Originally posted by druidravi
The difference in the dna makeup between man and woman is very little.So I suppose when the female mutuate developed breasts it was passed onto male offspring too.But since only a female body bears children thus knowing when to produce milk breasts were developed in females and remained non-functional in male.
Am I correct in asuming that nipples would develop prior to differentiation into sexes in a fetus , or could it develop even after a male sex has been determined. (any idea if there's been research done ?) . Next question, are there any examples of other female only characteristics in male mammals or in other species ?
Last question. If (for example) nipples were more developed sweat glands, is there any reason to assume it would not remain beneficial in males mammals ? I realise the mother would spend more time with the offspring, however there are many cases in primates forinstance where males spend an equal amount of time rearing the young.
]originally posted by pcaspianI know lots and lots of scientists that can give you an explaination. I won't tell you who there are or where you can go to find them. I leave that exercise to you. You know all that junk about spoon-feeding and not having time to do research for you blah blah blah.
Merely a question Rwing. If we don't ask questing, we don't learn 🙂
I suggest you try the "pcaspian method."
1) make a list of all the well-known unbiased biologists
2) do a google search to find out what there views are on how mammals got nipples.
3) Good luck!
😉
Originally posted by RBHILLSorry to burst your bubble RB but you can forget that particular bit of holy providence . 🙂
Now you know Humans where put here by God.
We are 93 million miles from the sun. if we where 92 million we would burn up and if we where 94 we would freeze. So we where not put here by chance.
The sun's orbit is elliptical. At closest approach (perihelion) in January, the earth is about 91.6 million miles from the sun. At its furthest away in July (at aphelion) it is about 94.8 million miles from the sun.
Strangely the climate is warmer in in July than January when we are nearer the sun!!!! 😲
Of course, its the opposite for Southern Hemispherians.
It is the earth's 23.5 degree tilt that gives us the warmer/cooler seasons. The varying distance from the sun has little effect on temperature in comparison.
I think we are here by chance. Fortunately, science makes the universe knowable without the need for divine intervention, whether its men's nipples or astronomy you're interested in. 🙂
Cheers.
SB
Originally posted by telerion
1) make a list of all the well-known unbiased biologists
2) do a google search to find out what there views are on how mammals got nipples.
3) Good luck!
😉
LOL, sour grapes Tele ? I've done a search on google, but that came up pretty fruitless. So far all I've found is the Platupus that secretes milk from hairs, but not too much else. Hehe, atleast SOME direction would be usefull 🙂
Originally posted by pcaspianNah, not really. Always fun when the shoe is on the other foot. 🙂
Originally posted by telerion
[b]
1) make a list of all the well-known unbiased biologists
2) do a google search to find out what there views are on how mammals got nipples.
3) Good luck!
😉
LOL, sour grapes Tele ? I've done a search on google, but that came up pretty fruitless. So far all I've found is the Platupus that secretes milk from hairs, but not too much else. Hehe, atleast SOME direction would be usefull 🙂
[/b]
Anyway, I did a bit of looking around googling using the search "origin mammals."
Bingo! Lots of hits.
Some were biology class websites specifically on the issue.
Here's the first one that came up of that nature.
http://biology.fullerton.edu/courses/biol_404/web/hol/hol_ch15.html
It had some useful links and some guides to further study about mammals.
Try using the same parameters. It shouldn't take but a few minutes to get some good stuff.
Originally posted by telerion
Try using the same parameters. It shouldn't take but a few minutes to get some good stuff.
Hehe thanks for the link, will read in detail tomorrow.. so far I only found the following section at that link specifically dealing with the actual evolution :
"The mammary gland is a skin gland
A major characteristic of mammals is the adaptation of skin glands, such as hair follicles and mammary glands. The origin of mammary glands is unknown. A gland is a secreting organ. "
Alas... anyway, was an article about breast feeding in the N.S last week, but more to do with energy consumption from breast feeding vs energy consuption from grinding food up, but no mention of actuall gland evolution.
cheers
Originally posted by royalchickennot really. As stated before, the reason males have nipples is that they are developed in the foetus before the surge of hormones dictates that the foetus will grow to be male. The fact that males are more likely to have a superfluous 3rd nipple (as opposed to the other 2 multifunctional ones) is likely a different matter altogether. Mlaes have the XY chromosome as opposed to the female XX. These chromaosome pairs compliment each other with the strongest genes from each dictating our characteristics. In males we ware missing a bit on the Y chromasome (making it a Y shape instead of the X shape) meaning that there is no comprtition to that section on the matching X chromasome. Therefore we are much more likely to have minor defects that are controlled by this part of the chromasomne than women, such as male patern baldness. Although I have never seen this relate to 3rd nipples its possible the explanation why men have them more often than women, and even if it's not the reason it shows that there are explanations that don't cause the theories of why men have nipples to be any less valid.
One of the cleverest people I've ever met told me that one man in five has three nipples, while the proportion is lower in females 😛.
Actually, if this is true, it has implications about the validity of the earlier explanation of nipples on males.
Originally posted by pcaspianI have no idea where you found that particular bit of misinformation, but the platypus does NOT secrete milk "from hairs". The milk is secreted from glands in the skin and the young of the platypus then lick or suck it off the overlying hair.
So far all I've found is the Platupus that secretes milk from hairs, but not too much else. Hehe, atleast SOME direction would be usefull 🙂[/b]
Actually, Acolyte was basically on the right track and the monotremes (platypus and echidna), as the most primitive of living mammals, provide evidence for this. As an offshoot branch of mammals from before nipples evolved, they exhibit how the milk got to the babies without nipples.
Best Regards,
Paul
Originally posted by belgianfreakThat makes sense.
not really. As stated before, the reason males have nipples is that they are developed in the foetus before the surge of hormones dictates that the foetus will grow to be male. The fact that males are more likely to have a superfluous 3rd nipple (as opposed to the other 2 multifunctional ones) is likely a different matter altogether. Mlaes have the XY c ...[text shortened]... re are explanations that don't cause the theories of why men have nipples to be any less valid.
Originally posted by prnDo you think there is rhyme and reason behind all evolutionary
I have no idea where you found that particular bit of misinformation, but the platypus does [b]NOT secrete milk "from hairs". The milk is secreted from glands in the skin and the young of the platypus then lick or suck it off the overlying hair.
Actually, Acolyte was basically on the right track and the monotremes (platypus and echidna), as the most pri ...[text shortened]... s evolved, they exhibit how the milk got to the babies without nipples.
Best Regards,
Paul
[/b]
change, such as acquiring the ability to milk one's young? Do
you think there was no reason it happened that way, it just
happened luckily? This of course assumes you believe in the
evolutionary change theory. For those that do not, the changes
being described didn't happen either with or without design or
purpose behind them.
Kelly