Sexual size dimorphism under selection

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Sexual size dimorphism under selection

Female seed beetle Callosobruchus maculatus (with darker colouration) and two males that differ in body size. In our study we used artificial selection to increase sexual size dimorphism, and the beetles in the photo show the variation in sex difference in size after selection.
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.

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