Jim and Pam would like to have a baby, but they know that albinism (an autosomal recessive disease) runs in both of their families. They do a genetic test, and learn that they are both carriers of the disease allele. What is the chance that their baby will have albinism? hint: use a punnet square O 2/3 1/8 O 1/4 Ο 1/16 O 1/2
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- Karen and Steve each have a sibling with sickle-cell disease.Neither Karen nor Steve nor any of their parents have thedisease, and none of them have been tested to see if they carrythe sickle-cell allele. Based on this incomplete information,calculate the probability that if this couple has a child, thechild will have sickle-cell disease.Huntington disease is a rare fatal, degenerative neurological disease in which individuals start to showsymptoms in their 40s. It is caused by a dominant allele. Joe, a man in his 20s, just learned that his fatherhas Huntington disease.a. What is the probability that Joe will also developthe disease?b. Joe and his new wife have been eager to start afamily. What is the probability that their first childwill eventually develop the disease?A recently married man and woman discover that eachhad an uncle with alkaptonuria (black urine disease), arare disease caused by an autosomal recessive allele of asingle gene. They are about to have their first baby. Whatis the probability that their child will have alkaptonuria?
- A young couple went to see a genetic counselor because each had a sibling with cystic fibrosis. (Cysticfibrosis is a recessive disease, and neither member ofthe couple nor any of their four parents is affected.)a. What is the probability that the female of thiscouple is a carrier?b. What are the chances that their child will havecystic fibrosis?c. What is the probability that their child will be acarrier of the cystic fibrosis disease allele?a human disease known as cystic fibrosis is inherited as a recessive trait.Two unaffected individuals have a first child with the disease. What isthe probability that their next two children will not have the disease?Two mothers give birth to sons at the same time at a busy urbanhospital. The son of mother 1 has hemophilia, a disease causedby an X-linked recessive allele. Neither parent has the disease.Mother 2 has a son without hemophilia, despite the fact thatthe father has hemophilia. Several years later, couple 1 suesthe hospital, claiming that these two newborns were swappedin the nursery following their birth. As a genetic counselor, youare called to testify. What information can you provide the juryconcerning the allegation?
- Neither Tim nor Rhoda has Duchenne muscular dystrophy, but their firstborn son does. What is the probabilitythat a second child will have the disease? What is theprobability if the second child is a boy? A girl?Jim and Pam would like to have a baby, but they know that albinism (an autosomal recessive disease) runs in both of their families. They do a genetic test, and learn that they are both carriers of the disease allele. What is the chance that their baby will have albinism? hint: use a punnet square Group of answer choices 1. 1/4 2. 2/3 3. 1/2 4. 1/8 5. 1/16Both members of a couple know that they are carriers of the cysticfibrosis allele. None of their three children has cystic fibrosis, but anyone of them might be a carrier. The couple would like to have a fourthchild but are worried that he or she would very likely have the disease,since the first three do not. What would you tell the couple? Would itremove some uncertainty from their prediction if they could find outwhether the three children are carriers?
- Albinism, a condition characterized by a partial or total lack ofskin pigment, is a recessive human trait. If a phenotypically unaffected couple produce an albino child, what is the probability thattheir next child will be albino?Is the blueness a recessive trait why and why not What was Elizabeth smith only possible genotype ? why? Why did zachry marrying his aunt cause him to have the blue sons ?Huntington disease is a rare dominant condition in humans that results in a slow but inexorable deteriorationof the nervous system. The disease shows what mightbe called age-dependent penetrance, which is to saythat the probability that a person with the Huntingtongenotype will express the phenotype varies with age.Assume that 50% of those inheriting the HD allele willexpress the symptoms by age 40. Susan is a 35-yearold woman whose father has Huntington disease. Shecurrently shows no symptoms. What is the probabilitythat Susan will show symptoms in five years?