Heredity B/Designer Genes C

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MacBookMinus
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Re: Heredity B/Designer Genes C

Postby MacBookMinus » April 24th, 2013, 4:49 pm

Anybody in Division B think that we need to know about PCR, or that one thing I've seen in Div. C tests where you use lines to figure out who the father was? Sorry for being really unspecific I can't put it into words.
Last edited by MacBookMinus on April 24th, 2013, 4:54 pm, edited 1 time in total.
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Re: Heredity B/Designer Genes C

Postby MacBookMinus » April 24th, 2013, 4:50 pm

How do you become a mod?

Edit: it's ridiculous how tech impaired I am. I edited my post like 6 times before I got it right.
Confucius say "man who run in front of car get tired, but man who run behind car get exhausted."

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Re: Heredity B/Designer Genes C

Postby mnstrviola » April 24th, 2013, 9:12 pm

Someone help me with Baye's theorem for conditional probabilities?

So according to my packet, the equation is P(B|A) = P(A and B)/P(A).

Suppose a woman is carrying one X chromosome with the gene for a particular type of colorblindness. She marries a man who does not have this gene on his X chromosome. What is the probability that her first child will carry the X chromosome with the gene associated with color blindness?

I'm not sure how to take that information and put it into the equation. :/
I think this means

The probability of A given B = The probability of both occuring, divided by the probability of A
which means
The probability of A, assuming B is correct = The probability of both A and B happening, divided by the probability of A happening

I'm not sure how it fits for your problem, but I can give it a shot
P(B|A) = P(A and B)/P(A).
B= child inherits the colorblindness gene from her parents
A= given her carrier mom marries a healthy dad

This may not be the right setup, but you can reason it out without using that probability thing.
If the child is male, he has a 50% chance of inheriting the X chromosome with colorblindness. His dad's chromosome doesn't really matter.
If the child is female, she has a 50% chance of inheriting the X chromosome with colorblindness. Her dad's chromosome doesn't really matter.
(.5*.5)+(.5*.5)=.5
There is a 50% chance the child will inherit the gene for colorblindness.

Hopefully this is what you're looking for :)

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Re: Heredity B/Designer Genes C

Postby honeybunchesofoats » April 27th, 2013, 8:32 am

Thanks ^^ I still don't understand it, but I guess I could just reason it out then (:

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Re: Heredity B/Designer Genes C

Postby Beastybob12345 » April 29th, 2013, 10:42 am

Hi guys, I'm thinking about doing Heredity for next year. What do you do in it? And is it difficult?

Thanks :D
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Re: Heredity B/Designer Genes C

Postby ScienceOlympian » April 30th, 2013, 8:13 pm

Hi guys, I'm thinking about doing Heredity for next year. What do you do in it? And is it difficult?

Thanks :D
It is a lot of probability, and genetic disorder. And enzymes! DNA Polymerase!!!
Like all events, Heredity can be difficult. Start out with the easy topics. Then learn to do Dihybrid crosses, then Trihybrid. Learn about blood types. I recommend doing a practice test that has a baby question: Three babies were mixed up in the hospital and they need to get to their real parents! Then do a blood type Punnett square.
Heredity is very fun!
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Re: Heredity B/Designer Genes C

Postby Beastybob12345 » May 1st, 2013, 8:27 am

Hi guys, I'm thinking about doing Heredity for next year. What do you do in it? And is it difficult?

Thanks :D
It is a lot of probability, and genetic disorder. And enzymes! DNA Polymerase!!!
Like all events, Heredity can be difficult. Start out with the easy topics. Then learn to do Dihybrid crosses, then Trihybrid. Learn about blood types. I recommend doing a practice test that has a baby question: Three babies were mixed up in the hospital and they need to get to their real parents! Then do a blood type Punnett square.
Heredity is very fun!
Sounds complicated but fun!! :D
And we're learning it in 7th grade aren't we? That would be good for me. :D
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Me----> Image

NorCal Science Olympiad is AWESOME!!!

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Re: Heredity B/Designer Genes C

Postby ScienceOlympian » May 1st, 2013, 5:25 pm

Hi guys, I'm thinking about doing Heredity for next year. What do you do in it? And is it difficult?

Thanks :D
It is a lot of probability, and genetic disorder. And enzymes! DNA Polymerase!!!
Like all events, Heredity can be difficult. Start out with the easy topics. Then learn to do Dihybrid crosses, then Trihybrid. Learn about blood types. I recommend doing a practice test that has a baby question: Three babies were mixed up in the hospital and they need to get to their real parents! Then do a blood type Punnett square.
Heredity is very fun!
Sounds complicated but fun!! :D
And we're learning it in 7th grade aren't we? That would be good for me. :D
Yep but it is basic. The most complicated thing i learned was Dihybrid crosses, and we only did one Dihybrid cross. You would have to practice, practice, practice it! Take some Designer Genes tests from the Test Exchange. And karyotypes, pedigrees are important.
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Re: Heredity B/Designer Genes C

Postby PicturePerfect » May 2nd, 2013, 5:41 pm

@BeastyBob:
Heredity is probably my favorite event. Some questions are harder than others, but it's really fun. And yes, 7th grade Life Science does teach Heredity :)
2012-2013 Event Name | Best Finish |
Heredity | 2nd
Forestry | 3rd
Food Science | 5th
Team | 1st

2013-2014 Event Name | Best Finish |
Heredity | 4th
Water Quality | 7th
Shock Value | 7th
Wheeled Vehicle | 7th

2014-2015 Event Name | Best Finish |

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Re: Heredity B/Designer Genes C

Postby ScienceOlympian » May 2nd, 2013, 6:20 pm

@BeastyBob:
Heredity is probably my favorite event. Some questions are harder than others, but it's really fun. And yes, 7th grade Life Science does teach Heredity :)
@PicturePerfect
My favorite event is a close tie between Shock Value and Heredity, so it is technically my favorite event. So me too!
@Beastybob12345
I barely studied for my Regionals test for Heredity, since I already had a unit on Heredity in Science, but the test was extremely hard... Even harder than the State Test. But I managed to get 3rd, mysteriously. So don't rely on your Science class TOO much.
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