Question

 A type B woman whose mother was type O marries a type O man. What is the genotypic ratios of their offspring?​

Answer 1

The genotype ratio of offspring will be 1:1 ( $i_{b}$$i_{o}$ : $i_{o} i_{o}$ )

Explanation:

• A type B woman whose Mother has type O blood group. woman's mother genotype is $i_{o} i_{o}$. so, the woman inherit one $i_{o}$ gene from her mother. So the genotype of the woman is $i_{b} i_{o}$.

• The man has O blood type so the man's genotype is  $i_{o} i_{o}$.

• so if type B woman marry type O man offspring will have type B and type O blood group. and genotype will be $i_{b} i_{o}$ and$i_{o} i_{o}$.

                                        $i_{o}$                  $i_{o}$

                            $i_{b}$       $i_{b}i_{o}$                $i_{b}i_{o}$              

                           

                            $i_{o}$      $i_{o}$$i_{o}$                $i_{o}$$i_{o}$

• so, the genotypic ratio will be 1:1