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Medical genetics question: Should the older parent come before the younger parent?

Genecks
in Genetics

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Imagine I'm making a pedigree

 

In (I)

[] = daddy :) (born 1978)

() = mommy (born 1983)

 

In (II)

[] = son (first born child)

() = daughter (second child)

 

I..[]--()

......|...

......|...

II.[]--()

 

Or does it not matter which parent was born first?

 

I..()--[]

......|...

......|...

II.[]--()

Where possible, the male should be placed on the left of a mating line. Then children are placed in order of birth.

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