Read the following family history and draw a pedigree to determine the inheritance pattern for achondroplasia. Once the pedigree is assembled , label the genotypes of each individual using a capital "A to represent the dominant allele and a lower case "a " to represent the recessive allele and create a key to identify which version is the achondroplasia allele. If you are unsure of the genotype , label the individual with a "" in place of the unknown allele. Family History : Jada and Noel , both of short stature, have been married for twenty years. They have three children : an eighteen - year-old boy named Shawn , of short stature ; a fifteen- year- old boy named John , of short stature ; and a twelve -year -old girl named Ann , of average height Noel and Jada also had a male child bom with severe achondroplasia who died six months after birth from respiratory failure . Noel's father was of short stature , while his mother was average height . Noel has a brother and a sister . His brother , Eddie , is average height and is married to Felicia , who is also average height Eddie and Felicia have two children , a boy and a girl, who are both average height. Noel's sister, Maria, is of short stature and married to a man of average height . They have no children. Jada's parents and her younger sister are all of average height . 1. Since Jada's parents and younger sister are all of average height, and achondroplasia is a dominant trait, how could she have developed this condition? Be sure to explain your answer based on the inheritance pattern. 2. Why don't Eddie and Felicia have to worry about having a child with achondroplasia? How do you know the genotypes of Eddie and Felicia?
Read the following family history and draw a pedigree to determine the inheritance pattern for achondroplasia.
Once the pedigree is assembled , label the genotypes of each individual using a capital "A to represent the dominant allele and a lower case "a " to represent the recessive allele and create a key to identify which version is the achondroplasia allele. If you are unsure of the genotype , label the individual with a "" in place of the unknown allele.
Family History : Jada and Noel , both of short stature, have been married for twenty years. They have three children : an eighteen - year-old boy named Shawn , of short stature ; a fifteen- year- old boy named John , of short stature ; and a twelve -year -old girl named Ann , of average height Noel and Jada also had a male child bom with severe achondroplasia who died six months after birth from respiratory failure . Noel's father was of short stature , while his mother was average height . Noel has a brother and a sister . His brother , Eddie , is average height and is married to Felicia , who is also average height Eddie and Felicia have two children , a boy and a girl, who are both average height. Noel's sister, Maria, is of short stature and married to a man of average height . They have no children. Jada's parents and her younger sister are all of average height .
1. Since Jada's parents and younger sister are all of average height, and achondroplasia is a dominant trait, how could she have developed this condition? Be sure to explain your answer based on the inheritance pattern.
2. Why don't Eddie and Felicia have to worry about having a child with achondroplasia? How do you know the genotypes of Eddie and Felicia?
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