Only Q13 I am not able to do that one

Dear student,
13)
a) The mismatched genotype is X Y which is present in 23rd pair of chromosome.

b) The X chromosome will be inherited from the mother irrespective of boy or girl.

c) Braying is dominant over silent , let us represent Braying as B and silent as b.
Erect ears are dominant over drooping , let us represent Erect ears as E and silent as e.


Given that Braying donkey with drooping ears crossed with silent donkey with erect ears.
Genotype will be : BBee X bbEE
Gametes will be B , E and b ,E.
F1 generation will have a genotype of BbEe , thus it will Braying donkey with erect ears.


Now , if it is crossed to a same Braying donkey with erect ears,
 
Gametes BE   Be bE be
BE BBEE BBEe BbEE BbEe
Be BBEe BBee BbEe Bbee
bE BbEE BbEe bbEE bbEe
be BbEe BBee bbEe bbee


Thus Phenotypic ratio 9:3:3:1
Braying and erect ears : 9 donkeys
Braying and drooping ears : 3 donkeys
Silent and erect ears : 3 donkeys
Silent and drooping ears : 1 donkey


Hope this information will clear your doubts about topic.

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Regards

 

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