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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 1d
Capitolo 5, Problema 1d

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

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Step 1: Understand the genotype Rt/rT. This represents a heterozygous organism where the alleles for two genes (R and T) are located on homologous chromosomes. The slash (/) separates the alleles on the two homologous chromosomes. One chromosome has the alleles R and t, while the other has r and T.
Step 2: Draw a diagram of the homologous chromosomes. On one chromosome, place the alleles R and t in the order given. On the homologous chromosome, place the alleles r and T in the same order. This will visually represent the genotype Rt/rT.
Step 3: Recall the concept of independent assortment and crossing over. During gamete formation (meiosis), homologous chromosomes can segregate independently, and crossing over can occur between them, leading to different combinations of alleles in the gametes.
Step 4: Determine the possible gametes. Without crossing over, the organism can produce two types of gametes: Rt and rT. If crossing over occurs between the genes, recombinant gametes (RT and rt) can also be produced. Thus, the possible gametes are Rt, rT, RT, and rt.
Step 5: Summarize the results. The organism with the genotype Rt/rT can produce four types of gametes: Rt, rT, RT, and rt. The proportions of these gametes depend on the frequency of crossing over between the R and T loci, which is influenced by their physical distance on the chromosome.

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Homologous Chromosomes

Homologous chromosomes are pairs of chromosomes in a diploid organism that have the same structure and gene sequence but may carry different alleles. Each parent contributes one chromosome to the pair, resulting in genetic variation. Understanding homologous chromosomes is essential for visualizing how alleles are arranged and inherited during gamete formation.
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Chromosome Structure

Alleles

Alleles are different versions of a gene that can exist at a specific locus on a chromosome. In the context of the genotype Rt/rT, 'R' and 'r' represent different alleles for one gene, while 't' and 'T' represent different alleles for another gene. The combination of these alleles determines the organism's traits and is crucial for understanding genetic variation and inheritance patterns.
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New Alleles and Migration

Gamete Formation

Gamete formation, or gametogenesis, is the process by which diploid cells undergo meiosis to produce haploid gametes. During this process, alleles segregate so that each gamete receives one allele from each gene pair. For the genotype Rt/rT, the possible gametes produced would reflect the combinations of these alleles, which is key to predicting offspring genotypes in genetic crosses.
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Formation of Plant Gametes
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Domanda del libro di testo

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.

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Domanda del libro di testo

Give the information requested.


Progeny of the cross Rt/rT×rt/rt

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Domanda del libro di testo

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

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Domanda del libro di testo

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.


AB/ab

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Domanda del libro di testo

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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Domanda del libro di testo

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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