Hox genes are important primarily because they regulate $q,$

gene expression during embryonic development $($e$.$g$.,$ affecting appendage length$/$location$)$

energy processing of the individual; thereby affecting fitness

immune system responses to Pox viruses $($e$.$g$.,$ chicken pox$)$

lower coelom development, including internal organs

reproductive capacity in adulthood and therefore Darwinian fitness

Hox genes are important primarily because they regulate $q,$

gene expression during embryonic development $($e$.$g$.,$ affecting appendage length$/$location$)$

energy processing of the individual; thereby affecting fitness

immune system responses to Pox viruses $($e$.$g$.,$ chicken pox$)$

lower coelom development, including internal organs

reproductive capacity in adulthood and therefore Darwinian fitness

Hox genes are important primarily because they regulate $q,$

gene expression during embryonic development $($e$.$g$.,$ affecting appendage length$/$location$)$

energy processing of the individual; thereby affecting fitness

immune system responses to Pox viruses $($e$.$g$.,$ chicken pox$)$

lower coelom development, including internal organs

reproductive capacity in adulthood and therefore Darwinian fitness

Hox genes are important primarily because they regulate $q,$

gene expression during embryonic development $($e$.$g$.,$ affecting appendage length$/$location$)$

energy processing of the individual; thereby affecting fitness

immune system responses to Pox viruses $($e$.$g$.,$ chicken pox$)$

lower coelom development, including internal organs

reproductive capacity in adulthood and therefore Darwinian fitness

Hox genes are important primarily because they regulate $q,$

gene expression during embryonic development $($e$.$g$.,$ affecting appendage length$/$location$)$

energy processing of the individual; thereby affecting fitness

immune system responses to Pox viruses $($e$.$g$.,$ chicken pox$)$

lower coelom development, including internal organs

reproductive capacity in adulthood and therefore Darwinian fitness