Cystic Fibrosis

by windy_sydney

A question asked by Nikki:Cystic fibrosis (CF) is caused by a recessive allele. A child has Cystic Fibrosis, even though neither of his parents……
…….has CF. If this couple has another child, what is the probability he or she will NOT have Cystic Fibrosis?

a. 3/4
b. 2/3
c. 2/4
d. 1/3
e. 1/4

Top answer:

Answer by Dsf S
3/4

How about adding your own answer to the comments below!

Technorati Tags: allele, caused, child, cystic, even, fibrosis, neither, Parents, Recessive, though

A question from Secret Wish: Cystic fibrosis (CF) is caused by a recessive allele. A child has CF, even though neither of his parents has ?
CF. What can you conclude about the parents?

A. they are both homozygous dominant for the CF gene.

B. they are both homozygous recessive for the CF gene.

C. one is homozygous dominant for the CF gene, the other is heterozygous.

D. one is homozygous recessive for the CF gene, the other is heterozygous.

E. they are both heterozygous for the CF gene

Top answer:

Answer by snickers
E. They are both carriers of CF.

Do you know better? Why not leave your own answer in the comments below!

Technorati Tags: allele, caused, child, cystic, even, fibrosis, neither, Parents, Recessive, though

A question asked by decemberkitty02: If two parents are carriers of cystic fibrosis (and do not have the disorder), what is the probability?
If two parents are carriers of cystic fibrosis (and do not have the disorder), what is the probability that their first child will have CF and their second child will not?

I thought that it would 3/16s? Is this correct?

The No 1 answer:

Answer by Russ
Theyre both Aa, so its {AA,Aa,Aa,aa}, so P(having the disease) = 1/4, and P(not having the disease) = 3/4
Multiply the two and you get 3/16. So you are correct

Agree or disagree? Leave your own thoughts below.

Technorati Tags: carriers, cystic, disorder, fibrosis, Parents, Probability

Question posed by kelli: If Both parents are carriers for cystic fibrosis will each baby be born with it or at least a carrier?
1st pregnancy baby had full blown cf(rip), 2nd baby is just a carrier. Is it possible for the 3rd pregnancy not have cf or even be a carrier???

The No 1 answer:

Answer by kik
1/2 chance to being a carrier, 1/4 chance to having full blown, and 1/4 chance to being normal and not a carrier.

Just so you know, I know nothing about cystic fibrosis so yea….

Whether you agree or disagree, why not leave your own thoughts below.

Technorati Tags: baby, born, both, Carrier, carriers, cystic, each, fibrosis, least, Parents

[ReviewAZON asin="0816614881"]

Technorati Tags: birth, childhood, cystic, Disorders, fibrosis, guide, guides, minnesota, Parents, university

A question from ashleyrachelle_21: Do both Parents have to be Cystic Fibrosis carriers for a child to get it?
My son has alot of Respitory issues and has alot of weight gain problems as well. He is going tommorrow tohave a sweat test done…I have talked to my midwife to confirm that my CF carrier screening that was done during my prenatal blood work was negative but she was unsure about both parents having to be carriers for my child to get it. I have serached all day for answers and can not find a definite answer. PLEASE HELP!

Top answer:

Answer by JoyC
Yes, for someone to have the disease, two copies of the defective CF gene must be inherited—one from each parent.

Whether you agree or disagree, why not leave your own thoughts below.

Technorati Tags: both, carriers, child, cystic, fibrosis, Parents

by windy_sydney

A question from Microbiology2011: If two parents, are heterozygous carriers of the autosomal recessive gene causing cystic fibrosis,?
If two parents, are heterozygous carriers of the autosomal recessive gene causing cystic fibrosis,
have 5 children, what is the probability that: (8pts)
a. three will be normal?
b. four will have cystic fibrosis?
c. all are normal?

The best answer:

Answer by Julie
You’ve got a 50% chance of a carrier, 25% chance of one effected, and 25% of a normal offspring.

Chance of three being normal= .25x.25x.25… so 1.5625%
Chance of four having CF= .25x.25x.25x.25= .039%
chance of five being normal=.25x.25x.25x.25x.25= .097%

How about adding your own answer to the comments below!

Technorati Tags: autosomal, carriers, causing, cystic, fibrosis, gene, heterozygous, Parents, Recessive

asked:

1. In order for a child to have cystic fibrosis, BOTH parents have to carry the gene? or can a child become infected if ony one parent is a carrier?

2. How can one be tested for cystic fibrosis? can both a women and man get tested for this?

Technorati Tags: Babies, Cystic Fibrosis, Parents

Technorati Tags: Child Carrier, Cystic Fibrosis, Parents

Technorati Tags: Autosomal Recessive Disorder, Cf, Parents