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Ch. 5 - Genetic Linkage and Mapping in Eukaryotes
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoSanders 3rd EditionCh. 5 - Genetic Linkage and Mapping in EukaryotesProblema 1e
Capitolo 5, Problema 1e

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Progeny of the cross Rt/rT×rt/rt

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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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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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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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Chromosome Structure

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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Chi Square Analysis
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The gametes produced by an organism with the genotype Rt/rT

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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.

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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.


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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.

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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.


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