penis size and genetics

is penis size effected by genes, or is it a kind of random thing?

like lets say some guy has a 12" dong, does his offspring have a higher chance to have a bigger one?

i ask this because i read that penis size is usually a result on someones mother.. but i have a hard time believing that with my basic knowledge of genes, etc.

 

almost everything in our body has something to do with genetics so I don't think penis size is an exception! I don't think they found the exact genes for it though.

 

the good old nature vs. nurture debate. Its genetics in combination with hormone levels, diet, chemical exposure (which can affect hormone levels), as well as environmental exposure in the womb. Your genes come from both your parents.

 

We know that men can contribute to their daughters vaginal size as well as breast size since he contributes the other X chromosome.

There are 2 influences of penis size:

1. how many cells that you are born with
2. the rate and concentration of exposure to male hormones

With that being said the boy can be born with enough penis cells that will mature to a 6" penis at full maturity if everything else is constant like nominal hormone levels.

However, if the mother's side pumps out more than average amounts of hormones that will increase the size of the penis to 7", for instance.

 

link to journals?

 

do you believe that a guys chances of going bald link back through their mother? or does your basic knowledge of genes tell you otherwise?

 

"link back through"

 

Well...not all; mitochondrial DNA is strictly from your mother...but I'm just nitpicking

 

touche. yes, i failed to mention miDNA, my bad

 

it depends on what the dominate gene of the person is

if the womans grandfather had a dominate gene for baldness and so did the father of the child, yes i do believe the has a potential of going bald

 

Please don't anyone think this post contains any amount of fact.

Sorry, you're not born with any penis cells. You basically start as a blob of undifferentiated cells, as your shit progresses, your cells begin to differentiate into specific functional roles.

As far as genes go, its not black and white. Some things, such as hair on your knuckles, attachment of your ear lobe (some people have a hangy flap, some don't) are directly related to your father's genes. If he had it, you have it, vice versa. The vast majority of human characteristics are not that simple. Its one giant gray area. You can be predisposed genetically, but you may or may not display specific traits. These discrepencies can be attributed to environmental factors, or just plain random chance (random as far as we know at this point).

What genes are passed on generation to generation also has alot to do with where the gene is physically located on each chromosome. Recombination, crossing over, etc. all plays a part. If your father has a gene on his X chromosome, you're not going to inherit it (talking about guys here). You get your X from your mom, Y from your dad.

Its not nearly as simple as saying some traits are dominant, others recessive, and if we know your family history we can use punnet squares to figure out the chances that your kids will have specific traits. Would be interesting if that were the case though

If you're really interested, pick up a genetics book and try reading it. I dunno of anything thats written simply enough for most people to understand without taking classes on the subject though. Worth a shot if you really want to try and understand the way shit works.

P.S. i've been giving alot of medical advice around here lately. For those curious i'm a medical intern in nuclear medicine. I'm not a reproductive specialist, i'm just trying to share some of my knowlege i've picked up over years of pre-med and med courses. I'm no expert.

 

it's not maternal grandfather.

like everything else, genes for baldness come from your mom and your dad. the maternal grandmother's genes are just as important as the maternal grandfather's, which are just as important as the paternal grandparents' genes.

 

thank you very much! I just chose to ignore his post all together rather than type up a full-fledged response, but I'm actually a genetics tutor at my college. Not saying I'm an expert or anything, either, but at least i've taken a course.

 

actually, its very largely the maternal line. many genes for male pattern baldness are on the X chromosome, which men inherit from their mothers. there are forms of baldness that fall outside of this pattern, and other genes are also involved, but that accounts for a large portion of baldness. this is also why many inherited diseases that are X-linked occur more often in males than females.

 

Haha yeah, i don't understand the half of it. Its kind of cool though, between some of the genetics classes i've taken, new editions and revisions of the textbooks have come out that have completely reversed some of the previous ways of teaching genetics. That shit is progressing so damn fast its incredible. Compare what we know now to even say, the year 2000, and its insane whats changed.

 

so then why would those genes be coming from the mother's father moreso than the mother's mother?

 

Because the mothers mother has two copies of the X chromo, so has a chance of passing on a functioning X even if the other is abnormal, doesn't matter if she displays the traits or not. The mothers father only has one X, and if he's displaying the abnormal traits from that X, or even carrying them on the X, he's definitely passing those traits along to a daughter. So, basically equal chances of expression between the mother and father, only that the mother has the extra chance of passing along a normal X. Fawk i hate genetics.

For things that are said to be passed maternally and affect guys, they're probably referring to genes that are X-linked. Because a father that has a son, is only passing along his Y, there is no way he can affect the son's genes that are x-linked, it all has to come from the mother. The male line can only express those traits, but can never directly pass them along to a son. He could however have a daughter who carries the traits, who then has a son who can display those traits. This is why some shit is said to "skip" a generation. Random chance is still involved in all of it.

 

interesting

 

i thought most things skipped a generation?

for instance if you cross red plans with white ones, the offspring will be either red or white, and when those offspring have offspring they will be multi colored, or pink, etc.

i dont know, i never really "got" genetics, its a bunch of confusing alleles and genes and crap

 

most things dont "skip a generation" its just a function of the gene. If its a dominant trait, its likely to show up in every generation (for example, Huntington's disease). If its a recessive trait, it can hide through the generations and then randomly show up finally, because its been carried through the generations in individuals with one defective gene and one functional gene. This is how sickle cell anemia works.

When you have red plants crossed with white ones, and red is dominant to white, you will have all red plants in the first offspring generation. When you inbreed those offspring, you will theoretically get one red plant, two pink, and one white, where the pink are the plants that have one red allele and one white allele. This is an example of incomplete dominance. If the two pink plants were instead red with white spots, it would be codominance. And if the offspring were three red to one white, that's and example of complete dominance.

Its all rather complicated and difficult to explain in simple terms. I've explained dominant/recessive traits to my mother about 45,000 times, along with the factor of penetrance (just because your genes code for a disease doesn't 100% guarantee you will have it) and she just cannot grasp it. She has a recessive disease with a penetrance below 50%, and she lost the genetic lottery.

 

If any of you are honestly interested in learning about genetics, just pick up an undergraduate level genetics textbook. Everything should be defined in there, so even if you're a noob in terms of biology you should be able to understand it with some work.

Here's the genetics textbook I used a couple years back, and it does a great job in explaining concepts.

http://www.amazon.com/Essential-Gen...bs_sr_1?ie=UTF8&s=books&qid=1226543429&sr=8-1

 

yes.

pseudo-science? I think not.

 

It's ok, you'll notice he tends to brag.

 

It must be all the Enzyte you take

 

yes like im going to ask my father to look at his penis to compare it to mine

and i noticed someone edited my thread title