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Sex chromosomes influence physical differences between male and female animals, such as feather patterns in mandarin ducks. In most animals, sex chromosomes help determine whether an individual develops as a male or female. Sexes of some animals, such as most male arachnids, lack a second sex chromosome entirely. These chromosomes contribute to the physical differences between males and females. Birds with ZZ sex chromosomes, for example, are male and tend to be more colorful, whereas ZWs are females with typically blander plumage. Researchers hypothesize that animals with mismatched sex chromosomes, such as XY male mammals, could be more vulnerable to genetic mutations, which could result in a shorter life span.
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Animal Sex: News and Features - News and Scientific Articles on Live Science

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The secret to a long life? Matching sex chromosomes

Dating apps have reduced the ritual of human coupling down to a swipe. Creatures of all sorts have evolved some pretty spectacular strategies to woo their mates and ensure their genes carry on. Here are just a few examples of extreme courtship and copulation that put us tech-savvy humans to shame. Like humans, giraffes undergo cycles of fertility. Pratt and Virginia H.
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From an evolutionary and biological perspective, animals are driven to have sex in order to procreate. But there is a lot more to sexual relations between animals. Animal sex is at least as strange and varied as human sex. A male might copulate with many females.
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