Are fetuses parasites?

Jooze

What are the requirements to be a parasite? There is an argument suggesting that fetuses are considered parasites, since they leech nutrients from their host, in this case, their mother.

It feels like the obvious answer is that fetuses are not parasites, but I want to know why.

Thanks in advance.

berkeman

Welcome to the PF. Could you provide links to articles that take one position or the other? That would help us to not duplicate stuff that you already have read. What is the context of your question?

Andy Resnick

abortion rhetoric aside, fetal physiology is fairly well studied. My text (http://www.elsevier.com/wps/find/boo...on#description) is at work, however IIRC the fetus takes Calcium from the mother; usually this presents no problem but loss of bone in the mother is a possibility:

http://www.endotext.org/pregnancy/pr...pregnancy3.htm

Maternal malnutrition results in a poorly developed fetus; the fetus does not cannibalize the mother.

Math Is Hard

*waiting patiently for a joke about teenagers*

berkeman

Pythagorean

It's definitely symbiotic in the long term in most cases.

elect_eng

I think it is clear that fetuses are not parasites. This is not my field, so I can't be sure of the answer to the question, why. However, I suspect one reason relates to the issue of genetic reproduction. A true parasite is trying to pass on it's own genes and steals nutrients from a host, while a mother is trying to pass on its own genes. ... or, something like that, although I'm sure I'm not saying it correctly.

DaveC426913

*waiting patiently for a joke about teenagers*




While fetii may be functionally parasitic, I expect true parasitism disqualifies genetic kin from the equation, including only other species.

Alternately, if you consider the Selfish Gene (that we are merely vehicles for our genes to get around in), parasitism does not apply, since the gene's goal is to propogate itself, meaning the relationahip definitely works in favour of the gene attempting to get itself replicated.

D H

Preliminary remarks:
1. Where is Jimmy Snyder? This thread is begging for one of his remarks.
2. If you have one, ask your pregnant wife whether fetuses are parasites. However, do watch out for flying objects and flying retorts when she blames you for ruining her body with your parasite.

Do jokes about 20-something parasites count?