Measuring tools to map distance
, angles, areas and proportions for surgical planning
The Kosambi mapfunction (Kosambi, 1944) was used to convert recombination frequency to genetic map distance
in centi Morgan (cM).
Thirty-four plus percent recombination or 34 map units is a much better estimate of the true recombination frequency between sepia and ebony but is still less than the official map distance
probably because of the underestimation of the recombination frequency due to the inability to detect double crossovers, as well as other factors.
Marker order and map distance
in the Satt220-Satt536 interval were accurately determined using 92 recombinants (two plants derived from both recombinant gametes, and the rest from one recombinant gamete and one parental gamete) identified from 1911 B[C.
An error of over 11% for shapes that represent T-junctions in road maps constitutes a considerable overestimation of the relevant map distance
To examine the relationship between genetic diversification of populations and their geographic relationships, a measure of genetic differentiation can be regressed against map distance
Linkage map distance
(cM) = 1/4 A- ln (1+2r)/(1-2r).
e] c + 1), where c is linkage map distance
in Morgans (Sved, 1971).
Using Table 1, students determine the approximate map distance
between their two linked genes.
50 cM (1) Single linkage group 33 Multiple linkage group BTA1 49 BTA2 40 BTA3 52 BTA4 36 BTA5 39 BTA6 45 BTA7 42 BTA8 52 BTA9 35 BTA10 44 BTA11 43 BTA12 35 BTA13 41 BTA14 28 BTA15 24 BTA16 32 BTA17 39 BTA18 41 BTA19 28 BTA20 28 BTA21 30 BTA22 29 BTA23 21 BTA24 19 BTA25 28 BTA26 25 BTA27 24 BTA28 26 BTA29 20 Total 995 (1) Average map distance
between flanking QTL loci was 3.
Number of markers ([dagger]) Published NIL Linkage group populations Map distance
Total SSR RFLP cM A1 73.
Mapped loci covered a total map distance
of approximately 1660 cM.