Question

1. two parents had blood types o and ab.

what is the percent chance of producing a
child with type ab blood?
a. 0%
b. 25%
c. 50%
d. 100%

1. two parents both had blood type a. in

order for them to produce a child with
type o blood, they must both have what
genotype?
a. $i^a i^a$
b. $i^a i$
c. $i^a i^b$
d. $ii$

Explanation:

Step1: Identify parent genotypes (Q19)

Blood type O = $ii$, blood type AB = $I^A I^B$

Step2: Set up Punnett square (Q19)

	$I^A$	$I^B$
$i$	$I^A i$	$I^B i$

Step3: Calculate AB blood chance (Q19)

No $I^A I^B$ genotypes, so chance = $0\%$

Step4: Identify A blood genotypes (Q20)

Blood type A can be $I^A I^A$ or $I^A i$

Step5: Test genotypes for O child (Q20)

Only $I^A i \times I^A i$ produces $ii$ (O blood):

	$I^A$	$i$
$i$	$I^A i$	$ii$

Answer:

1. A. 0%
2. B. $I^A i$