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Fig. 17 | BMC Ecology and Evolution

Fig. 17

From: Evolutionary pattern of karyotypes and meiosis in pholcid spiders (Araneae: Pholcidae): implications for reconstructing chromosome evolution of araneomorph spiders

Fig. 17

Kambiwa neotropica (X1X2X3X4Y), male meiosis, hypothesis on sex chromosome pairing. Pairing between X1 and X3 as well as X2 and X4 is more stable than the other attachments. Location of the Y microchromosome is unresolved. It is probably placed in the middle of the sex chromosome multivalent. This assumption is based on the pattern of meiotic pairing between the X chromosomes and Y microchromosome(s) in achiasmatic sex chromosome systems of haplogynes with more than two X chromosomes. Red = biarmed X chromosomes, black knob = centromere, blue = Y chromosome, orange = monoarmed X chromosomes. On the right—photograph of the sex chromosome multivalent

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BMC Ecology and Evolution

ISSN: 2730-7182

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