Thursday, July 7th, 2011 at
5:39 pm
A question from Helen: Genetics Problem ?????????????
Cystic fibrosis is a serious genetic disease caused by an autosomal recessive allele (C= normal and c= cystic fibrosis). This trait is not rare amongst humans; approximately 1 in 25 people in human populations are carriers (i.e. heterozygous for this allele). A woman and her husband (neither of whom have the disease) are considering having children, but the woman’s brother (there were only two children in the family) has cystic fibrosis. On the other hand, the woman’s parents and her maternal grandparents (i.e. her mother’s parents) did not have the disease.
a. Draw a partial pedigree showing all of the individuals mentioned and give their genotypes as fully as possible (hint: there may be uncertainty for some).
b. What is the33 probability that the first child produced by this couple will have cystic fibrosis?
No 1 answer:
Answer by Elisa
use a punnett square. its not that difficult.
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Technorati Tags: GENETICS, problem
Wednesday, July 6th, 2011 at
1:41 pm
Question by edgygirl: Genetics question for Biology?
imagine that you are a genetic counselor, and a couple planning to start a family comes to you for information. Charles was married once before, and he and his first wife had a child with cystic fibrosis. The brother of his current wife, Elaine, died of cystic fibrosis. What is the probability that Charles and Elaine will have a child with cystic fibrosis. Neither Charles or Elaine has cystic fibrosis.
I know the answer is 1/6 but how do you get that?
how many punnet squares do i draw? and put what on each of the two sides. thats what i need help with.
No 1 answer:
Answer by Yote
do a punnet square!
What do you think? Leave you answer below!
Technorati Tags: Biology, GENETICS, question
Wednesday, July 6th, 2011 at
1:41 pm
A question asked by edgygirl: Genetics question for Biology?
imagine that you are a genetic counselor, and a couple planning to start a family comes to you for information. Charles was married once before, and he and his first wife had a child with cystic fibrosis. The brother of his current wife, Elaine, died of cystic fibrosis. What is the probability that Charles and Elaine will have a child with cystic fibrosis. Neither Charles or Elaine has cystic fibrosis.
I know the answer is 1/6 but how do you get that?
how many punnet squares do i draw? and put what on each of the two sides. thats what i need help with.
Most detailed answer:
Answer by Yote
do a punnet square!
Do you know better? Why not leave your own answer in the comments below!
Technorati Tags: Biology, GENETICS, question
Tuesday, July 5th, 2011 at
9:40 am
A question from kobe24: Are there carrier forms and or lethal forms of cystic fibrosis ?
Most comprehensive answer:
Answer by xXBlizzXx
Cystic fibrosis never really kills suddenly, but it does shorten lifespan somewhat, so I would call all forms of it “lethal”.
What do you think? Leave you answer below!
Technorati Tags: Carrier, cystic, fibrosis, forms, lethal, there
Monday, July 4th, 2011 at
5:36 am
Question posed by Kenzie: Anyone with cystic fibrosis?
Just wondering 
lol
And if you do know someone with cystic fibrosis, what is their lung function and what are their treatments? i’m sorry, you don’t have to say i’m just really curious…i’ve never met anyone else with it so i don’t really know what’s “normal” and i guess that’s what i’m asking.
my lung function (fev1) is around 60%.
I do vest 30 mins 3 times a day
pulmozyme, hypertonic saline, tobi, zithromax, vitaman d and e, multivitams, enzymes, and right now cipro and bactrim and prednisone.
Best answer:
Answer by Dixie
One of the toughest things about CF, I think, is that you all can’t meet others with it because of possible contamination of bacteria.
I work in a CF clinic. You don’t say how old you are, but I’m guessing teenage. Your lung function is about average, and you take about the same amount of meds as most of the teens and 20 somethings in my clinic (leaving out the cipro and bactrim, sounds like you’re having an exacerbation).
Most of my patients do the vest twice and day and bump it up to three or four times when they’re sick.
I’m sure there are support groups on line, hope you meet up with someone that way.
Provide your own answer to this question below!
Technorati Tags: anyone, cystic, fibrosis
Sunday, July 3rd, 2011 at
1:38 am
A question asked by damigurl05: Genetics Pt. 1?
A man and a woman are both heterozygous for Cystic Fibrosis, an autosomal recessive disease. They have 16 pre-embryos screened for the disease. How many will be homozygous dominat, homozygous recessive and heterozygous. How many will be affected, how many will be carriers, and how many will not be affected?
Best answer:
Answer by TinklePuff741
C – Normal allele (dominant)
c – Cystic fibrosis allele (recessive)
Affected genotype: cc (homozygous recessive)
Carrier genotype: Cc (heterozygous / carriers)
Unaffected genotype: CC (homozygous dominant)
Man: Cc
Woman: Cc
Probability of embryos having:
CC genotype = 0.25
Cc genotype = 0.50
cc genotype = 0.25
Multiply the probability by the whole number (16) of embryos to get the predicted number of embryos with each genotype:
CC = 0.25 x 16 = 4
Cc = 0.50 x 16 = 8
cc = 0.25 x 16 = 4
Agree or disagree? Leave your own thoughts below.
Technorati Tags: GENETICS
Friday, July 1st, 2011 at
9:37 pm
Question by Tyler: Which disease is more rigorous and hard to endure? HIV/AIDS or Cystic Fibrosis?
For my junior year AP English Language class, I need to write a 1,500-2,000 word research paper proving a scientific point. I want to prove one of the above stated diseases is more rigorous and hard to endure with symptoms, treatment, etc.but I can’t really decide which one is more of an “ugly” disease? Thank you!
Chosen answer:
Answer by Q
Does one have to be worse? Couldn’t you argue that one is worse in some respects, while the other is worse in other respects?
Cystic Fibrosis–because the feeling of not being able to breathe is horrible horrible horrible. And you’re guaranteed to die at a young age.
AIDS–because there is a lot of prejudice against those with AIDS. And you never know what sickness you’ll get next.
But to a certain extent you can’t compare suffering. And because both diseases have different courses to them, some with CF are far sicker than some with AIDS, while others with AIDS are far sicker than a given person with CF.
Provide your own answer to this question below!
Technorati Tags: cystic, disease, endure, fibrosis, hard, HIV/AIDS, more, rigorous
