BLooD TYPES?

Question

could two people with the O blood type make a child with A blood type?
could two people with A blood type make a child with O blood type?
why?
thanks!

Answer 1

Technically, the first question should be yes, although the possibility is ridiculously slight - the O alleles result from a single base pair deletion from A alleles, so if the exact addition took place to restore the allele to being an A allele in one of the parents' gametes, two O type parents could have a child with type A blood.

Under normal circumstances, though, since O alleles are recessive, O type parents would have to have two O alleles, and therefore all their children would have O type blood.

Two people with A type blood may have the allele combination AO, since O is recessive and A is dominant. Therefore, if the O alleles from each parent combined, the child could be genotype OO, and therefore be O phenotype.

Answer 2

First Question:
No, they can't. O blood type is made by the joining of two recessive genes (ii). If the P1 generation has O blood type, they are both homozygous for O. That means that their offspring will obviously have O blood type. There isn't any other choice because the idea that they are homozygous automatically determines the blood type the kids will have. They can't have A, B, or AB.

Second Question:
Yes, they can. The reason is because A is a dominant gene. A person can be heterozygous by having Ai. The A will obviously show up, and even though the "i" trait will remain hidden, the person will be a carrier. The carrier can still pass down that particular trait to its offspring, though. You said two people, so if two carriers plan to have a baby, their child will have a 25% chance of having O blood type. The parents MUST both be heterozygous (carriers of "i") if their blood type is A, though. They can't be homozygous for the trait because if they are, there is no chance of the child having O blood type.


Hope this was helpful! Good luck!

Answer 3

People with type O blood could not make a child with A blood. Blood type has two alleles, and O is recessive, so the parents would both have OO blood, therefore producing only children with type O blood.

Two people with type A blood could have a child with type O blood. The two possible alleles for type A blood are AA and AO. If both parents have AO, then they could both pass the O allele onto their offspring, producing a child with type O blood.

Answer 4

No, two people with the O blood type could not produce a child with A blood type. Since O blood type is homozygous recessive O is the only possible result.
Yes, two people with with A blood type could produce a child with O blood type if the parents are both heterozygous AO. AO x AO could produce a child with the blood type O (25% chance) or a child with type A (75% chance)

Answer 5

First question: No, because O blood types have the homozygous of O recessive genes, therefore they do not have the A genes to make a child with A blood type
Second question: Yes, because A blood types are dominant. A could have the recessive genes of O. So, if both parents have dominant A and recessive O they could have a child with O blood type.

Answer 6

Two people with O type blood can only produce O type offspring, since it is the recessive trait. However, people with A type blood could possibly produce O type offspring. People with A type blood could have the phenotype AA or Ao, and the only way they could produce a child with O type blood is if both parents were Ao (or Bo, or a combination of the two, but you only spoke of A type).

Answer 7

Two people with type O blood cannot have a child with type A blood.

Two people with type A blood can have a child with type O blood.

explanation: in the gene that determines our blood type, there are two alleles (this is like a half gene that we get from each parent to form our own unique gene)

the allele that is for type A is dominant, whereas the allele that is for type O is recessive. If you have type O blood, it means that you have two recessive allelles and therefore, it's the only thing you can pass to your child.

If you have type A blood, you could eithier have two dominant alleles, or one of each. If both parents had one of each allele, they would have a 25% chance of having a type O child.

Answer 8

No - type O is recessive

Yes - if they are each heterozygous