|
Register | Sign In |
|
QuickSearch
EvC Forum active members: 65 (9164 total) |
| |
ChatGPT | |
Total: 916,908 Year: 4,165/9,624 Month: 1,036/974 Week: 363/286 Day: 6/13 Hour: 1/2 |
Thread ▼ Details |
|
Thread Info
|
|
|
Author | Topic: Evolution Simplified | |||||||||||||||||||||||
kuresu Member (Idle past 2543 days) Posts: 2544 From: boulder, colorado Joined: |
Unless for some reason all the offspring were born homozygous dominant in the example we've been using, the answer is yes.
|
|||||||||||||||||||||||
kuresu Member (Idle past 2543 days) Posts: 2544 From: boulder, colorado Joined: |
any mutations that have evolutionary significance occur during conception conception, if I remeber correclty, is the process of sperm and egg meeting and combining their genetic material. mutations do happen here, but EZscience wasn't talking about those. However, these mutations do have "evolutionary significance". you may have misunderstood EZscience when he said:
the odds are that we all carry a number of mutations that occurred during the formation of the gametes that gave rise to us when they formed a zygote he mentioned the mutations that happen during gametic formation. These are the ones that happen while you body is making sperm or eggs (depending on your sex). The mutations from this process are the ones passed on, because gametes, not body cells, are used to form zygotes. These, then, have "evolutionary significance". Keep in mind, if something is capable of budding (like hydra), or growing from clippings (like many plants) this isn't always the case.
|
|||||||||||||||||||||||
EZscience Member (Idle past 5183 days) Posts: 961 From: A wheatfield in Kansas Joined: |
They (AbE *heritable* mutations) can occur at any time in the development of a germ cell line(the cells giving rise to sperm and eggs), but they are most likely to occur during a cell division because this is when all the genes are copied. Any other type of mutation is termed a 'somatic' mutation and is not heritable (as kuresu correctly notes).
This message has been edited by EZscience, 05-12-2006 03:41 PM
|
|||||||||||||||||||||||
robinrohan Inactive Member |
These are the ones that happen while you body is making sperm or eggs (depending on your sex). OK, I got it now. You're right; I didn't understand what EZscience was saying. It's confusing. There seem to be so many different types of mutation. This message has been edited by robinrohan, 05-12-2006 04:01 PM
|
|||||||||||||||||||||||
robinrohan Inactive Member |
Unless for some reason all the offspring were born homozygous dominant in the example we've been using, the answer is yes. OK, then it's not an absolute. It's possible, though perhaps unlikely, that a positive trait would appear and not be passed down. So what you need is not only this appearance of a positive trait but also that individual has to mate with the right partner. Otherwise evolution will not occur.
|
|||||||||||||||||||||||
kuresu Member (Idle past 2543 days) Posts: 2544 From: boulder, colorado Joined: |
you may be taking my comment a bit out of context, or something like that. We have assumed that blue eyes are reccesive in the example. in order for it to be expressed, the person must be "bb". However, it could be that the person is "Bb", in which case he still carries the gene. a right partner isn't needed, unless you mean someone of the opposite sex in your species (for mating, sexes are required). The person carrying the gene just has to mate in order to pass it down, barring the unlikely scenario that you quoted that I gave.
|
|||||||||||||||||||||||
robinrohan Inactive Member |
The person carrying the gene just has to mate in order to pass it down, barring the unlikely scenario that you quoted that I gave. Just the fact that the unlikely scenario is possible means the process is not absolute. However unlikely, it might not happen.
|
|||||||||||||||||||||||
kuresu Member (Idle past 2543 days) Posts: 2544 From: boulder, colorado Joined: |
I think my post was more to dispel the need for the "right partner" in order to pass on the gene. That wasn't quite clear in my last post.
let me try again. the right partner is not needed in order to pass on the gene, that person just has to mate.
|
|||||||||||||||||||||||
robinrohan Inactive Member |
the right partner is not needed in order to pass on the gene, that person just has to mate. OK, so being born homozygous dominant has nothing to do with the parents.
|
|||||||||||||||||||||||
kuresu Member (Idle past 2543 days) Posts: 2544 From: boulder, colorado Joined: |
it has everything to do with the parents. my objection was when you said that in order to pass on the gene the person with it needed to mate with the "right person". Which is why I said that the person carrying the blue eye gene just needed to mate in order to pass it on.
|
|||||||||||||||||||||||
robinrohan Inactive Member |
it has everything to do with the parents. my objection was when you said that in order to pass on the gene the person with it needed to mate with the "right person". OK, I must be confused about who's being born homozygous dominant. I thought you meant the offspring of the one with the positive trait.
|
|||||||||||||||||||||||
kuresu Member (Idle past 2543 days) Posts: 2544 From: boulder, colorado Joined: |
not only this appearance of a positive trait but also that individual has to mate with the right partner you and I seem to be misunderstanding each other, and the post I'm replying to is where it's starts, I think. in the quote, do you mean by appearance the phenotypical expression of the gene? phenotype is the physical characteristics of the organism. Genotype is the genetic characteristics of the organism. genotype controls phenotype.
|
|||||||||||||||||||||||
robinrohan Inactive Member |
in the quote, do you mean by appearance the phenotypical expression of the gene? phenotype is the physical characteristics of the organism. Genotype is the genetic characteristics of the organism. genotype controls phenotype. I have that terminology down. But something can be passed on either recessively or dominantly. Just because it's recessive, it doesn't mean it can't appear later. I thought you were saying that there was one unlikely scenario in which the positive trait would not be passed down at all. Come to think of it though, if it doesn't appear in the phenotype (if it's recessive), it wouldn't affect survival rate, I would assume.
|
|||||||||||||||||||||||
kuresu Member (Idle past 2543 days) Posts: 2544 From: boulder, colorado Joined: |
i was. it's a highly unlikely event when the single gene is considered. If two are considered, such as eye color and skin color, and if they are linked or not linked, that event becomes more likely, but I don't know how to do linked gene crosses.
it woulnd't affect survival rate, but it could still be passed down, and that increases the chance of two heterozygotes in a population mating. Then there would be a homozygous recessive. Taking the example differently. If the blue eye was dominant over brown eye, then you end up with the trait being passed down much more easily. And not all mutations are not recessive, so . . .
|
|||||||||||||||||||||||
robinrohan Inactive Member |
i was OK, but just to clear this up, it doesn't have anything to do with the partner? It's just about the genetic make-up of the individual with the positive trait?
|
|
|
Do Nothing Button
Copyright 2001-2023 by EvC Forum, All Rights Reserved
Version 4.2
Innovative software from Qwixotic © 2024