new_n_lost
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A.1:2
If a Rh-negative woman conceives a child with a Rh-positive partner, the potential exists for the child to inherit its father's Rh-positive blood type. There are two types of Rh-positive men. In 55% of individuals, the man is heterozygous. In this situation, his genetics allow him to produce Rh-negative offspring 50% of the time and Rh-positive offspring the remaining 50% of the time. In the second type of a Rh-positive individual, only Rh-positive offspring can result, a condition known as the homozygous state.
http://www.med.unc.edu/obgyn/direct/rh.htm
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| new_n_lost
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Rh blood type of the father (55% of Rh-positive men are genetically heterozygous for the Rh antigen and, therefore, produce Rh-negative offspring when mating with Rh-negative women 50% of the time.)
http://www.emedicine.com/emerg/topic507.htm
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| me007
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he is a heterozigous Rh+
Wouldn't it decrease that 1:2?
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| new_n_lost
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Well i maybe wrong but thats all i cud think of
Anyone Else plz Elaborate !!!!!
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| me007
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looks like 50/50, you are right
similar to AR triat.
50% offsprings will have that allele.
1:2
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| indidoc1
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Guys.. i think the answer is C 1:8
The Q very clearly asks.. "probability that ALL THREE of their children are Rh positive is-"
The probability of each child being Rh+ is 1:2
But if we take all 3 prob together, we have to multiply the probabilities..
So, 1/2 * 1/2 * 1/2 = 1/8
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| indidoc1
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BTW, this is a genetics q, not immuno 
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| rock
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agree with indidoc...its c...that is 1:8. this is a probability question
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| new_n_lost
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Agree with Indi
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| kashdoc21
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in genetics probability is equal for each offspring ..it is a heterozygous male and would have 1: 2 probability that offspring will be affected
ans is 1:2
please post the right ans????
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| Jackofknives
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Probability for RH- is ½. Shouldnt be misunderstood as, if you conceive a child that is RH-, does NOT mean the next one will be 100% RH+, that is false logic. I think this is what you meant.
Therefore, the chance for each single child to become RH- is ½.
Child #2 is also ½.
Child #3 is also ½.
I forgot the math term for this kind of calculation. But it's ½^3 = 1/8
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| lq2006
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probability FOR ALL THREE of their children are Rh positive is 0.125 (1:8)
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