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SGD Help: Historical Genetic Mapping Data

Historical Genetic Mapping Data is included in three separate places in SGD: the Genetic Mapping Data page is a listing of all the genetic crosses submitted to SGD for a particular gene. Both tetrad and centromere segregation experiments are included, and details of these experiments can be accessed from the Genetic Mapping Data table. The Tetrad Data page summarizes the results of all of the tetrad data submitted to SGD for a pair of genetic markers; the Centromere Segregation Data page summarizes the results of all of the Centromere Segregation Data submitted to SGD for a particular locus.

Contents

  1. Genetic Mapping Data
  2. Tetrad Data
  3. Centromere Segregation Data

Genetic Mapping Data

The Genetic Mapping Data can be accessed from links on the Physical and Genetics Maps, and the Genetic Maps, pages of the Historical Data section in the Community pull down. Clicking on the link "Two-point Genetic Mapping Data" brings up a search page where you can enter your gene of interest; the resulting page shows the Genetic Mapping Data table.

Genetic Mapping Data table

The Genetic Mapping Data table lists the following information:

Markers used in the cross the markers used in the cross are listed in the Locus #1 and Locus #2 columns. Click on the gene names to view their Locus pages.
# of Experiments number of mapping experiments done for each pair of markers. Click on the number to view the detailed data from each of the experiments.
Average Distance the average distance, in centimorgans, calculated from all the distances from the mapping experiments listed here.
Genetic Map Distance the distance calculated from the Genetic Map Edition 12 (Cherry JM, Ball C, Weng S, Juvik G, Schmidt R, Adler C, Dunn B, Dwight S, Riles L, Mortimer RK, Botstein D. Nature 387(6632S):67-73 (1997)).

The Genetic Mapping Data can be downloaded in a tab-delimited format via the Download Data link on the page.

Tetrad Data

Tetrad data for a gene is accessed by clicking on the number in the "# of Experiments" column of the Genetic Mapping Data table.

The Tetrad Data table

The Tetrad Data table lists the following information. Below the table are any notes about either (or both) of the genetic markers.

Cross the name of the experiment/cross; consists of the marker allele names used in the cross.
Parental Ditype the number of tetrads that were parental ditypes.
Nonparental Ditype the number of tetrads that were nonparental ditypes.
Tetratype the number of tetrads that were tetratypes.
Distance the genetic distance, in centimorgans, calculated from the number of parental ditypes, nonparental ditypes, and tetratypes.
Distance Standard Error the standard error of the calculated distance.
Interference the interference in the cross.
Interference Standard Error the standard error of the calculated interference.
Notes/References the notes and references relevant to the cross. The numbers link to the corresponding note or reference at the bottom of the page.

Tetrad Data can be downloaded in a tab-delimited format via the Download Data link on the page.

Centromere Segregation Data

Centromere segregation data is accessed by clicking on the number in the "# of Experiments" column of the Genetic Mapping Data table.

The Centromere Segregation Data Table

The Centromere Segregation Data Table lists the following information. Below the table are any notes about the genetic markers.

Cross the name of the experiment/cross; consists of the marker allele names used in the cross.
First Division number of first division segregants.
Second Division number of second division segregants.
Distance the genetic distance, in centimorgans, calculated from the number of first division and second division segregants.
Distance Standard Error the standard error of the calculated distance.
Interference the interference in the cross.
Interference Standard Error the standard error of the calculated interference
Notes/References the notes and references relevant to the cross. The numbers link to the corresponding note or reference at the bottom of the page.

Centromere Segregation Data can be downloaded in a tab-delimited format via the Download Data link on the page.