The hierarchical nature of gene regulation and development, and the combination

Question

The hierarchical nature of gene regulation and development, and the combination control of gene expression via regulatory elements allow for enormous variation in development. standpoint of EVOLUTION there is/can be a high level of both and Proto-evolution Epigenetic stasis Evolvability Developmental flexibility We discussed three (3) main stages of the specification process and how species form. From the list below choose the 3 correct stages. Isolation (gene flow reduced or stopped) Convergence with intraspecies Divergence (in traits) Reinforcement of reproductive isolation Inclusion (gene flow increased) One problem with the Biological Species Concept is that genetically distinct populations may

Explanation / Answer

23. Three stages of speciation are 1. Isolation from the existing population- move to different regions or stay isolated 2. Divergence of traits - development of different traits according to environment 3. reinforcement of reproductive isolation - when groups of a same species are reunited and cannot interbreed with each other anymore and they are therefore identified as different species.

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