02-20-2015, 02:19 PM
I understood the 25% but not the 50%. It was a cognition/english issue. thanks cardio and this question: https://books.google.com/books?id=ZM1bAw...&q&f=false
Here's how it works: lets make a punnett square
Mom [A1A2]xDad[A3A4]= Child with 25% chance of getting any one of 4 possibilities: A1A3, A1A4, A2A3 OR A2A4.
if i am A2A4:
1. What is the chance that my sibling is also A2A4 ie what is the chance that my sibling has the same 2 haplotypes as me? ANS: 25% [perfect match]
2. What is the chance that my sibling doesnt have any A2 haplotype nor any A4 haplotype? well that means they can only have A1A3 and prob of that is 25%. [no match]
3. What is the chance that my sibling has either A2 or A4 in common with me? prob of them having A2 but not A4 [ie prob of A2A3]=25% prob of them having A4 but not A2 [prob of A1A4] = 25%. there fore we add the two prob 25+25=50%. [half match. this is the point i didnt understand]
Here's how it works: lets make a punnett square
Mom [A1A2]xDad[A3A4]= Child with 25% chance of getting any one of 4 possibilities: A1A3, A1A4, A2A3 OR A2A4.
if i am A2A4:
1. What is the chance that my sibling is also A2A4 ie what is the chance that my sibling has the same 2 haplotypes as me? ANS: 25% [perfect match]
2. What is the chance that my sibling doesnt have any A2 haplotype nor any A4 haplotype? well that means they can only have A1A3 and prob of that is 25%. [no match]
3. What is the chance that my sibling has either A2 or A4 in common with me? prob of them having A2 but not A4 [ie prob of A2A3]=25% prob of them having A4 but not A2 [prob of A1A4] = 25%. there fore we add the two prob 25+25=50%. [half match. this is the point i didnt understand]