Talk:Heterosis

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Regarding the addition of 'some stinky dogs'

I don't know how many of the uninitiated would understand the reference to heterotic string; I'm guessing it wouldn't be many. However, the words "hybrid vigour" incite passionate debate in the various animal fancy groups. "Heterosis" just happens to be the proper term for this phenomenon. I'm sure no disrespect was meant to string theory, but believe me it's more than just a question of a few stinking dogs, or cats, or horses, or cows, or....Thanks for the chuckle! Quill 04:30, 3 Apr 2005 (UTC)

Importance/expansion

Personally I think the concept of heterosis is extremely important from a biological and evolutionary point of view- I'd love to see someone expand this with some hard science, casting a bigger net than is cast now. Kharhaz

Outbreeding depression

"It may also happen that a hybrid inherits such different traits from their parents that make them unfit for survival. This is known as outbreeding depression, typical examples of which are crosses between wild and hatchery fish that have incompatible adaptations."

It should be clarified that:

a) Outbreeding depression only occurs between populations that have diverged significantly i.e. Different species.

b) There are two kinds of outbreeding depression. One, because the hybrid isn't equally adapted to the parental environment. The other because of the breaking down of co-adapted gene complexes, especially in F2, F3 generations (e.g Bos Taurus x Bos Indicus). - Unsigned

//

A is not necessarily true: small numbers of gene differences cause express this, an obvious example being skin colour in humans who are all very closely related. This example also highlights the necessity of context in applications of "fitness": A dark skinned person is more fit in a sunnier location than a cloudier location in comparison to a light skinned person, and a "cross" of the two will be less fit in either parents location (in that specific instance), but more fit in an enviroment in between the two. Even this depends on other genetic factors such as vit-d biosynthesis ability. I think it is extremely important to reiterate the contextual nature of "fitness" whenever an example is given for these reasons, it is not easily possible to talk of "absolute fitness": eg. sterile mules are completely unfit, yet also heterotic for human wants. --84.71.35.39 (talk) 13:24, 24 October 2024 (UTC)[reply]

Overdominance

Are the effects described by the OD theory not applicable to all forms of incomplete dominance, eg. co-dominance and so on? rather than just overdominance? as the literature refers to it as OD we should continue that here but it seems almost a misinterpretation by the literature 84.71.35.39 (talk) 13:57, 24 October 2024 (UTC)[reply]