WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
5th Edition
ISBN: 9781319516116
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 9, Problem 8MC
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A male with an X chromosome carrying an allele for a condition will be affected by the condition.
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Amelogenesis imperfecta (AI) is a disorder of faulty tooth enamel formation. It is inherited in an autosomal dominant and X-linked dominant pattern. The expression of AI disorder is determined by mutations in the autosomal alleles. One copy of the mutated allele (A) will cause the disorder. The severity of the disorder is determined by mutations in a gene carried on the X chromosome. Normal (or non-severe) abnormality (XN) is dominant over the abnormality (or severe) (Xn) allele. In the absence of the autosomal dominant allele, the abnormality gene on the X chromosome is not expressed. Question:A woman with normal teeth had four children with a man with non-severe form of AI:
A boy was born without amelogenesis imperfecta
A girl was born without amelogenesis imperfecta
A boy was born with severe amelogenesis imperfecta
A boy was born with non severe amelogenesis imperfecta
Identify the parental genotypes.
Complete the Punnett square for the parental cross, and identify the…
Amelogenesis imperfecta (AI) is a disorder of faulty tooth enamel formation. It is inherited in an autosomal dominant and X-linked dominant pattern. The expression of AI disorder is determined by mutations in the autosomal alleles. One copy of the mutated allele (A) will cause the disorder. The severity of the disorder is determined by mutations in a gene carried on the X chromosome. Normal (or non-severe) abnormality (XN) is dominant over the abnormality (or severe) (Xn) allele. In the absence of the autosomal dominant allele, the abnormality gene on the X chromosome is not expressed. Question:A woman with normal teeth had four children with a man with non-severe form of AI:
A boy was born without amelogenesis imperfecta
A girl was born without amelogenesis imperfecta
A boy was born with severe amelogenesis imperfecta
A boy was born with non severe amelogenesis imperfecta
Identify the parental genotypes.
Complete the Punnett square for the parental cross, and identify the…
y 301
Amelogenesis imperfecta is X-linked dominant. Affected XY individuals have
extremely thin enamel on the teeth while XX carriers have grooved teeth from
uneven deposition of enamel. If an unaffected XY individual were to produce
children with a XX carrier partner,
a. what would be the expected chance of a XY child being affected with the
disease?
b. what would be the expected chance of a XY child being affected with the
disease?
Chapter 9 Solutions
WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
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- Lauren reports that she had a maternal male cousin (through a maternal aunt) and a maternal great uncle (maternal grandmother’s brother) both pass away from the same x-linked lethal condition. Both affected individuals did not have genetic testing. Lauren has a normal carrier screen for x-linked lethal conditions, which you know identifies 40% of causative mutations. If Lauren is currently pregnant with a male child, what is the chance that this child will have the condition?arrow_forwardDuchenne muscular dystrophy is sex linked and usuallyaffects only males. Victims of the disease become progressively weaker, starting early in life.a. What is the probability that a woman whose brotherhas Duchenne’s disease will have an affected child?b. If your mother’s brother (your uncle) had Duchenne’sdisease, what is the probability that you have receivedthe allele?c. If your father’s brother had the disease, what is theprobability that you have received the allele?arrow_forwardX-linked disorders (like hemophilia) are more likely to affect people of one gender than the other. Which gender is this, and why are x-linked disorders more likely to affect people of this gender?arrow_forward
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