How are shared ancestral characters and shared derived characters different? How is the concept of homology related to these concepts?

Swordtails, platyfish and Poecilia species are incapable of interbreeding with each other but swordtail species 1 can produce viable hybrids with swordtail species 2. In addition, both Poecilla fish, platyfish, and swordtails can all be distinguished genetically, but swortail species 1 and 2 cannot be genetically distinguished. Using this information indicate how many distinct 1) Biological, 2) morphological, and 3) phylogenetic species would be found in this group of fish. If you cannot determine this for any of the 3 species categories, state what you would need to know in order to do so. Edit View Insert Format Tools Table 12pt v Paragraph v BIUAv er Tv: 1. There are four 2.

What are the four processes that lead to the evolution of new genes from a single ancestral gene?

Given the distribution of Hox genes among animals, what would you predict about the number and type of Hox genes in the common ancestor of all animals?