Fig. 7 | Scientific Reports

Fig. 7

From: Satellitome analysis on the pale-breasted thrush Turdus leucomelas (Passeriformes; Turdidae) uncovers the putative co-evolution of sex chromosomes and satellite DNAs

Fig. 7

Idiogram representing one of the main hypotheses that involve a translocation event in T. leucomelas specimens and the resulting genotypes from possible crossings. Under this hypothesis, an ancestral female undergoes a translocation between the short arms of the W chromosome and an autosome (A). As a result, the W chromosome both acquired and lost sequences, while an autosome (A1) also lost sequences and integrated previously W-specific sequences, which included both TleSat06 and TleSat08, while its homologous remained untouched (A2). This pattern (ZW + A1A2) is observed in both T. leucomelas (TLE♀F01/F02). When crossed with a wild-type ZZ + A2A2 male (TLE♂M01), it produces an F1 offspring with four possible results: (i) ZW + A1A2 females (TLE♀F01/F02); (ii) ZW + A2A2 females (?); (iii) ZZ + A1A2 males (TLE♂M02), and (iv) ZZ + A2A2 males (TLE♂M01). A new crossing between TLE♀F01/F02 (ZW + A1A2) x TLE♂M02 (ZZ + A1A2) generates an F2 offspring with six possible results: (i) ZW + A1A2 females (TLE♀F01/F02); (ii) ZW + A2A2 females (?); (iii) ZW + A1A1 females (?); ZZ + A1A1 males (TLE♂M03/M04), and (iv) wild-type ZZ + A2A2 males (TLE♂M01). Individuals marked with (?) stand for those that we were unable to find in this work.

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