Don't be stupid.......even your stumpy little legs would drag along the ground on a 2 foot tall horse, and how the fck are you supposed to mount a 25 foot tall one? 
Unmasking evolution
- Thread starter gasbanni
- Start date
Sponsored Links
J
joinerjohn
Why would anyone want to breed a horse 25ft tall ? Just to show it could be done?
Anyway, about dogs, dogs can interbreed (if allowed to) That's where we get Labradoodles from. Differing dog breeds are not the result of natural selection at work, but the result of hundreds of years of selective breeding by man. Because dogs reach maturity fairly quickly (compared to humans) selective breeding produces faster results. If you wanted to start from scratch and breed say a Collie with very large ears, you'd mate the male with the biggest ears, with the female with the biggest ears, and keep on doing this with successive generations. A hundred or so years down the line, you'd have a Collie with ears a bloodhound would envy. Simple genetics at work Joe, nothing to do with nature.
Given a long enough timespan, humans could selectively breed and create either an extremely tall human, or a very short human, a human with large ears, or perhaps a human almost without ears. The real question is why would we want to do such a thing?
- Joined
- 28 Oct 2005
- Messages
- 31,281
- Reaction score
- 1,997
- Country
There's nothing simple about it at all. No-one has ever discovered why you can have hundreds of breeds of totally different dogs - but not with sheep, cows, mice etc. It's a well known mystery of the world and no-one knows why that is.
Sponsored Links
J
joinerjohn
Hmmm
http://en.wikipedia.org/wiki/List_of_cattle_breeds
http://en.wikipedia.org/wiki/Sheep_breeds
http://www.thefunmouse.com/varieties/list.cfm
Hmmmmmmm not very bright tonight are we Joe.
- Joined
- 28 Oct 2005
- Messages
- 31,281
- Reaction score
- 1,997
- Country
But they are almost all identical in size and shape. Now do the same for dogs.
http://www.infodogs.co.uk/dog-breeds/
http://www.infodogs.co.uk/dog-breeds/
J
joinerjohn
You just ain't clicked the links have you Joe. Dexter cattle are very small and you surely can't tell me Highland cattle look anything like a Fresian, or a Fresian looks the same as a Holstein or Hereford.
You can't see that by selectively breeding certain traits into breeds of dog, man has himself created the breeds. Desirable traits have been bred into these animals over a long period of time. Have a look at differing breeds and see why they have been bred the way they have. Each breed is the result of mans influence and is therefore a designer breed, only here because of man's ingenuity.
We could probably do exactly the same with any other type of animal (given a long enough period of time)
No point in arguing with a fruit cake with his fingers in his ears.
Breeding dogs/cats/sheep/horses etc is a lot to do with Mendelian inheritance and very little if anything to do with evolution.
You could do the same with humans, in fact tall people probably selectively breed with tall people and the result is taller people than the average. But you always have to remember that these things also regress to the mean. So a lot of dogs will have to be destroyed to maintain that 'perfect breed'
Breeding dogs/cats/sheep/horses etc is a lot to do with Mendelian inheritance and very little if anything to do with evolution.
You could do the same with humans, in fact tall people probably selectively breed with tall people and the result is taller people than the average. But you always have to remember that these things also regress to the mean. So a lot of dogs will have to be destroyed to maintain that 'perfect breed'
- Joined
- 28 Oct 2005
- Messages
- 31,281
- Reaction score
- 1,997
- Country
When the argument is lost - the abuse begins.
You obviously know little about science or you would be aware that the ability of dogs to produce huge numbers of varieties is a well known scientific conundrum, that as yet, has no answer.
You obviously know little about science or you would be aware that the ability of dogs to produce huge numbers of varieties is a well known scientific conundrum, that as yet, has no answer.
J
joinerjohn
There's nowt as blind as them that won't see.
You shouldn't talk about the heir to the throne in those terms.
J
joinerjohn
Hmmmm let's see, If I bred my Border Collie, with a female Border Collie,,, What sort of pups do you think would result? (there's a clue there somewhere if you can see it Joe)
(This is why breeders are careful to only breed like with like)
Not entirely true:
"Abstract
Background
A selective sweep containing the insulin-like growth factor 1 (IGF1) gene is associated with size variation in domestic dogs. Intron 2 of IGF1 contains a SINE element and single nucleotide polymorphism (SNP) found in all small dog breeds that is almost entirely absent from large breeds. In this study, we surveyed a large sample of grey wolf populations to better understand the ancestral pattern of variation at IGF1 with a particular focus on the distribution of the small dog haplotype and its relationship to the origin of the dog.
Results
We present DNA sequence data that confirms the absence of the derived small SNP allele in the intron 2 region of IGF1 in a large sample of grey wolves and further establishes the absence of a small dog associated SINE element in all wild canids and most large dog breeds. Grey wolf haplotypes from the Middle East have higher nucleotide diversity suggesting an origin there. Additionally, PCA and phylogenetic analyses suggests a closer kinship of the small domestic dog IGF1 haplotype with those from Middle Eastern grey wolves.
Conclusions
The absence of both the SINE element and SNP allele in grey wolves suggests that the mutation for small body size post-dates the domestication of dogs. However, because all small dogs possess these diagnostic mutations, the mutations likely arose early in the history of domestic dogs. Our results show that the small dog haplotype is closely related to those in Middle Eastern wolves and is consistent with an ancient origin of the small dog haplotype there. Thus, in concordance with past archeological studies, our molecular analysis is consistent with the early evolution of small size in dogs from the Middle East. "
http://www.biomedcentral.com/1741-7007/8/16/abstract
Wrong.
If sufficiently closely related spiders breed, you can get hybrid spiders:
"Identification of Tegenaria gigantea and T. saeva.
Over much of central and southern England and Wales, these species are readily separated.The difficulty comes in the regions where the species distributions overlap because here they can hybridise and first generation hybrids may backcross to the parental species producing a graded series of intermediates."
http://srs.britishspiders.org.uk/resource/Tegenaria gigantea and saeva.pdf
If they are further apart (relation wise), I understand one gets a "mule" spider (sterile). Further apart still, and they won't be able to breed (even artificially). However, differing mating rituals tend to be a problem as well.
There are over 40,000 species of spider, but 110 families
Sponsored Links
