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Genes may crossover before segregating. The frequency of crossover gives rise to mapping genes on chromosomes. THe larger the mapping distance, the more likely they are to crossover.

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Diagram of gene mapping

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You can use a sample of blood or saliva to accomplish gene mapping. 

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You can use a sample of blood or saliva to accomplish gene mapping. 

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Scientist have been able to located genes that are responsible for conditions like cystic fibrosis and more common conditions such as heart disease, cancer, diabetes, and psychiatric conditions.  

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Scientist have been able to located genes that are responsible for conditions like cystic fibrosis and more common conditions such as heart disease, cancer, diabetes, and psychiatric conditions.  

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Through gene mapping, one can link a disease passed from parent to child on one or more genes. They then can trace the precise location you can find the gene on the chromosome.

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Through gene mapping, one can link a disease passed from parent to child on one or more genes. They then can trace the precise location you can find the gene on the chromosome.

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Exploring gene mapping was one of the main goals of the Human Genome Project.

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Exploring gene mapping was one of the main goals of the Human Genome Project.

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Gene mapping can be defined as the methods used to locate genes on individual chromosomes. 

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Gene mapping can be defined as the methods used to locate genes on individual chromosomes. 