Question

ABO blood grouping is determined by three alleles. Possible genotypes and phenotypes are
A. 3, 1
B. 6, 4
C. 4, 6
D. 9, 7

Answer 1

Hint: Multiple allelism: the condition of having in excess of two alternative contrasting characters constrained by various alleles at a solitary hereditary locus. Multiple alleles is a kind of non-Mendelian inheritance pattern that includes something beyond the ordinary two alleles that generally code for a specific characteristic in a species.

Complete answer: ABO blood group in people is first found via Landsteiner. The fourth blood group, AB was found by de Castello and Stein. Bernstein indicated that these gatherings are constrained by three alleles – ${I^A}$,${I^B}$ and ${I^O}$/I. These alleles are autosomal and follow the Mendelian example of Inheritance. Alleles ${I^A}$, ${I^B}$ produce a marginally unique type of sugar while ${I^O}$ doesn't create any sugar. Since people are diploid creatures, every individual has any two of the three 'I' gene alleles. ${I^A}$ and ${I^B}$ are totally predominant over ${I^O}$, yet when ${I^A}$ and ${I^B}$ are available together, the two of them express their own sorts of sugar, consequently, carrying on as codominant alleles.

Along these lines, the right alternative '6,4'.

So, the correct answer is option B.

Note: With multiple alleles, that implies there are multiple phenotypes accessible relying upon the dominant or recessive alleles that are accessible in the characteristic and the dominance pattern the individual alleles follow when joined together.

The human ABO blood classification is a genuine case of multiple alleles. People can have red blood cells that are of type A (${I^A}$), type B (${I^B}$), or type O (I). These three distinct alleles can be consolidated in various manners observing Mendel's Laws of Inheritance. The subsequent genotypes make either type A, type B, type AB, or type O blood. Type A blood is a mix of either two A alleles (${I^A}$) or one A allele and one O allele (${I^A}$i). Also, type B blood is coded for by either two B alleles (${I^B}$) or one B allele and one O allele (${I^B}$i). Type O blood must be acquired with two recessive O alleles (ii).