{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 21 Invertebrates 2 pdf

Lecture 21 Invertebrates 2 pdf - „Evo-Devo‟ or the...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Evo-Devo ‟ or the study of the evolution of development Q. Why study this? A. Development is the process that gives rise to form , and so the evolution of form is brought about through the evolution of development. 1. All animals have the same basic genetic „toolkit‟ – the genes responsible for building bodies and body parts are shared by virtually all animals Humans have just 14 more genes than chimps 2. Many animal „toolkit‟ proteins exhibit functionally equivalent activity in vivo when substituted for one another Halder et al 1995 Observed that mammals and insects, which have evolved separately for more than 500 million years, share the same master control gene for eye morphogenesis So how does morphological diversity evolve? Consider a species that exists in different forms, the forms can be more distinct in terms of morphology and ecology than the adult forms of any pair of sister species Drosophila melanogaster life cycle D. melanogaster D. simulans So the Drosophila is using the identical set of toolkit proteins to create markedly different body morphologies. Achieved by regulating which genes are expressed and by when, where and how much they‟re expressed.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon