order written.
DFg/DFG
516
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Textbook Question
Give the information requested.
The gametes produced by an organism with the genotype Rt/rT
440
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Textbook Question
In a diploid species of plant, the genes for plant height and fruit shape are syntenic and separated by 18 m.u. Allele D produces tall plants and is dominant to d for short plants, and allele R produces round fruit and is dominant to r for oval fruit.
A plant with the genotype DR/dr produces gametes. Identify gamete genotypes, label parental and recombinant gametes, and give the frequency of each gamete genotype.
763
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Textbook Question
In a diploid species of plant, the genes for plant height and fruit shape are syntenic and separated by 18 m.u. Allele D produces tall plants and is dominant to d for short plants, and allele R produces round fruit and is dominant to r for oval fruit.
Give the same information for a plant with the genotype Dr/dR.
756
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Textbook Question
A pure-breeding tall plant producing oval fruit as described in Problem 2 is crossed to a pure-breeding short plant producing round fruit.
The F₁ are crossed to short plants producing oval fruit. What are the expected proportions of progeny phenotypes?
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