Blood problemsBlood problems

24. For the following indicate whether it is possible for the blood type to be created based on the couple's blood types

Parent 1 Parent 2 Child Possible? - explanation

A A O

A AB O

O B AB  

AB AB A  

A + A = O?A + A = O?

A or O

 A -

A AA A -

A or O- A - - -

OO?

A + AB = O?A + AB = O?

 A B

A    

A or O-    

OO?

O + B = AB?O + B = AB?

B or O

 B -

O    

AB?

AB + AB = A?AB + AB = A?

 A B

A    

B    

A?

25. Determine the 25. Determine the possible blood typespossible blood types that could that could be foundbe found in the children of a couple who are AB Rh- in the children of a couple who are AB Rh- (AB Rh- Rh-) and O Rh+. (Trick) (AB Rh- Rh-) and O Rh+. (Trick)

AB Rh-Rh- x OO Rh+__?

Is it OO Rh+Rh+?

Is it OO Rh+Rh-?

Do both!

AB Rh-Rh- x OO Rh+Rh+

  O Rh+

A Rh- AO Rh+Rh- A positve

B Rh- BO Rh+Rh- B positive

AB Rh-Rh- x OO Rh+Rh-

  O Rh+ ORh-

A Rh-  

B Rh-    

Okay….Okay….

So answer the question. What was So answer the question. What was that again?that again?

The possible blood types that the couple’s children are:

26. Determine the possible blood types of any 26. Determine the possible blood types of any childrenchildren when a woman with when a woman with type A bloodtype A blood whose parents whose parents werewere both AB Rh- marries a man who is type O Rh- both AB Rh- marries a man who is type O Rh- and and hadhad a type B Rh+ child from a previous a type B Rh+ child from a previous marriage.marriage. (Trick) (Trick)

  A Rh- B Rh-

A Rh-  

B Rh-    

Woman’s genotype?

What about the man’s What about the man’s genotype?genotype?

What is he again? What is he again? O Rh-O Rh-

That’s recessive for both traits. That’s recessive for both traits. There’s only one genotype possible:There’s only one genotype possible: OO Rh-Rh-OO Rh-Rh-

Umm…what was the Umm…what was the question?question?

 O Rh-

A Rh-  

(What could the blood type could their children have?)

Dad

Mom

Sex-linked TraitsSex-linked Traits

Normal male: XBY

Male with colour blindness: XbY

Normal female: XBXB

Female with colour blindness: XbXb

Female who is a carrier: XBXb

Colour blindness

31. Determine the possiblity of having a31. Determine the possiblity of having a childchild who is colour blind if a colour blind who is colour blind if a colour blind woman marries a man who had a colourwoman marries a man who had a colour blind father.blind father.

XbXb x __Y?

Is it XBY?

Is it XbY?

Do both!

XbXb x XBY

  XB Y

Xb XBXb XbY

XbXb x XbY

  Xb Y

Xb XbXb XbY

……Just check the question Just check the question alreadyalready

3 in 4.3 in 4.

32. Determine the possiblity of two colour32. Determine the possiblity of two colour

blind people having a normal colourblind people having a normal colour

vision child.vision child.

Why does that sound familiar?

Oh yeah, we did that already.

Answer: _________

33. Determine the possiblity of two parents33. Determine the possiblity of two parents

who each had a colour blind mother ofwho each had a colour blind mother of

having a colour blind child.having a colour blind child.

• Gotta find the genotype of the two parents first,

then I can see what their offspring are like.

• They have a colour blind mother, but what about

the father? There are two possibililties.

Woman:Woman:

  XB Y

Xb XBXb XbY

  Xb Y

Xb XbXb XbY

Mother colour blind, father normal

Mother and father both colour blind

50% of the girls are colour blind

Man:Man:

  XB Y

Xb XBXb XbY

  Xb Y

Xb XbXb XbY

Mother colour blind, father normal

Mother and father both colour blind

100% of the boys are colour blind

The answer is that there is a 50% The answer is that there is a 50% chancechance

that these parents could have a colourthat these parents could have a colour

blind child.blind child.

Gene FrequencyGene Frequency

Refers to how common a gene is in a Refers to how common a gene is in a populationpopulation

Take a look at the table in your Take a look at the table in your handouthandout

GroupGroup AA BB ABAB OO

USA – whiteUSA – white 41.041.0 10.10.00

4.04.0 45.045.0

USA – negroUSA – negro 2626 21.21.00

3.73.7 49.349.3

SwedishSwedish 46.746.7 10.10.33

5.15.1 37.937.9

JapaneseJapanese 38.438.4 21.21.88

8.68.6 31.231.2

HawaiianHawaiian 60.860.8 2.22.2 0.50.5 36.536.5

ChineseChinese 25.025.0 35.35.00

10.10.00

30.030.0

Aborigine (Australian)Aborigine (Australian) 44.744.7 2.12.1 00 53.153.1

North American North American IndianIndian

7.77.7 1.01.0 00 91.291.2

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