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4.Principles of Inheritance and Variation
medium
$A$ woman is married for the second time. Her first husband was $ABO$ blood type $A,$ and her child by that marriage was type $O.$ Her new husband is type $B$ and their child is type $A B$.
What is the women's $ABO$ genotype and blood type?
A
$I^{A} I^{O} ;$ Blood type $A$
B
$I^{A} I^{B} ;$ Blood type $AB$
C
$I^{B} I^{O} ;$ Blood type $B$
D
$I^{O} I^{O} ;$ Blood type $O$
Solution
Blood groups are inherited from our biological parents in the same way as eye colour and other genetic traits. Within the $ABO$ blood group system, the $A$ and $B$ genes are codominant, $i.e.,$ these will be expressed whenever the gene is present. The $O$ gene is silent and only expressed when neither $A$ nor $B$ is present
Std 12
Biology
