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Home Q & A Board Biology-Related Homework Help General Biology
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Bree1anonly Bree1anonly
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12 years ago
Phenylketonuria (PKU) is an inherited disease caused by a recessive allele. If a woman and her husband are both carriers, what is the probability of a PKU child being born out of three?
1. 0%

2. 75%

3. 18%

4. 25% Pouting Face

5. 100%
Source  campbell
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Answer rejected by topic starter
wrote...
#1
Staff Member
12 years ago
Quote from: Bree1anonly (12 years ago)
4. 25%

Rr x Rr will give you 3 to 1, so 25%.
- Master of Science in Biology
- Bachelor of Science
Bree1anonly Author
wrote...
#2
12 years ago
the real answer is 75%
wrote...
#3
Staff Member
12 years ago
It happens when the kid has both recessive alleles (rr), and if the parents are both carriers, they are heterozygous dominant Rr... I stand by my answer unless you can prove me wrong Undecided

    R  r
R  RR Rr
r   Rr  rr
- Master of Science in Biology
- Bachelor of Science
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