blood types to make a child?

Question

say the mother has a B+ and the father is A-

is it possible for one of their children to be O+

support for answer would be nice

Answer 1

Yes, it is possible. Type "O" is actually type "zero". A "B" mother could have the genes for B and O, the father could have the genes for A and O. "B" and "A" are dominant over "O", so each parent would express the dominant gene, but the child could inherit two "O" alleles and thus be genotype "OO", or blood type "O". Rh factor has simpler dominance. "+" is dominant over "-", so the mother could be genotype "+-". The father is genotype "--", so the kid would inherit a "-" from each parent, becoming genotype "--", or Rh type "-".

O- is possible.

Answer 2

Yes, both O+ and O- are possible. Here's why. [ Warning,
this is a long answer, but you did ask for support, right? ]

There is actually only one gene that determines whether your
type is A, B, AB or O. There are 3 possibilities, known as
"alleles", of how this single gene can turn out. Those 3 ways
are known as "A" or "B" or "O". A person gets a version of
this gene from each parent, for example, B from the mom
and O from the dad. The B version is called "dominant over"
the O version, so that a person with a B allele and an O
allele has type B blood. (A person with B allele from each
parent is also type B.)

If a person has one A version of the gene and one B verson
of the gene, neither is dominant over the other, and the
person is said to have AB type blood.
If a person has neither the A version of the gene nor the B
version, the person is said to have O type blood.

The + and - part is determined by another gene in our DNA,
and the + is dominant over - (Like A is dominant over O).
This is called the Rhesus blood system because this gene
was first observed in Rhesus monkeys.

We now know enough to answer your question. In order
for the new baby to have O+ blood type, both of its ABO
system alleles must be O. Can that happen? Yes; the B+
mother could have a B allele and an O allele and pass on
the O allele to the baby in the egg she produces. The A-
father could have an A allele and an O allele and pass on
the O allele to the baby in the sperm he produces. When
the sperm fertilizes that egg the result is an O type baby
because it has the O version (allele) of the gene twice.

Now for the "Rhesus" or + and - part of it. Recall that the +
is dominant over the -. So the baby's B+ mother could have
a + and another + for that gene, or have a + and a -. But,
either way, she DOES have a + to pass on to the baby in
her egg. The father of the baby, being A-, only can pass on
a - in his sperm because that's all he has.

Net result, the mom could make an O+ egg to go along
with an O- sperm, which would make an O+ baby.

Let's review why. The O from mom and the O from dad
clearly give the baby 2 O alleles for the ABO blood group
gene, which make the baby type O. The + from mom and
the - from dad for the Rhesus system make the baby +
because + is dominant over -. Net: O+

Two bits of terminology will be handy for you to know.
If you are talking about this at the "gene level" where you
specify the 2 gene alleles for the ABO system and the 2
gene alleles for the Rhesus +- system, that is called giving
the "genotype" of the person. Otherwise, if you factor in
all you know about dominant alleles, etc., then you are
giving the "phenotype" of the person by giving just the
resulting type.

So, if the mom has genotype BO++ or BO+- (which give
her phenotype B+), and the dad has genotype AO--
(giving him phenotype A-), Then the baby can get an egg
O+ and a sperm O- for a genotype OO+- which results in
a phenotype O+. So, yes, one of their children could be
O+ and in fact it is mathematically possible for all of their
children to be O+.

Can you figure out how B+ and A- could make an O- ?

Answer 3

The answer is yes. The postive/negative thing is separate to the blood type thing.
Here are the genotpyes and phenotypes for all blood types.
A blood type = AA or AO
B blood type = BB or BO
AB blood type = AB
O blood type =OO
To point out that A and B are both dominant alleles while O is recessive.

So if you have AO x BO
-------A--------O
B----AB------BO

O---AO-----OO

In this example there is a 25% chance the offspring will be A, B, AB or O......( so its a 25% chance of being O).
I really don;'t know much about the +/- rhesus thing, so I don't want ot put you wrong there.

Answer 4

Yes. There are three loci (places on the DNA - singular is locus): one that determines if you have A or not, one that determines if you have B or not, and one that determines if you're + or -. If you have at least one copy of the version of the gene (a shorter way of saying "version of the gene" is "allele") for A, you have the A in your blood type. If the mother has one copy of the B allele and one copy of the not-B allele, the child can get the not-B copy to go with a not-B copy from the father. Likewise for the father having a not-A copy. And the mother has a + allele, so it's there for the child to inherit.

Answer 5

hmm... there should be no complications like HDN (hemolytic disease of the newborn) due to incompatible rh (being positive or negative).

yes, there can be a possibility that the child will be O+ if the mother is AO postive and the father is BO negative.
A O
B AB BO
O AO OO

Answer 6

yea it would be possilbe for the baby to be O because if you draw a pedigree chart (one big square with four small squares within them) and label the top with A and O and the side of the other with B and O then mix and match and you can see the different kind of percentage that the baby could be..

Answer 7

Check this out. :) It has a little chart you can follow!

http://www.testsymptomsathome.com/GTI11_blood_type.asp

Edit: This one is even better...if you click on "blood type and Rh factor calculator" on the bar on the left, you can just enter the info and it'll calculate it for you!

http://www.biology.arizona.edu/Human_Bio/problem_sets/blood_types/Intro.html

Answer 8

Absolutely yes...

If mom's genotype is BO, ++ or +-

and

dad's genotype is AO, --

then OO;+- is a possible genotype for their offspring.

phenoytpe would be O+

Answer 9

dun think so.

a child will follow either his/her mother or father genetic material. so have to see which parent is the domain.
so
either
A-
B+
AB