If two parents who's blood types are both B produce a child that has blood type O, what can you say about the parent's genotypes?
A. one is ii
B. one is IBi
C. both are IBi
D. nothing, this is impossible
isnt this C?
Since Jiskha doesn't have a biology expert at this time, please try posting your question at this site.
http://www.biology-online.org/biology-forum/
It is indeed C. Both would have toe be IBi!
To determine the genotypes of the parents, we need to understand how blood types are inherited. Blood type is determined by the presence or absence of certain antigens (proteins) on the surface of red blood cells. There are four blood types: A, B, AB, and O, which are determined by the presence or absence of A and B antigens.
In this case, both parents have blood type B. Blood type B can be produced by two possible genotypes: either homozygous genotype BB or heterozygous genotype IB. Since both parents have blood type B, it is possible that both parents have the heterozygous genotype IB.
Now, let's consider the child's blood type, which is type O. Blood type O is produced by the genotype ii, which means the child has both alleles for the O blood type. It is important to note that the O blood type is recessive to both the A and B blood types.
Given that both parents have blood type B and their child has blood type O, we can conclude that both parents must have the heterozygous genotype IBi. This means that one allele carries the instruction for producing the B antigen, and the other allele carries no instruction, resulting in the O blood type.
Therefore, the correct answer is C. Both parents are most likely to have the IBi genotype.