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How do we know that crossing over results from a physical exchange between chromatids?
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Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
Klug10th EditionEssentials of GeneticsISBN: 9780135588789Non è quello che usi tu?Cambia libro di testo
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Klug 10th EditionCh. 7 - Linkage and Chromosome Mapping in EukaryotesProblema 1a
Klug 10th EditionCh. 7 - Linkage and Chromosome Mapping in EukaryotesProblema 1aCapitolo 7, Problema 1a
How was it established experimentally that the frequency of recombination (crossing over) between two genes is related to the distance between them along the chromosome?
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Understand the concept: Recombination frequency between two genes is the proportion of offspring in which a crossover event has occurred between those genes during meiosis. This frequency is used as a measure of the physical distance between genes on a chromosome.
Set up a genetic cross: Researchers performed controlled crosses between organisms heterozygous for two linked genes. By analyzing the phenotypes of the offspring, they could identify recombinant and parental types based on the combination of traits inherited.
Calculate recombination frequency: The recombination frequency (RF) is calculated using the formula: \(\text{RF} = \frac{\text{Number of recombinant offspring}}{\text{Total number of offspring}} \times 100\%\). This gives the percentage of recombinant progeny, reflecting crossover events between the two genes.
Compare recombination frequencies for different gene pairs: By repeating these crosses for multiple pairs of genes located at various positions on the chromosome, researchers observed that gene pairs physically closer together had lower recombination frequencies, while those farther apart had higher frequencies.
Conclude the relationship: The consistent correlation between recombination frequency and physical distance led to the conclusion that recombination frequency is proportional to the distance between genes on a chromosome, forming the basis for genetic linkage maps.
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Genetic Recombination and Crossing Over
Genetic recombination occurs during meiosis when homologous chromosomes exchange segments, resulting in new allele combinations. Crossing over is the physical process that facilitates this exchange, and its frequency reflects how often two genes are separated during this event.
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05:19
Discovery of Crossing Over
Linkage and Genetic Mapping
Genes located close together on the same chromosome tend to be inherited together, a phenomenon called linkage. By measuring recombination frequencies between gene pairs, scientists can estimate their relative distances, creating genetic maps that represent gene order and spacing.
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07:33Chi Square and Linkage
Experimental Measurement of Recombination Frequency
Recombination frequency is experimentally determined by crossing organisms with known genotypes and analyzing offspring phenotypes. The proportion of recombinant offspring indicates how often crossing over occurs between two genes, allowing researchers to correlate recombination rates with physical gene distances.
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11:06Mathematical Measurements