Can you do a sequence alignment with an uneven number of genes? (For phylogenetics)
Not all of my organisms in question contain all the genes I want to use for sequence alignment, can I keep them in anyway and do the alignment to create a tree?
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You can, but it is probably best to remove sparse genes (genes missing from a high percentage of taxa, say 50%, or 80%). Also, probably good to remove taxa with a high proportion of missing genes. I am not up to date with the latest literature, though, so I don't know the most accepted thresholds.
Alternatively, you can reconstruct trees on a gene by gene basis, then use some tree conciliation / supertree method to obtain the final tree.
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You could create gene specific trees in that case.