if my mum and sisters are Rhesus O negative and i am O posative, what should my father be???

Answer 1

Your father should be O positive as well

Specifically, your father's genotype with respect to Rhesus status would be Dd - heterozygote - because if your sisters are dd they would need to get a "little-d" from father.

(Assuming he is the father of your sisters)

and if you are Dd (you should get at least one "little-d" because your mother is Rh negative) you must have gotten the "big-D" from your father. Hence he would have Dd genotype.

Answer 2

For the Rhesus Factor there is a dominant gene and a recessive gene, so the pattern of inheritance is just like any other factor. This means that your father could be either rhesus positive with one positive gene or rhesus negative with 2 recessive genes. For the ABO system there are three alleles. Two of them are co-dominant and the other is recessive.Since there are 4 different maternal blood types and 4 different paternal blood types possible, there are 16 different combinations to consider when predicting the blood type of children. Your dad could thus be either be A,B or O.

Answer 3

Dunno but work this out, both my parent's have THE SAME BLOOD GROUP as each other & it's different to mine!!!!! How kookie is that, partic when they only discovered this after 39yrs of marrage when I mentioned mine (O Rhesus +) & Mum said "Oh you must get that from your father cos I'm A Rhesus-" & Dad sadi "Oh, no, I'm A - as well"

Answer 4

he can be either 0 neg or 0 pos

Answer 5

someone who fathered a kid cheating on their biology homework.