1.Albinism is a condition in which pigmentation is lacking. in humans the result
ID: 30662 • Letter: 1
Question
1.Albinism is a condition in which pigmentation is lacking. in humans the result is white hair, nonpigmented skin, and pink eyes. The trait in humans is csaued by a recessive allele. Two normal parents have an albino child. What are the parents' genotpes? What is the probability that the next child will be albino?
2.A young couple went to see a genetic counselor because each had a sibling affected with cystic fribrosis. Cystic fibrosis is a recessive disease, and neither memeber of the couple nor any of their four patens is affected.a) What is the probability that the femaile of this couple is a carrier? b) What are the chances that their child will be affected with cystic fibrosis? c)What is the probability that their child will be a carrier of thecystic fibrosis mutation?
Explanation / Answer
1. The genotype of parents would be Aa and Aa. out of four possibilties one is of albino, so 0.25 would be the probability of next child being albino.
2. a) The probability of female being a carrier is 0.5. ( two possibilties AA and Aa).
b) case 1: father and mother are not carrier : the probability of child having cystic fibrosis is 0 .
case 2: father is not carrier and mother is carrier: the probability of child having cystic fibrosis is 0 .
case 3: father and mother, both are carrier : the probability of child having cystic fibrosis is 0.25 .
c) case 1: father and mother are not carrier : the probability of child being carrier of cystic fibrosis is 0 .
case 2: father is not carrier and mother is carrier: the probability of child being carrier of cystic fibrosis is 0.5 .
case 3: father and mother, both are carrier : the probability of child being carrier of cystic fibrosis is 0.5 .
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.