Answered: their 8-year old boy with progressive…

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter42: Animal Development

Section: Chapter Questions

Problem 1DAA

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Suppose a couple brought to you their 8-year old boy with progressive muscle weakness, and difficulty in motor skills resulting to awkward manner of walking and running . The boy’s 15-year old sister and
11-year old brother appear to be unaffected. They have a normal father and a normal pregnant mother. The mother had a brother who died at 26 yrs. of age with similar findings that seemed to worsen with age. The mother also has a sister with the same findings but it only manifested during her 28 th year. Her sister, who married an unaffected man, has two affected sons and a normal daughter.
You suspect a diagnosis of Duchenne Muscular Dystrophy (DMD).

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