In the article “Polyploidy as a chromosomal component of stochastic noise:variable scalar multiples of the diploid chromosome complement in the invertebrate species Girardia schubarti from Brazil”, DOI https://doi.org/10.1590/1519-6984.20615, published in Brazilian Journal of Biology, Braz. J. Biol. vol.77 no.4, pp, 745-751:
Where it reads:
Where a specimen is dominated by polyploidy at numerically rational multiples (e.g. 3n, 4n, 8n) total plate count will be the denominator in calculating overall polyploid proportions so that Σ [total plate count]=2n+3n+4n+…), when 7 plates at 2n=8, 15 plates at 3n=12, 41 plates at 4n=16, 9 plates at 8n=32; Σ [total plate count]= 7+15+41+9=72. Any plate count that is a geometric scalar multiple of the polyploid dominant (e.g. 4n=16, 8n=32) is counted with/and as a component of the predominant polyploid count (e.g. 7 plates at 2n=8, 41 plates at 4n=16, 9 plates at 8n=32). The predominant polyploid plate count = 41 at 4n=16 Σ [predominant polyploidy plate count ] = 7+41+9=57. Use this sum to calculate the percentage that is the dominant polyploid component of the specimen (e.g. 57/72=0.792). Multiply that percentage by the haploid (i.e. n=4) of the specimen (e.g. 0.792×n=4=3.17). Add this result to the highest irrationally numerical scalar multiple of 2 n (e.g. 3n plus any of its rational multiples) within that specimen: Σ [predominant polyploidy plate count] = 41 (at 4n=16)+9(at 8n=32)+7 (at 2n=8) =57/72=0.792 x [n=4] =3.17 + [3n=12]= 15.17=PV
It should read:
Where a specimen is dominated by polyploidy at numerically rational multiples (e.g. 3n, 4n, 8n) total plate count will be the denominator in calculating overall polyploid proportions so that Σ [total plate count]=2n+3n+4n+…), when 7 plates at 2n=8, 15 plates at 3n=12, 41 plates at 4n=16, 9 plates at 8n=32; Σ [total plate count]= 7+15+41+9=72. Any plate count that is a geometric scalar multiple of the 2n polyploid dominant (e.g. 4n=16, 8n=32) is counted with/and as a component of the predominant polyploid count (e.g. 7 plates at 2n=8, 41 plates at 4n=16, 9 plates at 8n=32). The predominant polyploid plate count = 41 at 4n=16 Σ [predominant polyploidy plate count ] = 7+41+9=57. Use this sum to calculate the percentage that is the dominant polyploid component of the specimen (e.g. 57/72=0.792). Multiply that percentage by the haploid (i.e. n=4) of the specimen (e.g. 0.792×n=4=3.17). Add this result to the highest irrationally numerical scalar multiple of 2 n (e.g. 3n plus any of its rational multiples) within that specimen: Σ [predominant polyploidy plate count] = 41 (at 4n=16)+9(at 8n=32)+7 (at 2n=8) =57/72=0.792 x [n=4] =3.17 + [3n=12]= 15.17=PV. Wherever the dominant (rational multiple) polyploid percentage is ≥90%, the PV becomes that dominant rational polyploid scaler (e.g, 4n plate count = 9, 8n plate count = 1, dominant polyploid percentage is = 90%, PV = 16.00).
Where it reads:
Regions furnishing specimens for this investigation and their altitudes, ploidal constitution and ploidal value (PV).
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Publication Dates
-
Publication in this collection
15 June 2020 -
Date of issue
Apr-Jun 2020
