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 Forum index » Diversions » Perplex City Puzzle Cards » PXC: Purple Puzzle Cards
[SOLVED] #178- Sex Linked
Moderators: AnthraX101, bagsbee, BrianEnigma, cassandra, Giskard, lhall, Mikeyj, myf, poozle, RobMagus, xnbomb
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GasparLewis
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Joined: 19 Nov 2005
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[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! Cool

PostPosted: Fri Nov 25, 2005 1:15 am
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European Chris
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[Spec] This is the second card about colour blindness-possible that it could relate to the story arc?[/spec]
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PostPosted: Fri Nov 25, 2005 4:50 am
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Wowbagger
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Joined: 22 Aug 2005
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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.

PostPosted: Fri Nov 25, 2005 7:45 am
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lillyplop
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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

PostPosted: Fri Nov 25, 2005 5:07 pm
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Atrophied
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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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PostPosted: Fri Nov 25, 2005 6:56 pm
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GasparLewis
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So, everybody pretty much agrees, then.
Just about accepted phrasing now, I guess. Laughing

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. Shocked

Edit: Bloody nitpickers, the lot of you... Laughing
And, now that we know the exact phrasings, this is a real SOLVED.

PostPosted: Sat Nov 26, 2005 10:33 pm
Last edited by GasparLewis on Tue Nov 29, 2005 12:42 am; edited 1 time in total
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Atrophied
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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
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PostPosted: Sun Nov 27, 2005 3:45 pm
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locqust
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Just to point out that the correct answer for
Spoiler (Rollover to View):
3 is XcX not XcXc

as stated earlier! Very Happy
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PostPosted: Sun Nov 27, 2005 3:54 pm
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JebJoya
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Joined: 13 Apr 2005
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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?

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PostPosted: Tue Nov 29, 2005 1:22 pm
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Kvasir
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Joined: 15 Oct 2005
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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?


PostPosted: Tue Nov 29, 2005 1:36 pm
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ScarpeGrosse
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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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PostPosted: Tue Nov 29, 2005 1:42 pm
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serendipity01
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Joined: 17 Nov 2005
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accepted answer

Spoiler (Rollover to View):

X
1/4
XcX


PostPosted: Thu Dec 01, 2005 7:28 am
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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

PostPosted: Fri Dec 02, 2005 11:55 am
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looosy
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Joined: 04 Aug 2005
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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!
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PostPosted: Mon Dec 05, 2005 6:13 pm
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looosy
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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???
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PostPosted: Mon Dec 05, 2005 6:25 pm
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