Opposites Attract in Human Search for Mate
When it comes to choosing a mate, opposites really do attract, according to a 8razilian study that found people are subconsciously more likely to choose a partner whose genetic make-up is different to their own.
They found evidence that married couples are more likely to have genetic differences in a DNA region governing the immune system than were randomly matched pairs.
This was likely to be an evolutionary strategy to ensure healthy reproduction because genetic variability is an advantage for offspring, Maria da Graca Bicalho and her col1eagues at the University of Parana in Brazil reported.
"Although it may be tempting to think humans choose their partners because of their similarities, our research has shown clear1y that it is differences that make for successful reproduction, and that the University drive have healthy children is important when choosing a mate." Bicalho said in a statement.
Scientists said it was not c1ear what signals attract the body to people who are genetical1y dissimilar to themselves, but suggested body odor or even face structure could play a role.
Bicalho said the team compared genetic data from 90 married couples with data from 152 random1y generated control couples.
They found the real couples had significantly more dissimilarities in MHC.
"Parents with dissimilar (genetic regions) could provide their offspring with a better chance to ward infections off because their immune system genes are more diverse," they wrote in a summary.
Previous studies have suggested animals may use body odor as a guide to identify possible mates as being genetically similar or dissimilar, she added, but other physical factors may also be involved.
"Other cues such as face symmetry might play a role as well, but they are still in the field of speculation," she said.
1. They found evidence that married couples are more likely to have genetic differences in a DNA region governing the immune system than were randomly matched pairs.
本句是一个复合句，主句是They found evidence。 that引导同位语从句，解释说明evidence。其中governing the immune system现在分词短语作后置定语修饰DNA region。
2. Although it may be tempting to think humans choose their partners because of their similarities, our research has shown clear1y that it is differences that make for successful reproduction, and that the University drive have healthy children is important when choosing a mate.
本句是一个复合句。 Although引导让步状语从句。后面第一个that引导宾语从句，作shown的宾语，其中it is...that...是强调句型，对difference进行强调。第三个that同样引导宾语从句，作shown的宾语。其中to have healthy children不定式短语作后置定语，修饰 subconscious drive。 when choosing a mate为现在分词短语做时间状语。
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