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wasteofo2
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I know sometimes animals in the same genus can breed, and often, if not always, the offspring is infertile. But what is it exactly that draws the line between which species can and can't breed together?
Originally posted by rockind78
My answer to this would be that every organism I can think of relies on a protein-protein, and protein-DNA interactions as a fundamental basis for the sustenance of life.
But yes, as you say there are still differences... OK. I think I understand your point now, and it is something I alluded to in my first post: There are complicated inter-relations between, for instance, surface receptors and its effect on genes. If one species expresses a particular gene in presence of ethanol, it doesn't mean another species wants the same response...so there will be intracellular confusion, leading almost certainly to death.Assuming for a moment that you could get a viable fetus (I have never had developmental or embryology mind you), it would seem to me that you would have all sorts of incompatibilities regarding the aforementioned interactions. Although bye and large, genes and proteins have large areas of homology from organism to organism (we just proved this with furin for example), they are nonetheless, different. Mind you these interactions are extremely specific to that organism. I think tinkering with this would obviously be disasterous.
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...The set of chromosomes of a typical sexually-reproducing organism consists of austosomes, which are common to all members of the species, and the sex chromosomes, which are differently allocated according to the sex of the individual. A diploid nucleus contains two closely similar versions of each chromosome. For each of the autosomal chromosome pairs, one member was initially inherited from the male parent and the other was initially inherited from the female parent. The two versions, which are very similar but not identical in DNA sequence, are called homologs, and in most cells they maintain a completely separate existence as independent chromosomes.
I've been told that cross-species hybridization is much more common in plants than in animals (partly why 'species' isn't so easy to define for plants?); is this one of the reasons why?Originally posted by nautica
In the plant kingdom, a process called polyploidism often takes place, this is an entire duplication of the chromosomes making the zygote a 2n rather than a 1n. This spp can only pair up with another 2n making the offspring a 4n. This 4n is a new spp which can not breed with the parents. So, in this case for certain it is the pairing of chromosomes.
I was thinking about this before and couldn't make up my mind. Are you sure that these problems would arise, because what struck me was that blood type, nutritional requirements etc are all encoded in the DNA: So assuming the chromosomes could somehow pair up consistently, then DNA combination would express everything according to the two scripts it has. This in itself would probably cause problems, but the least of its issues would be its blood type, or how it gets nutrition etc.Originally posted by russ_watters
Even if you do get a zygote to form, there are a host of biological differences that can cause problems: blood type/ph, proteins/enzymes, nutritional requirements, gestation period/requirements.
Inter-species breeding refers to the reproduction between two different species of animals, resulting in offspring that have genetic characteristics from both species.
Inter-species breeding does not always work because different species have different genetic makeups and reproductive systems. This can result in incompatible sperm and eggs, making fertilization and successful development of offspring difficult.
Several factors can affect the success of inter-species breeding, including genetic compatibility, hormonal differences, and physical barriers. Environmental factors such as temperature and nutrition can also play a role.
In some rare cases, inter-species breeding can result in viable offspring that are able to survive and reproduce. However, these cases are typically limited to closely related species with similar genetic makeup and reproductive systems.
The potential consequences of inter-species breeding include the production of infertile offspring, genetic disorders, and negative impacts on the parent species' populations. It can also lead to the disruption of natural ecosystems and the spread of diseases between species.