Question

Written answer/problems. Type the full answer to each part of the question. George is blood type...

Written answer/problems. Type the full answer to each part of the question.

George is blood type B, and his father is blood type A. Sally is blood type B and both of her parents are blood type AB.

  1. List all the possible genotypes of George's mother:
  2. List all the possible blood types of George and Sally's offspring:
  3. What is the probability that George and Sally's first child will be blood type O?
  4. What is the probability that George & Sally's second child will be blood type B?

Homework Answers

Answer #1

1. George mother = IaIa, IaIo

2. George = IbIb, IbIo

Sally = IbIb, IbIo

George and Sally offsprings -

1. IbIb × IbIb = IbIb (B)

2. IbIo × IbIo = IbIb (B), IbIo (B), IoIo (O)

3. IbIb × IbIo = IbIb (B), IbIo (O)

3. Their child will have O blood type only if both George and Sally are IbIo.

Probability that George is IbIo = 1/2

Probability that Sally is IbIo = 1/2

IbIo × IbIo

Gametes Ib Io
Ib IbIb B IbIo B
Io IbIo B IoIo O

Probability of IoIo (O) = 1/4

Final answer = 1/2 × 1/2 × 1/4 = 1/16

4. Probability of B = 3/4

Final answer = 1/2 × 1/2 × 3/4 = 3/16

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