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Table 2 Tandemly and segmentally duplicated StKFB pairs in potato and inference of duplication time

From: Genome-wide identification, evolutionary and functional analyses of KFB family members in potato

Gene pairs

Type of gene duplication

Chr. location

Ka

Ks

Ka/Ks

Approximate duplication date (Mya)

StKFB15/StKFB16

Tandem duplication

Chr03

0.370878414

1.744689634

0.212575582

58.15632113

StKFB40/StKFB41

Tandem duplication

Chr11

0.191360755

0.293117307

0.652847

9.7705769

StKFB15/StKFB29

Segmental duplication

Chr3/Chr6

0.216198333

0.844230721

0.256089157

28.141024

  1. Ka/Ks is the ratio of the number of non-synonymous substitutions per non-synonymous site (Ka) to the number of synonymous substitutions per synonymous site (Ks). This ratio is used as indicator to determine the selective pressure or strength on a protein-encoding gene. “Ka/Ks = 1” shows “no selection”, “Ka/Ks < 1” indicates “negative or purifying selection” and “Ka/Ks > 1” shows “positive or Darwinian selection”