Which of the Following Organic Explanations Has Been Offered to Explain

question 48

Multiple Choice

Which of the following organic explanations has been offered to explain the fraternal birth-order effect?

• A) The fraternal birth-order effect has no organic explanation. It is simply a trend that has not been shown to have any real evidence or relevance to the discussion of sexual orientation.
• B) The Y-chromosome activates a gene more forcefully in each consecutive male birth, which is why this order effect applies to male and not female babies.
• C) The rules of biology state that the only way for two boys to be born consecutively is if there is a genetic mutation. This mutation is thought to explain the fraternal birth-order effect.
• D) There is a defensive maternal immune response that is triggered by foreign substances produced by each additional male fetus, and this immune response increases with each additional male pregnancy.

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