Question

Cystic fibrosis is a genetic disease. People with CF have inherited two copies of the defective CF gene -- one copy from each parent. Both parents must have at least one copy of the defective gene. People with only one copy of the defective CF gene are called carriers, but they do not have the disease. Each time two CF carriers have a child, the chances are: 25 percent (1 in 4) the child will have CF 50 percent (1 in 2) the child will be a carrier but will not have CF 25 percent (1 in 4) the child will not be a carrier and will not have CF 1. In a random sample of 10 families in which both parents are CF carriers and have one child, the probability that we observe at least two children who is a carrier but do not have CF is [prob1]. 2. The expected number of families with a child who is not a carrier and does not have CF is [prob2].

          Cystic fibrosis is a genetic disease. People with CF have inherited two copies of the defective CF gene -- one copy from each parent. Both parents must have at least one copy of the defective gene. People with only one copy of the defective CF gene are called carriers, but they do not have the disease. Each time two CF carriers have a child, the chances are:

25 percent (1 in 4) the child will have CF
50 percent (1 in 2) the child will be a carrier but will not have CF
25 percent (1 in 4) the child will not be a carrier and will not have CF

1. In a random sample of 10 families in which both parents are CF carriers and have one child, the probability that we observe at least two children who is a carrier but do not have CF is [prob1].
2. The expected number of families with a child who is not a carrier and does not have CF is [prob2].

Cystic fibrosis is a genetic disease. People with CF have inherited two copies of the defective CF gene – one copy from each parent. Both parents must have at least one copy of the defective gene. People with only one copy of the defective CF gene are called carriers, but they do not have the disease. Each time two CF carriers have a child, the chances are:

25 percent (1 in 4) the child will have CF
50 percent (1 in 2) the child will be a carrier but will not have CF
25 percent (1 in 4) the child will not be a carrier and will not have CF

1. In a random sample of 10 families in which both parents are CF carriers and have one child, the probability that we observe at least two children who is a carrier but do not have CF is [prob1].
2. The expected number of families with a child who is not a carrier and does not have CF is [prob2].

Added by Adriana R.

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