Kent and Emily have a baby boy Dustin by in vitro fertilizat

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: I^A I^B : Rh⁺ Rh⁺ or I^A I^B : Rh⁺ Rh^-

^b). Kent’s possible genotypes:

I^A I^A : Rh⁺ Rh⁺ or I^A I^A : Rh⁺ Rh^- or I^A i : Rh⁺ Rh⁺ or I^A i : Rh⁺ Rh^-

c). Emily’s possible genotypes: I^B I^B : Rh^- Rh^- or I^B i : Rh^- Rh^-

d). Yes Dustin belongs to Kenta and Emily’s son.

e).

The gamete, I^A: Rh⁺ of Kent’s and the gamete, I^B: Rh^- of Emily’s fuse to produce I^A I^B : Rh⁺ Rh^- (AB-positive).

Rh+ is dominant over Rh-

I^A & I^B are codominant.

f). Carrie’s genotype (AB-positive): I^AI^B: Rh⁺Rh^-

g). Ryan’s genotype (AB-negative): I^AI^B: Rh^-Rh^-

I^AI^B: Rh⁺Rh^- x   I^AI^B: Rh^-Rh^-

I^ARh^-

I^BRh^-

I^ARh⁺

I^AI^A Rh⁺Rh^-

(A⁺)

I^AI^BRh⁺Rh^{- \\}

(AB⁺)

I^A Rh^-

I^AI^A Rh^-Rh^-

(A^-)

I^AI^B Rh^-Rh^-

(AB^-)

	IARh-	IBRh-
IARh+	IAIA Rh+Rh- (A+)	IAIBRh+Rh- \\ (AB+)
IA Rh-	IAIA Rh-Rh- (A-)	IAIB Rh-Rh- (AB-)