Teacher resources and professional development across the curriculum

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Unit Chapters
Genomics
Proteins & Proteomics
Evolution & Phylogenetics
Microbial Diversity
Emerging Infectious Diseases
HIV & AIDS
Genetics of Development
Cell Biology & Cancer
Human Evolution
Neurobiology
Biology of Sex & Gender
Introduction
Sex and the Y Chromosome
Paternal Inheritance
Evolution of the Y Chromosome
X Inactivation
Genetic Imprinting
Testis-Determining Factor
Hormones
Intersex
Ethics of Intersex Treatment
Homosexuality
Sex and Disease
Biodiversity
Genetically Modified Organisms
Homosexuality

There is no simple genetic test to differentiate homosexuals from heterosexuals. However, many studies of siblings have consistently found a much higher incidence of homosexuality in pairs of monozygotic (identical) twins compared to dizygotic (fraternal) twins, strongly suggesting a genetic component to homosexuality. Although there is some suggestive evidence linking variation at specific regions of the genome with the propensity for being homosexual, these studies are not yet conclusive.

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