A final recovery plan for the Southern Resident killer whales [pdf] [ MB] was published on January 24, 2008. The Recovery Plan for Southern Resident Killer Whales was based on the Proposed Conservation Plan for Southern Resident Killer Whales (under the MMPA), after comments on it were addressed and required ESA elements incorporated into it. The proposed ESA recovery plan was released for comment in November 2006. Public and peer review comments as well as new research results and references were then incorporated into the final Southern Resident recovery plan.
The development of an organism — from a fertilized egg, through embryonic and juvenile stages, to adulthood — requires the coordinated expression of sets of genes at the proper times and in the proper places. Studies of several bizarre mutations in the fruitfly, Drosophila , provided keys to understanding the molecular basis of large-scale developmental plans. Early embryonic genes express proteins that set up the orientation and define the body segments of the fly embryo. Then "homeotic" genes act on the segments to make the body parts distinct to each segment.