2e. What is the probability that Isabella's future son would be affected by ichthyosis? Explain.

Biology (MindTap Course List)
11th Edition
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Chapter16: Human Genetics And The Human Genome
Section16.3: Genetic Diseases Caused By Single-gene Mutations
Problem 7LO: State whether each of the following genetic defects is inherited as an autosomal recessive,...
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2c. Provide genotypes for the following individuals based on the pedigree. Use a "?" if an allele cannot be
determined from the information given. Do not assume partners are unaffected so use "?" when an allele
cannot be determined.
Dylan's partner:
David's father:
David's mother:
Sofia's mother:
Sofia:
Diego:
Isabella:
Camila:
2d. What is the probability that Isabella's future daughter would be affected by ichthyosis if her partner is
unaffected? Explain.
2e. What is the probability that Isabella's future son would be affected by ichthyosis? Explain.'
Transcribed Image Text:2c. Provide genotypes for the following individuals based on the pedigree. Use a "?" if an allele cannot be determined from the information given. Do not assume partners are unaffected so use "?" when an allele cannot be determined. Dylan's partner: David's father: David's mother: Sofia's mother: Sofia: Diego: Isabella: Camila: 2d. What is the probability that Isabella's future daughter would be affected by ichthyosis if her partner is unaffected? Explain. 2e. What is the probability that Isabella's future son would be affected by ichthyosis? Explain.'
2. David has ichthyosis, which is an X-linked recessive skin condition that is caused by a deficiency of the
enzyme steroid sulfatase. The deficiency disrupts cholesterol sulfate metabolism; cholesterol sulfate plays a
role in maintaining skin integrity. The normal shedding of dead skin cells is inhibited, and skin cells build
up and clump into scales. The application of skin softening creams, lotions and other topical treatments
lessens the severity of symptoms.
David's partner Sofia is the daughter of David's maternal aunt. David and Sofia have two sons, Diego and
Daniel, and one daughter, Isabella, all of whom have ichthyosis. They also have two unaffected daughters,
Mia and Camila. David's maternal grandfather, Dylan, is also affected by ichthyosis.
2a. Based on the family described above, draw a pedigree indicating individual names, biological sex
(square or circle), affected/unaffected (shaded/unshaded), and relationship connections. If the individual in
the pedigree has not been specifically mentioned to have ichthyosis, assume they do not have the condition.
2b. Describe how the pedigree you drew is consistent with X-linked recessive inheritance? Explain your
answer by providing at least TWO pieces of evidence taken from the pedigree.
Transcribed Image Text:2. David has ichthyosis, which is an X-linked recessive skin condition that is caused by a deficiency of the enzyme steroid sulfatase. The deficiency disrupts cholesterol sulfate metabolism; cholesterol sulfate plays a role in maintaining skin integrity. The normal shedding of dead skin cells is inhibited, and skin cells build up and clump into scales. The application of skin softening creams, lotions and other topical treatments lessens the severity of symptoms. David's partner Sofia is the daughter of David's maternal aunt. David and Sofia have two sons, Diego and Daniel, and one daughter, Isabella, all of whom have ichthyosis. They also have two unaffected daughters, Mia and Camila. David's maternal grandfather, Dylan, is also affected by ichthyosis. 2a. Based on the family described above, draw a pedigree indicating individual names, biological sex (square or circle), affected/unaffected (shaded/unshaded), and relationship connections. If the individual in the pedigree has not been specifically mentioned to have ichthyosis, assume they do not have the condition. 2b. Describe how the pedigree you drew is consistent with X-linked recessive inheritance? Explain your answer by providing at least TWO pieces of evidence taken from the pedigree.
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