Spider question

[amcroyals]

This is in direct contradiction to what I was taught when I took genetics in college. That was more than a few years ago, and science is not stagnant, so who knows what has changed. But I'd be really interested in reading more about it. Can you give us the text book or other info we could research?

My thoughts exactly! I would like to know the text book as well!

[amcroyals]

How many of those 4,000 are female vs male spiders? I'm anxious to see the results, but I want it to be 50% male vs 50% female. So, of 4000, 2000 males, and 2000 females. That's the only way to have a more accurate result. I'm sure you know this already, but I was just checking.

Agreed! The results will be innacurate unless the results are from 2000 male spiders and 2000 female spiders!

I find it hard to believe 2000 female spiders were bred to normal males!

[T&C Exotics]

Actually about 1300 were female spiders. As for a book this is not in the book and is straight from the teacher.

[T&C Exotics]

As for a book the teacher is right look at balding in humans. It is carried from the mothers side. My Professor is saying that genetics are more likely to be passed by the mother than by the father. The paper is to prove or disprove that within a small sample group, a single species or a small group of a single species. Sorry that came out wrong in last posting...

[wolfy-hound]

Sounds like a neat paper. My spider male to normal females might skew the grade curve. But if you want the numbers...
Clutch 1: 4 eggs, 4 formed spider babies. 1 died in egg. 3 live hatchlings.
Clutch 2: 3 eggs, 2 molded, 1 formed spider baby - died in egg. No live babys.
Clutch 3: 3 eggs, 1 molded, 2 formed spider babies - both died in egg. No live babies.

[amcroyals]

As for a book the teacher is right look at balding in humans. It is carried from the mothers side. My Professor is saying that genetics are more likely to be passed by the mother than by the father. The paper is to prove or disprove that within a small sample group, a single species or a small group of a single species. Sorry that came out wrong in last posting...

I've heard the balding trait is inherited from the mother's side too.... Kinda funny how genetics work! In my siblings, 2 brothers and a sister, myself and my 2 brothers are loosing our hair.. and balding runs on my father's side not my mom's.. Go figure guess we got screwed on that coin toss

So you have 1300 female spider clutches in your statistics report, that have only been bred by normal males? Wow... Interesting! I have a small collection myself and woudn't dream of using a normal male.... Het. Yes, but normal No... Go figure...

Regards,

[ChadOwens]

I know that there is a 50/50 chance of the genes passing... But how often does that actually happen? I know it is not going to be like that.

I have had clutches from pastel breedings where I got not a single pastel out of 10 eggs but again I have had the exact opposite happen.

With a clutch of 10 eggs using the normal curve approximation the probability of getting 50% spider and 50% normal is about 24%

Method:

Make a box 1's (represents spider) and 0's(represents normal) - draw ten times from this box - the probability of getting exactly five 1's is 24%.

Sd = 1-0 x sqroot (1/2x1/2) = .5
Standard Error = sqroot #draws(10) x sd(.5) = 1.58

Convert to standard units:
(we want the range from 4.5-5.5 under the normal curve)

(4.5-5)/ 1.58 = -.316
(5.5-5)/ 1.58 = .316

The area under the normal curve between -.316 & .316 = about 24%


So, 50/50 split actually occurs 24% of the time (with a 10 egg clutch) - you can adjust the # of draws from the box to calculate different clutch sizes.


Chad

[kc261]

I believe balding is what they call a sex-linked trait, meaning it is carried on the X chromosome. That makes it impossible for men to pass it on to their sons, and also more likely that men will display the trait (they only need 1 gene, not 2). Color-blindness and hemophilia are other examples of this.

Spider in BPs is not a sex-linked trait.

[Egapal]

The paper is for a genetics class where we are learning that in a lot of cases one sex or the other has ,for lack of a better term, stronger genes.

This is just not true. There are some traits that are sex linked and there are some traits that are a result of many different genes. Spider morph is not one of those. It has nothing to do with strength it has to do with the x and y chromosome. Males have and X and a Y and females have two X chromosome. Each chromosome caries genes. If my mom is a carrier for a sex linked trait that means one of her x carries it and the other does not. Now I have a 50, 50 chance of having the trait because I got a y from my father and not an x. My sister has a 0 percent chance of having the trait because she got an x from my father that does not have the gene. The more numbers you collect the closer to 50/50 it will become.

[T&C Exotics]

Ok results are in and I had 1326 clutches that were from female spiders and the total eggs from female spiders were.................................. 7956 that is an average of 6 eggs to a clutch...

I had a lot more males so to make it more fair I took a chart and wrote down all th females and how many eggs laid..... then took and matched things up... So say this chutch had 5 eggs in it froma female spider i found a clutch that had 5 eggs from a male spider.... I did not look at the outcome of each clutch until I had the exact numbers of eggs and clutches done and then I took and added up spiders produced the males and spiders produced by the females....

So who is ready for the results?????????


From male spiders bred to normal females the total number of spiders produced in 1326 clutches of eggs with a total count of 7956 eggs was 3291 spiders................41.36%

From a male normal bred to a female spider the total number of spiders produced in 1326 clutches of eggs with a total count of 7956 eggs was 5264 spiders....................66.16%

So I have concluded that from these results and the data I recieved the spider gene is more dominant in females and is more likely to be passed to offspring than it is from a male...

Thank you all for your help. Now to find out if this is actually true or just the clutches I had for reference so I am going to start a massive spider project.