Leaf trichomes may serve several biological functions including protection against herbivores, drought, and UV radiation; and their adaptive value can be expected to vary among environments. The perennial, self-incompatible herb Arabidopsis lyrata is polymorphic for trichome production, and occurs in a glabrous and a trichome-producing form. Controlled crosses indicate that the polymorphism is ...

Petals appear in many angiosperm taxa, yet when and how these attractive organs originated remains unclear. Phylogenetic reconstructions based on morphological data suggest that petals have evolved multiple times during the radiation of the angiosperms. Based on the diversity of petal morphologies, it is likely that the developmental programmes specifying petal identity are distinct in differen...

This paper sets out a new research agenda for the study of family historians’ (referred to as ‘genealogists’) use of genetic ancestry tests in the course of their family history research in postcolonial Britain. My focus is upon the ways in which the use of these tests shapes the formation of genealogists’ ethnic, racial, national, class and gender identities and their ancestries. I argue that,...