A contig map of one segment of chromosome 3 of Arabidopsis...

A contig map of one segment of chromosome 3 of Arabidopsis is shown as follows. (a) If an EST hybridizes with genomic clones $C, D,$ and $\mathrm{E},$ but not with the other clones, in which segment of chromosome 3 is the EST located? (b) If a clone of gene $A R A$ hybridizes only with genomic clones $C$ and $D,$ in which chromosome segment is the gene located? (c) If a restriction fragment hybridizes with only one of the genomic clones shown above, in which chromosome segment(s) could the fragment be located?

A contig map of one segment of chromosome 3 of Arabidopsis is shown as follows.
(a) If an EST hybridizes with genomic clones $C, D,$ and
$\mathrm{E},$ but not with the other clones, in which segment of chromosome 3 is the EST located? (b) If a clone of gene $A R A$ hybridizes only with genomic clones $C$ and $D,$ in which chromosome segment is the gene located?
(c) If
a restriction fragment hybridizes with only one of the genomic clones shown above, in which chromosome segment(s) could the fragment be located?

Key Concepts

Gene Mapping and Localization

Gene mapping and localization involve techniques such as hybridization and restriction fragment analysis to determine the precise location of genes on a chromosome. This process is critical for understanding gene organization, function, and for applications such as gene cloning or mutation analysis.

Expressed Sequence Tag (EST)

An EST is a short sub-sequence of a cDNA clone derived from a messenger RNA. ESTs are used as markers to identify regions of active gene expression within the genome, facilitating the localization of expressed genes on a physical map.

Restriction Fragment Analysis

Restriction fragment analysis involves cutting DNA samples with restriction enzymes that target specific sequences, resulting in fragments of varying lengths. By determining which clone contains a particular restriction fragment, researchers can further refine the mapping of sequences to specific regions on the chromosome.

Contig Map

A contig map is a representation of a series of overlapping DNA clones that collectively cover a continuous segment of a chromosome. It is used to determine the order and relative positions of DNA fragments, aiding in the physical mapping of a genome.

Hybridization Techniques

Hybridization techniques involve the pairing of complementary DNA (or RNA) sequences. In the context of physical mapping, hybridization is used to determine which genomic clones contain a specific sequence such as an expressed sequence tag (EST) or gene fragment, thereby helping to pinpoint its location on the contig.

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