Do all deer share a common ancestor?

[Rumraket (Mikkel R.)]

@colewd

Deleterious mutations (see Glossary) **cause loss or alteration of normal gene function, leading to reductions of organismal fitness . While fitness in nature and fitness under domestication often have overlapping criteria, the primary scope of this review concerns fitness under domestication.

Do you disagree with this definition?

I endorse that definition wholeheartedly.

I endorse it because it correctly identifies that the defining attribute of deleterious mutations is their effect on fitness.

That they cause…
reductions of organismal fitness
reductions of organismal fitness
reductions of organismal fitness
reductions of organismal fitness
reductions of organismal fitness

Do I need to call 911? If you give me your address I will make sure you get help. I say this because you might be suffering a clotting issue in the brain this very moment. Do you need help?