2. Joanna has "short fingers" (brachydactyly). She has two older brothers who are identical twins; both have short fingers. Joanna's two younger sisters have normal fingers. Joanna's mother has normal fingers, and her father has short fingers. Joanna's paternal grandmother (her father's mother) has short fingers; her paternal grandfather (her father's father), who is now deceased, had normal fingers. Both of Joanna's maternal grandparents (her mother's parents) have normal fingers. Joanna marries Tom, who has normal fingers; they adopt a son named Bill who has normal fingers. Bill's biological parents both have normal fingers. After adopting Bill, Joanna and Tom produce two children: an older daughter with short fingers and a younger son with normal fingers. a. Using standard symbols and labels, draw a pedigree illustrating the inheritance of short fingers in Joanna's family. b. What is the most likely mode of inheritance for short fingers in this family? c. If Joanna and Tom have another biological child, what is the probability (based on your answer to part b) that this child will have short fingers?
2. Joanna has "short fingers" (brachydactyly). She has two older brothers who are identical twins; both have short fingers. Joanna's two younger sisters have normal fingers. Joanna's mother has normal fingers, and her father has short fingers. Joanna's paternal grandmother (her father's mother) has short fingers; her paternal grandfather (her father's father), who is now deceased, had normal fingers. Both of Joanna's maternal grandparents (her mother's parents) have normal fingers. Joanna marries Tom, who has normal fingers; they adopt a son named Bill who has normal fingers. Bill's biological parents both have normal fingers. After adopting Bill, Joanna and Tom produce two children: an older daughter with short fingers and a younger son with normal fingers. a. Using standard symbols and labels, draw a pedigree illustrating the inheritance of short fingers in Joanna's family. b. What is the most likely mode of inheritance for short fingers in this family? c. If Joanna and Tom have another biological child, what is the probability (based on your answer to part b) that this child will have short fingers?
Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter16: Reproductive Technology, Genetic Testing, And Gene Therapy
Section: Chapter Questions
Problem 16QP: A couple has had a child born with neurofibromatosis. They come to your genetic counseling office...
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Transcribed Image Text:2. Joanna has "short fingers" (brachydactyly). She has two older brothers who
are identical twins; both have short fingers. Joanna's two younger sisters
have normal fingers. Joanna's mother has normal fingers, and her father has
short fingers. Joanna's paternal grandmother (her father's mother) has short
fingers; her paternal grandfather (her father's father), who is now deceased,
had normal fingers. Both of Joanna's maternal grandparents (her mother's
parents) have normal fingers. Joanna marries Tom, who has normal fingers;
they adopt a son named Bill who has normal fingers. Bill's biological parents
both have normal fingers. After adopting Bill, Joanna and Tom produce two
children: an older daughter with short fingers and a younger son with normal
fingers.
a. Using standard symbols and labels, draw a pedigree illustrating the
inheritance of short fingers in Joanna's family.
b. What is the most likely mode of inheritance for short fingers in this family?
c. If Joanna and Tom have another biological child, what is the probability
(based on your answer to part b) that this child will have short fingers?
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