What are the chances of a A+ mum and a O+ dad having children, 4 O and 1 A+ ?

Question

five sisters only the youngest is A+ the others are O.

Answer 1

Do a simple Punnett square:

AO + OO= 50% AO and 50% OO

Simple genetics.  The percentages never change no matter how many AO children you get in a row.....it's biostatistics.

Answer 2

probable

Answer 3

Each time the same chance is 50 % of being either blood group. It makes no difference how many kids you have.

My dad has brown eyes ( his parents brown and blue), my mum has blue, which means statistically we have a 50% chance of having blue eyes, yet all five of me and my siblings have brown eyes.

Answer 4

The chances are very high.  Four of the children got the 0 gene, and one got the A gene.  Highly probable.

Answer 5

About as probable as Obama not nuking the US if he wins the election

Answer 6

It means the mom has a recessive O gene, and the dad has 2 o genes. So there is a 25% chance of each child being O. Which is unlikely to happen 4 times in a row, but definitely possible. The other 75% of chances it is A.

Answer 7

you have to take the grandparents blood groups too!

Answer 8

Well if the family has those blood types, the chances are 100% for them

:)

each kid had a 50% chance of being a or o

see:

mom is AO

dad is OO

so the combos would be:

AO

AO

OO

OO