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4.Principles of Inheritance and Variation
medium
$ABO$ blood grouping is controlled by gene I which has three alleles and show codominance. There are six genotypes. How many phenotypes in all are possible?
A
Six
B
Three
C
Four
D
Five
(AIPMT-2010)
Solution
(c) : The three alleles $I^A$, $I^B$ and $i$ of gene $I$ in $ABO$ blood group system can produce six different genotypes and four different phenotypes as shown below :
| Genotypes | Phenotypes |
|
$I^AI^B$ $I^Ai$ |
Blood group $A$ |
|
$I^BI^B$ $I^Bi$ |
Blood group $B$ |
| $I^AI^B$ | Blood group $AB$ |
| $i\ i$ | Blood group $O$ |
Standard 12
Biology
