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ObieX · 02-04-2005, 11:16 AM

Yea allergies are extremely environment dependant. And just because you aren't allergic to something one day doesn't mean that you wont become allergic to it the next. The human body "refreshes" itself about every 7 years, so after some time something that didnt effect you could start to effect you. Like someone could have a cat all their life, but then one day it'll start to make them sneeze and get a runny nose.

Genes are tricky to discuss. Some are dominant (if you have it it will always be the one used, like brown eyes) and some are recessive (you'll need a full set of that type for them to work, like blue eyes) and some work as a team. Height, for example, works with a few sets, if you have more for being tall you'll be tall if you have more for being short you'll be short, if you have a split you'll be medium height.

Parents that both have brown eyes can have a baby with blue eyes. And parents that are both short can have a tall baby (though that one is slightly less likely). With the eyes both parents would have to carry the blue gene, even though they may have this gene for blue eyes they also carry the gene for brown eyes - brown being dominant their eyes would be brown. It's easy to understand but i'l make a little diagram anyway cuz im bored :P

Parent A genes: Bl Br (brown eyed parent)
Parent B genes: Br Bl (brown eyed parent)

Their children could have any of the following combinations:

Bl Br (brown eyed child)
Br Bl (brown eyed child)
Br Br (brown eyed child)
Bl Bl (blue eyed child)

So basically a 1 in 4 chance of a blue eyed child.

However, if only one of the parents has the gene for blue eyes they stand a 0% chance of their child having blue eyes. If one parent is blue eyed and one brown, and the brown eyed person does not carry the blue eyed gene, the children still have a 0% chance to have a blue eyed child. If one parent has blue eyes and one had brown but has the gene for blue their child has a 50% chance to have a blue eyed child.

Anyway, people could have "evolved" traits that would never present themselves as well. If that gene is recessive it may never surface. Rarely is a mutated or evolved gene a dominant gene. A person could evolve the gene for orange eyes, but if that gene is recessive it would never show up if they had the gene for brown eyes. The gene could also be recessive compaired to the blue gene as well. So for this gene to show up the person would have to have a child with a person who also evolved this orange eye gene which would be EXTREMELY rare. And even then the person would only have a 1 in 4 chance of their child having orange eyes which makes it that much more unlikely that it will ever happen.

02-04-2005, 11:16 AM	#61 (permalink)
ObieX Pickles Location: Shirt and Pants (NJ)	Yea allergies are extremely environment dependant. And just because you aren't allergic to something one day doesn't mean that you wont become allergic to it the next. The human body "refreshes" itself about every 7 years, so after some time something that didnt effect you could start to effect you. Like someone could have a cat all their life, but then one day it'll start to make them sneeze and get a runny nose. Genes are tricky to discuss. Some are dominant (if you have it it will always be the one used, like brown eyes) and some are recessive (you'll need a full set of that type for them to work, like blue eyes) and some work as a team. Height, for example, works with a few sets, if you have more for being tall you'll be tall if you have more for being short you'll be short, if you have a split you'll be medium height. Parents that both have brown eyes can have a baby with blue eyes. And parents that are both short can have a tall baby (though that one is slightly less likely). With the eyes both parents would have to carry the blue gene, even though they may have this gene for blue eyes they also carry the gene for brown eyes - brown being dominant their eyes would be brown. It's easy to understand but i'l make a little diagram anyway cuz im bored :P Parent A genes: Bl Br (brown eyed parent) Parent B genes: Br Bl (brown eyed parent) Their children could have any of the following combinations: Bl Br (brown eyed child) Br Bl (brown eyed child) Br Br (brown eyed child) Bl Bl (blue eyed child) So basically a 1 in 4 chance of a blue eyed child. However, if only one of the parents has the gene for blue eyes they stand a 0% chance of their child having blue eyes. If one parent is blue eyed and one brown, and the brown eyed person does not carry the blue eyed gene, the children still have a 0% chance to have a blue eyed child. If one parent has blue eyes and one had brown but has the gene for blue their child has a 50% chance to have a blue eyed child. Anyway, people could have "evolved" traits that would never present themselves as well. If that gene is recessive it may never surface. Rarely is a mutated or evolved gene a dominant gene. A person could evolve the gene for orange eyes, but if that gene is recessive it would never show up if they had the gene for brown eyes. The gene could also be recessive compaired to the blue gene as well. So for this gene to show up the person would have to have a child with a person who also evolved this orange eye gene which would be EXTREMELY rare. And even then the person would only have a 1 in 4 chance of their child having orange eyes which makes it that much more unlikely that it will ever happen. __________________ We Must Dissent.