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GasparLewis
Unfettered
Joined: 19 Nov 2005 Posts: 474 Location: vicinty of NYC
[SOLVED] #178- Sex Linked The text:
Colour blindness affects a significant minority of people in the world, and is caused by a sex linked genetic disorder. Can you answer these questions about how colour blindness is inherited?
*diagram*
1. On which chromosome does this genetic mutation reside?
2. What is the probability of A being a female carrier of colour blindness?
3. What is B's genotype?
The picture:
No back; sorry.
The answer (approximately; not sure about wording):
Spoiler (Rollover to View):
X, 1/4, heterogeneous [female]/Cc
Pretty sure, anyway; thank you, Bio class.
And I don't even own the card.
ZING!
Posted: Fri Nov 25, 2005 1:15 am
European Chris
Unfictologist
Joined: 19 Jul 2005 Posts: 1264 Location: London's trendy Whitechapel
[Spec] This is the second card about colour blindness-possible that it could relate to the story arc?[/spec]
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Posted: Fri Nov 25, 2005 4:50 am
Wowbagger
Boot
Joined: 22 Aug 2005 Posts: 69 Location: Leafy Surrey, UK
Looks like a good solve - although one small point if I may, the term you are looking for is
Spoiler (Rollover to View):
heterozygous
But whether it is relevant to how the answer is typed in, I don't know.
Posted: Fri Nov 25, 2005 7:45 am
lillyplop
Boot
Joined: 17 Oct 2005 Posts: 52
Options you are given on the answer page are:
1. Which Chromosome
2. Probability of being a female carrier
3. What is B's genotype xx, xcx, xcxc
Posted: Fri Nov 25, 2005 5:07 pm
Atrophied
Entrenched
Joined: 29 Aug 2004 Posts: 1133 Location: 53742E 4A6F686E27732C 4E4C00
lillyplop wrote:
Options you are given on the answer page are:
1. Which Chromosome
2. Probability of being a female carrier
3. What is B's genotype xx, xcx, xcxc
So the answers are, respectively (as per the above post):
Spoiler (Rollover to View):
1 - X Chromasome
2 - 1 in 4 // 1/4 // 0.25 // 1:4 (whichever you prefer)
3 - XCXc
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Posted: Fri Nov 25, 2005 6:56 pm
GasparLewis
Unfettered
Joined: 19 Nov 2005 Posts: 474 Location: vicinty of NYC
So, everybody pretty much agrees, then.
Just about accepted phrasing now, I guess.
And for being the second color blindness card? Maybe a relation, but color blindness is generally a safe, easy example for sex-linked disorders . Wouldn't into it too much, but then again, you never know.
Edit: Bloody nitpickers, the lot of you...
And, now that we know the exact phrasings, this is a real SOLVED.
Posted: Sat Nov 26, 2005 10:33 pm
Last edited by GasparLewis on Tue Nov 29, 2005 12:42 am; edited 1 time in total
Atrophied
Entrenched
Joined: 29 Aug 2004 Posts: 1133 Location: 53742E 4A6F686E27732C 4E4C00
GasparLewis wrote:
And for being the second color blindness card? Maybe a relation, but color blindness is generally a safe, easy example for sex-linked diseases.
Since when is colour-blindness a disease? Yes, it's a genetic disorder, but it's most certainly not a disease.
Poor choice of words on your part, methinks.
Sorry, but knowing a fair number of colour-blind people, many in my own family, I took offense to that.
~Atrophied
_________________"It will be happened; it shall be going to happening; it will be was an event that could will have been taken place in the future." -- Time travel, as explained by Arnold J. Rimmer
"The Future's bright, the Future's Cuboid" - Juxta
Posted: Sun Nov 27, 2005 3:45 pm
locqust
Unfettered
Joined: 14 Oct 2005 Posts: 545 Location: Gloucestershire UK
Just to point out that the correct answer for
Spoiler (Rollover to View):
3 is XcX not XcXc
as stated earlier!
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Posted: Sun Nov 27, 2005 3:54 pm
JebJoya
Unfettered
Joined: 13 Apr 2005 Posts: 679 Location: UK
Just to say I wasted my 3 goes in 24 hours last night with
Spoiler (Rollover to View):
1. X
2. 0.25
3. XcX
and
1. X chromosome
2. 0.25
3. XcX
So I'm guessing that my answer to 2 is not written in the correct form - can anyone confirm how it gets accepted?
Jeb
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Last FM
Posted: Tue Nov 29, 2005 1:22 pm
Kvasir
Boot
Joined: 15 Oct 2005 Posts: 48
I'm probably wrong, but I don't agree about 2
Spoiler (Rollover to View):
A's father ("F") has a sinlg eX chromosome, and it is clear (otherwise he would be affected).
F's son / A's brother is colour blind, so A's mother ("M") must be a carrier.
M has two X chromosomes and one of the X chromosomes is affected.
A has two X chromosomes, one from comes from F (and must therefore be clear), and one from M. So she should have a 1/2 chance of being a carrier.
Or do my distant memories of biology lessons fail me?
Posted: Tue Nov 29, 2005 1:36 pm
ScarpeGrosse
Site Admin
Joined: 30 Nov 2002 Posts: 1678 Location: The Shiny Castle in the Sky, Full of Cotton Candy and Hazelnut Lattes
Kvasir wrote:
I'm probably wrong, but I don't agree about 2
Spoiler (Rollover to View):
A's father ("F") has a sinlg eX chromosome, and it is clear (otherwise he would be affected).
F's son / A's brother is colour blind, so A's mother ("M") must be a carrier.
M has two X chromosomes and one of the X chromosomes is affected.
A has two X chromosomes, one from comes from F (and must therefore be clear), and one from M. So she should have a 1/2 chance of being a carrier.
Or do my distant memories of biology lessons fail me?
No, because you're assuming in your analysis that the offspring will be a female. Really, you have a 1/2 chance of being a girl and 1/2 chance of being a boy PLUS a 1/2 chance of being a carrier = 1/4.
Punnett Square Time!
Code:
Xaff X (From mom)
X XaffX XX (female offspring; one carries Aff X)
Y XaffY XY (male offspring; one colorblind with AffX)
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Posted: Tue Nov 29, 2005 1:42 pm
serendipity01
Boot
Joined: 17 Nov 2005 Posts: 10 Location: saddleworth, uk
accepted answer
Spoiler (Rollover to View):
X
1/4
XcX
Posted: Thu Dec 01, 2005 7:28 am
TeamMfM
Boot
Joined: 26 Oct 2005 Posts: 17
Hi I dont know if anyone else noticed but there is a sheet of paper with writing on under the top sheet about colourblindness. You can sort of make out some of the words is there any way someone could enhance the writing underneath as they may have some relevance in regards to something
Posted: Fri Dec 02, 2005 11:55 am
looosy
Boot
Joined: 04 Aug 2005 Posts: 48 Location: Kent, England
No ones really explained the answer to 3 (maybe because its quite simple) but for your information:
B has to be a carrier to have an offspring with the disorder - therefore not XX
She can't be XcXc or else she would be colourblind herself (you need to have the colour blindness gene on both chromosomes in a woman to be affected).
Therefore XcX is the only possible option
I hope this helps people who didn't study genetics in Biology!
Posted: Mon Dec 05, 2005 6:13 pm
looosy
Boot
Joined: 04 Aug 2005 Posts: 48 Location: Kent, England
Quote:
I dont know if anyone else noticed but there is a sheet of paper with writing on under the top sheet about colourblindness. You can sort of make out some of the words is there any way someone could enhance the writing underneath as they may have some relevance in regards to something
I was thinking exactly the same thing - I can make out odd words so it looks like its genuine writing. it looks like "to apply for the .....power" under the first black square and the ?A
Anyone else???
Posted: Mon Dec 05, 2005 6:25 pm
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