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Home Q & A Board Science-Related Homework Help Health, Nutrition, and Food Sciences
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elecfuture elecfuture
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6 years ago
Imagine a family of five children. Describe how anatomical sex relates to which of the siblings is most likely to be homosexual, and explain the hypothesized mechanism for this effect.
Textbook 
Human Sexuality in a World of Diversity, Canadian Edition

Human Sexuality in a World of Diversity, Canadian Edition


Edition: 5th
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#1
6 years ago
- Fraternal birth order effect: If the sibling group is comprised of all males, the youngest male has the highest probability of being homosexual.
- There is no influence on number of younger brothers, number of sisters, nonbiological siblings, or sibling sex ratio.
- Mechanism: The maternal immune system produces antibodies in response to each male fetus, a response which strengthens with each subsequent male offspring and influences sexual differentiation of the male brain.
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