For a, I dont know if in Y-linked, two unaffected parents can have an affecected

Question

For a, I dont know if in Y-linked, two unaffected parents can have an affecected son. I know it can happen in Autosomal Recessive.

For b, i want to say its not autosomal dominant because it's only males that are affected and it should be both males and females. Also, half the offspring of the affected parent should be affected as well and thats not the case here.

i dont know c.

2 2 6 3 4 IV 1 a. Is the trait Y-linked? Why or why not? b. If this trait is autosomal dominant, how can you explain individual II-5? c. If this trait is RARE, why is an autosomal recessive mode of inheritance UNLIKELY?

Explanation / Answer

A) Trait is not Y linked because if it was Y linked then in generation II every male would have been affected because their father is affected but only one male child is affected.

B) We think that II-5 has to be affected because if it is autosomal dominant then how can two unaffected produce affected progenies. Actually the reason is incomplete penetrance of the genes and that is why II-5 is unaffected.

C) Autosomal recessive is unlikely in case of rare trait because recessive traits can not be seen in every generation and in this case it can be seen in each generation. That is why it is unlikely

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