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Table 2 Properties of Sequence Data Partitions Based on Sequenced Region, Codon Position and Genome Location

From: Independent Origins of New Sex-Linked Chromosomes in the melanica and robusta Species Groups of Drosophila

Data set

PIS

Empirical base frequency

Rates

Ts:Tv rate (MP Tv:Ts)a

Shape

Pinvar

ML Model

COI 1,2,3

165

A = 0.278

C = 0.146

G = 0.174

T = 0.402

A-C = 0.000

A-G = 21.995

A-T = 21.885

C-G = 0.000

C-T = 72.908

G-T = 1.000

2.287

(2:1)

2.100

0.631

GTR+I+G

COI 1,2

32

A = 0.201

C = 0.203

G = 0.243

T = 0.353

A-C = 0.000

A-G = 3.156

A-T = 4.787

C-G = 0.000

C-T = 72.078

G-T = 1.000

10.024

(10:1)

-

0.867

GTR+I

COI 3

133

A = 0.446

C = 0.071

G = 0.031

T = 0.448

A-C = 0.0000

A-G = 12.996

A-T = 0.207

C-G = 0.000

C-T = 4.894

G-T = 1.000

5.275

(5:1)

0.769

0.063

GTR+I+G

COII 1,2,3

158

A = 0.319

C = 0.118

G = 0.139

T = 0.424

A-C = 7.139

A-G = 24.723

A-T = 16.552

C-G = 0.000

C-T = 155.021

G-T = 1.000

4.489

(4:1)

2.676

0.647

GTR+I+G

CoII 1,2

32

A = 0.285

C = 0.158

G = 0.188

T = 0.370

A-C = 8.528

A-G = 10.570

A-T = 0.000

C-G = 0.000

C-T = 48.380

G-T = 1.000

7.542

(8:1)

-

0.873

GTR+I

COII 3

126

A = 0.431

C = 0.083

G = 0.025

T = 0.463

A-C = 0.4255

A-G = 38.165

A-T = 0.175

C-G = 0.000

C-T = 22.982

G-T = 1.000

6.592

(6:1)

0.516

0.223

HKY+G

Mt 1,2,3

323

A = 0.295

C = 0.134

G = 0.155

T = 0.417

A-C = 1.510

A-G = 22.441

A-T = 18.857

C-G = 0.000

C-T = 94.312

G-T = 1.000

3.045

(3:1)

2.113

0.638

GTR+I+G

Mt 1,2

64

A = 0.239

C = 0.185

G = 0.218

T = 0.359

A-C = 5.798

A-G = 13.824

A-T = 2.814

C-G = 0.000

C-T = 70.327

G-T = 1.000

8.718

(9:1)

-

0.876

GTR+I

cac

113

A = 0.224

C = 0.211

G = 0.224

T = 0.341

A-C = 4.291

A-G = 9.301

A-T = 1.607

C-G = 2.422

C-T = 9.301

G-T = 1.000

2.204

(2:1)

0.629

0.455

TVM+I+G

cac 3

97

A = 0.2481

C = 0.251

G = 0.277

T = 0.243

A-C = 2.416

A-G = 4.943

A-T = 1.835

C-G = 1.620

C-T = 4.874

G-T = 1.000

2.178

(2:1)

0.912

0.293

K80+G

sc

235

A = 0.236

C = 0.337

G = 0.252

T = 0.176

A-C = 1.000

A-G = 3.329

A-G = 2.094

C-G = 2.094

C-T = 4.472

G-T = 1.000

1.190

(1:1)

0.451

0.000

TIM+I+G

sc 3

127

A = 0.134

C = 0.134

G = 0.134

T = 0.410

A-C = 2.142

A-G = 3.837

A-T = 2.040

C-G = 0.000

C-T = 72.078

G-T = 1.000

1.516

(2:1)

2.247

0.124

HKY+G

Nu

348

A = 0.231

C = 0.276

G = 0.236

T = 0.257

A-C = 1.980

A-G = 5.834

A-G = 1.745

C-G = 1.670

C-T = 4.294

G-T = 1.000

1.447

(1:1)

0.285

0.000

TVM+G

Nu + mt 1,2,3

671

A = 0.266

C = 0.215

G = 0.190

T = 0.329

A-C = 2.873

A-G = 11.868

A-G = 8.568

C-G = 7.867

C-T = 20.930

G-T = 1.000

1.574

2:1

1.352

0.546

GTR+I+G

Nu + mt 1,2

412

A = 0.235

C = 0.244

G = 0.226

T = 0.295

A-C = 3.112

A-G = 8.2980

A-G = 1.912

C-G = 5.240

C-T = 10.717

G-T = 1.000

1.814

(2:1)

0.898

0.582

GTR+I+G

  1. Note : Nucleotide composition, transformation rates and models of nucleotide change obtained from the Akaike Information Criterion test as implemented in ModelTest.a Transversions (Tv)/Transitions (Ts) ratios used in differential weighting in the MP analysis. CoI = cytochrome oxidase I; CoII = cytochrome oxidase II, cac = cacophony; sc = scute; Mt = mitochondrial genes; Nu = nuclear genes; PIS = number of parsimony-informative sites; Pinvar = proportion of invariant sites; Shape = shape parameter of the gamma distribution. 1, 2 and 3 indicate first, second and third codon positions, respectively.