Back to Unit Page Unit Textbook Chapter Animations & Images Expert Interview Transcripts Unit Glossary Related Resources View List with Icons Images David Reimer and his brother Genes involved in human sex determination Head of Drosophila melanogaster Human chromosomes Human chromosomes Human chromosomes Janet Reimer holding her twins, Bruce and Brian Paternal and maternal lineages Pathways leading to sex development in mammals The evolution of the Y chromosome X and Y chromosomes Y chromosome

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