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Males with different Y chromosome haplotypes

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Males with different Y chromosome haplotypes

The males differ in body size when they are otherwise genetically identical but differ in their Y chromosome.
Elina Immonen
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Elina Immonen
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  • Callosobruchus maculatus beetle and their host plant Vigna radiata. Credit: Paula Vasconcelos

    Male Y chromosome facilitates the evolution of sex differences in body size

    Females and males differ in many ways and yet they share the same genome. The only exception is the male Y chromosome. Using beetles as a study system, new research from Uppsala University, now published in Nature Ecology & Evolution, shows that despite of the Y chromosome containing very few genes, it can dramatically change male body size and thus facilitate the evolution of sex differences.