If Both Parents Are Blood Type a Positive the Baby Will Be Blood Type

No it doesn't. Neither of your parents has to have the aforementioned blood type as you.

For case if one of your parents was AB+ and the other was O+, they could only have A and B kids. In other words, most probable none of their kids would share either parent's claret type.

And that's just 1 of many possibilities. There are lots of other possible combinations where two parents without blood type A can have a kid with one. Here they are:

Parent 1	Parent 2
AB	AB
AB	B
AB	O

Now as to the positive part, that adds even more possibilities. Here is a table that I retrieve goes through all the possible combinations where an A+ person would have a different blood type from his or her parents:

Parent one	Parent 2
AB+	AB+
AB+	AB-
AB+	A-
AB+	B+
AB+	B-
AB+	O+
AB+	O-
AB-	O+
AB-	B+
B+	A-

So in that location you have it. At least x different combinations of parents without an A+ claret type can give an A+ blood blazon.

Before moving on, it is probably important to mention that at that place may be rare exceptions where an A+ child can come up from parents with a different combination than ane of these. Take a look through our previous answers on blood type to see how this might happen.

What I thought I'd practice for the rest of the reply is focus on why these combinations can all requite an A+ blood type. Equally you'll come across information technology has to practise with two different genes and the different versions they come up in.

Alphabet Soup: How A, B, and O are Unlike

Beginning let's get over a little bit about what it means to exist A positive.

Claret cells naturally have lots of different sugars on their surfaces. The sugars that doctors look at to determine one part of your blood grouping come up in iii flavors – "A," "B," or "O."

As you might have guessed, the A flavour makes the A sugar, and the B 1 makes the B sugar. Information technology turns out that the O flavour doesn't make any sugar.

Your blood type is adamant past which combination of sugars you lot take. And this is determined by the genes yous get from your parents.

Two Copies of Each Gene, I from Each Parent

Dna is a set of instructions for making and running a living thing. So your Dna is the set of instructions for making and running yous.

A lot of these instructions are found in long stretches of DNA chosen genes. Each gene has the instructions for i small function of you.

One of these genes goes by the name ABO. It comes in iii flavors, or "alleles" —A, B, and O. Your blood type is adamant by the combination of alleles of this gene you lot get from your parents.

When you lot inherit a gene, you normally get two copies, i from your female biological parent and one from your male one. What this means for the ABO factor is that you can just have 2 of the three alleles of the ABO gene. The post-obit chart shows yous the different combinations that are possible:

Combination

A + A

A + O

A + B

B + B

B + O

O + O

Now hither's the part that'southward a little complicated. When we talk nigh someone's blood type, nosotros care less about the gene combinations, and more near what they're able to make. For example, someone that's "AO" will be type A, because the O flavour of the cistron makes no sugar. This person only has the A sugar.

Here are the blood types associated with each of the combinations of alleles:

Combination	Blood Blazon
A + A	A
A + O	A
A + B	AB
B + B	B
B + O	B
O + O	O

As you can see, even though there are 6 different allele combinations, there are simply 4 dissimilar blood types.

At present nosotros have everything we demand in society to explain how two parents without an A blood type might have a child with the A blood type. Hither is an example of one of the ways we talked about in the get-go section:

In this example, your female biological parent is AB and your male one is O. Remember we only go i of one parent'south two copies and one of the other parent's.

In this case, 1 gave y'all an "A" and the other gave you an "O," and then you lot'd be "AO." This ways you are the A blood type.

(I thought it would exist important to mention that not every family looks like the family in this example – you may have two dads or two moms, who had you with the help of a donor. However, you lot would get your blood type from your female person biological parent and your male person biological parent.)

Another Factor Determines Positive/Negative

So at present I know what y'all're thinking – you're A positive, so what does the "positive" part mean?  It turns out there'due south another important molecule on blood cells called the Rh protein.

You either have the Rh protein or you lot don't. If you lot have it, y'all're positive, and if y'all don't, yous're negative.

As with the ABO sugars, 1 gene controls your Rh type. This cistron comes in either a "working" form – meaning it makes Rh protein – or a grade that makes no poly peptide at all.

For you to exist A positive, y'all must have inherited at least one working copy of the Rh gene from ane of your parents. All the same, we don't know for sure if one or both of your parents is Rh positive.

Instead of drawing out every combination of ABO and Rh, beneath is one case of how yous might be A positive with neither of your parents being the same blood blazon every bit you:

Here, the female person biological parent is AB negative and the male is O positive. The female has an A allele and a B allele for her ABO gene, and two negatives for her RH gene. The male person has two O alleles of the ABO cistron, and a positive allele and a negative allele of the RH factor.

In this case, the female happened to pass an A and a negative, and the male an O and a positive. So you are "AO +/-" genetically, pregnant you have an A+ blood blazon.

Nosotros hope you enjoyed learning about blood types! If yous're all the same curious about blood types, including how and why the body doesn't accept claret that doesn't expect like its own, check outthis useful link.

riddleshaterecer.blogspot.com

Source: https://www.thetech.org/ask-a-geneticist/blood-type-can-be-different-parents