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Fig. 4 | BMC Biology

Fig. 4

From: Genome assembly of the basket willow, Salix viminalis, reveals earliest stages of sex chromosome expansion

Fig. 4

Examples of phylogenetic trees between gametologous gene pairs in the basket willow SDR. a, b The W-linked copy of the female gametolog is more divergent and does not cluster with the other S. viminalis haplotypes, indicating that suppression of recombination in stratum I occurred prior to S. viminalis speciation. c, d The female W-linked copy clusters within the species’ branch suggesting that recombination has been halted more recently. Female S. viminalis gametologs are indicated with red squares, and male haplotypes are in blue. Trees were estimated by maximum likelihood. Bootstrap values > 75% are indicated with black dots on the respective nodes. The poplar (P. trichocarpa) ortholog was used to root the trees

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