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Kent and Emily have a baby boy Dustin by in vitro fertilization. Dustin does not resemble either
one of his parents, so they suspect that the clinic made a mistake during the procedure and
implanted the wrong embryo. At Dustin's first well-baby checkup they insist that they get his
blood type. Baby Dustin is type B-negative. Kent is A-positive and Emily is AB-positive. Given
this information answer the following questions. (a) What are Dustin's possible genotypes?
__________ (b) What are Kent's possible genotypes? __________ (c) What are Emily's
possible genotypes? __________ (d) Is it possible that Dustin is Kent and Emily's son?
__________ (e) Explain your answer in (d) __________ Carrie is AB-positive and her father is
AB-negative. Carrie marries Ryan, who is AB-negative. (f) What is Carrie's genotype?
__________ (g)What is Ryan's genotype? __________ (h) What are the phenotypic ratios of
blood types (for both the ABO gene and Rh gene) that would be expected among their children?
__________ (Show your work in a Punnett square below!)
Solution
Answer:
a). Dustin’s possible genotypes: IA IB : Rh+ Rh+ or IA IB : Rh+ Rh-
b). Kent’s possible genotypes:
IA IA : Rh+ Rh+ or IA IA : Rh+ Rh- or IA i : Rh+ Rh+ or IA i : Rh+ Rh-
c). Emily’s possible genotypes: IB IB : Rh- Rh- or IB i : Rh- Rh-
d). Yes Dustin belongs to Kenta and Emily’s son.
e).
The gamete, IA: Rh+ of Kent’s and the gamete, IB: Rh- of Emily’s fuse to produce IA IB : Rh+
Rh- (AB-positive).
Rh+ is dominant over Rh-
IA & IB are codominant.
f). Carrie’s genotype (AB-positive): IAIB: Rh+Rh-
g). Ryan’s genotype (AB-negative): IAIB: Rh-Rh-
IAIB: Rh+Rh- x IAIB: Rh-Rh-
IARh-
IBRh-
IARh+
IAIA Rh+Rh-
(A+)
IAIBRh+Rh- 
(AB+)
IA Rh-
IAIA Rh-Rh-
(A-)
IAIB Rh-Rh-
(AB-)
IARh-
IBRh-
IARh+
IAIA Rh+Rh-
(A+)
IAIBRh+Rh- 
(AB+)
IA Rh-
IAIA Rh-Rh-
(A-)
IAIB Rh-Rh-
(AB-)

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Kent and Emily have a baby boy Dustin by in vitro fertilization. Dust.pdf

  • 1. Kent and Emily have a baby boy Dustin by in vitro fertilization. Dustin does not resemble either one of his parents, so they suspect that the clinic made a mistake during the procedure and implanted the wrong embryo. At Dustin's first well-baby checkup they insist that they get his blood type. Baby Dustin is type B-negative. Kent is A-positive and Emily is AB-positive. Given this information answer the following questions. (a) What are Dustin's possible genotypes? __________ (b) What are Kent's possible genotypes? __________ (c) What are Emily's possible genotypes? __________ (d) Is it possible that Dustin is Kent and Emily's son? __________ (e) Explain your answer in (d) __________ Carrie is AB-positive and her father is AB-negative. Carrie marries Ryan, who is AB-negative. (f) What is Carrie's genotype? __________ (g)What is Ryan's genotype? __________ (h) What are the phenotypic ratios of blood types (for both the ABO gene and Rh gene) that would be expected among their children? __________ (Show your work in a Punnett square below!) Solution Answer: a). Dustin’s possible genotypes: IA IB : Rh+ Rh+ or IA IB : Rh+ Rh- b). Kent’s possible genotypes: IA IA : Rh+ Rh+ or IA IA : Rh+ Rh- or IA i : Rh+ Rh+ or IA i : Rh+ Rh- c). Emily’s possible genotypes: IB IB : Rh- Rh- or IB i : Rh- Rh- d). Yes Dustin belongs to Kenta and Emily’s son. e). The gamete, IA: Rh+ of Kent’s and the gamete, IB: Rh- of Emily’s fuse to produce IA IB : Rh+ Rh- (AB-positive). Rh+ is dominant over Rh- IA & IB are codominant. f). Carrie’s genotype (AB-positive): IAIB: Rh+Rh- g). Ryan’s genotype (AB-negative): IAIB: Rh-Rh- IAIB: Rh+Rh- x IAIB: Rh-Rh- IARh- IBRh- IARh+ IAIA Rh+Rh- (A+) IAIBRh+Rh- (AB+)
  • 2. IA Rh- IAIA Rh-Rh- (A-) IAIB Rh-Rh- (AB-) IARh- IBRh- IARh+ IAIA Rh+Rh- (A+) IAIBRh+Rh- (AB+) IA Rh- IAIA Rh-Rh- (A-) IAIB Rh-Rh- (AB-)