How is the Rh factor inherited? How is the Rh factor inherited in humans?

AnnaMalia

06.08.2009, 18:27

Mom and Kiklan

06.08.2009, 18:35

From what I read, I realized that the negative ones have only negative ones.

06.08.2009, 19:18

No.
positive ones can have a negative child, but negative ones cannot have a positive child

06.08.2009, 20:28

The child's Rh may be incorrectly determined, and so can the parents.

06.08.2009, 21:55

If Rhesus has the same mechanism as the group, then it can. you need to ask the geneticists

Mom and Kiklan

06.08.2009, 22:17

maybe, why not? why only in one direction, please explain, or provide a link. Let’s say the parents are Rh+ Rh+, and the child is Rh- this same Rh that got lost along the way?

Try using a search engine, I just looked at the Rhesus inheritance table, there, negative people are inherited 100%.

06.08.2009, 22:30

found it.
Patterns of inheritance of blood group and Rh factor.

Inheritance of blood type is controlled by an autosomal gene. The locus of this gene is designated by the letter I, and its three alleles by the letters A, B and 0. Alleles A and B are equally dominant, and allele 0 is recessive to both of them. There are four blood types. The following genotypes correspond to them:

First (I) 00

Second (II) AA; A0

Third (III) BB; B0

Fourth (IV) AB

Example 1:

The husband has a second blood group and is homozygous (AA)

Wife 00 + husband AA

Gametes: 0 0 A A

Child: A0 A0 A0 A0

All children have a second blood group and are heterozygotes for this trait.

Example 2:
wife has blood type O (00)

The husband has a second blood group and is heterozygous (A0)

Wife 00 + husband A0

Gametes: 0 0 A 0

Child: A0 A0 00 00

In a given family, in 50% of cases it is possible to have a child with the second blood group, and in 50% of cases the birth of a child with the first blood group.

Rh factor inheritance
encoded by three pairs of genes and occurs regardless of blood type inheritance. The most significant gene is designated by the Latin letter D. It can be dominant - D, or recessive - d. The genotype of a Rh-positive person can be homozygous - DD, or heterozygous - Dd. The genotype of a Rh negative person may be dd.

Example 1:

The husband has a positive Rh factor and is heterozygous (Dd)

Wife dd + husband Dd

Gametes: d d D d

Child: Dd Dd dd dd

In a given family, the probability of having a Rh-positive child is 50% and the probability of having a Rh-negative child is also 50%.

Example 2:
wife has a negative Rh factor (dd)

The husband has a positive Rh factor and is homozygous for this trait (DD)

Wife dd + husband DD

Gametes: d d D D

Child: Dd Dd Dd Dd

In this family, the probability of having a Rh-positive child is 100%.

I continue the topic.


gametes D d D d
children DD+, Dd+, Dd+ and dd -

I don't pretend to be true.

06.08.2009, 22:54

Maybe. I have IV-, my husband has I-. I thought that children could only be in denial. She gave birth to her second child in the 1st birth period (Rhesus-conflict) and there all children have their blood type determined at birth. Imagine my surprise when it turned out that the child had II+. (I’m sure of my husband’s paternity :))) I asked the doctor why such a group turned out, maybe the analysis was mixed up? I was told that this could happen. Now I want to find out the blood type of my eldest son. Maybe not like my mother or my father either :)

06.08.2009, 23:00

Maybe. I have IV-, my husband has I-.
I thought that children could only be in denial. She gave birth to her second child in the 1st birth period (Rhesus-conflict) and there all children have their blood type determined at birth. Imagine my surprise when it turned out that the child had II+. (I am sure of my husband’s paternity:)))
I asked the doctor why such a group turned out, maybe the analysis was mixed up?
I was told that this could happen.
Now I want to find out the blood type of my eldest son. Maybe not like my mother or my father either :)
If your child was Rh-conflicted, then he was positive. This was confirmed. This means that my husband’s Rh is incorrectly determined.
Only “negative” women have “conflict” children.
Well, you know better about paternity. ;):) Most likely, my husband’s Rh was incorrectly determined. May bi cross reaction...
Well, we solved all the problems a page earlier.

AnnaMalia

06.08.2009, 23:16

She calmed the parents down and sent everyone to re-donate blood.

Kirillova-mother

07.08.2009, 14:43

found it.
[
I continue the topic.
examples not previously considered.
3. wife with Rh positive heterozygote Dd and husband with positive heterozygote Dd
gametes D d D d
children DD+, Dd+, Dd+ and dd -

4. well, dd and dd (both negative parents) cannot have either heterozygous Dd or homozygous DD positive children, only dd-, dd-, dd-, dd-.:(
because here there are only zygotes d d d d

5. Dd is positive. one parent + DD pos. other = all positive homo DD DD and hetero Dd Dd children

6. DD+ and DD+ - positive parents = only homozygous positive DD DD DD DD children.

Maybe there are pitfalls?
I don't pretend to be true.

When I was pregnant, my husband and I also read something like this. My daughter was born - there’s no way there’s a group like hers! (According to the table:).) The husband came to the doctors, stamped his feet - “you defined it incorrectly, redefine it immediately!” They drove him away with the words “go, young man, everything is correct, and this also happens.”
Pys. This is OUR daughter. No options.

07.08.2009, 17:13

07.08.2009, 18:15

I'll tell you too. Having become pregnant, I went for a test to determine the gr. blood. I always knew that I had 1-, and that’s what it says on the certificate from the maternity hospital (when I was born). According to the results of the residential complex: 1+. I had to retake it again in another place - the same thing. I called my mom: she did too, to which my mom shouted down the phone: just don’t tell dad (there was no reason, but he’s very suspicious - “first he hits, then he sorts it out” :)). My mother donated blood again, she also became a +, then my dad was prepared and his blood was donated - he also turned out to be a +. So for 25 years my family was all “-”, and during my pregnancy everyone became “+”. Let me note that my dad donated blood several times when he was young, and was always “-”, just like my mother’s. Same. No one received transfusions.

07.08.2009, 19:32

Well, it's simple!
Rh negative parents can only have Rh negative rhe.
About 80% of the human population has the Rh antigen (conventionally called Rh-positive). But others do not (Rh-negative). If neither mom nor dad has this antigen, where does it come from? all the stories when Rh-positive children are born to Rh-negative parents are most likely an error in determining the parents' Rh or Rh.

07.08.2009, 22:32

About homo and heterozygotes, I think I know more than you.




:009:

Genetics is a science. This is not fortune telling on coffee grounds!

07.08.2009, 22:41

Well, what I know, only I know;)
and in categorical things it is not permissible to write IMHO, IMHO... You write bookish truths.
Okay, I'm gone:020:

Dasha-Petya

07.08.2009, 23:07

Still, I’ll correct myself... I wrote some nonsense at first.
There is a variant of a “weak” Rh factor, when laboratory errors are very likely. They can determine “-” rhesus, when in fact it is “weak”, but “+”. Then there is a possibility of having a child with “+”.

07.08.2009, 23:31

09.08.2009, 18:51

About homo and heterozygotes, I think I know more than you.
Rhesus antigen is dominant. That is. if it is, in any case the Rh will be positive.
RhRh-homozygous. Rh-positive
Rhrh-heterozygote.Rh-positive.
rhrh- and only in this case is Rh negative.
:009:
IMHO about eyes and skin color: characteristics such as hair, skin and eye color are encoded NOT BY ONE GEN, but by a combination of several.
Genetics is a science. This is not fortune telling on coffee grounds.!}