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Jack has the genotype Nn IBi (trans configuration) and Jill has the genotype Nn IAi (cis...

Jack has the genotype Nn IBi (trans configuration) and Jill has the genotype Nn IAi (cis configuration). What is the chance that their child inherits normal nails and type A blood?

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Answer #1

We assume that there is no crossing-over taken place & genes are completely linked.

As Jack has genotype in trans configuration, his genotype will be- & possible gametes will be Ni & nIB

As Jill has genotype in cis configuration, her genotype will be- & possible gametes will be NIA & ni

So, the cross will be-        X      

Gametes NIA ni
Ni NN IAi Nn ii
nIB Nn IAIB nn IBi

Now, if their child inherits normal nails and type A blood, then only possible genotype will be- NN IAi

So, the probability will be 1/4 or 0.25.

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