Refer to the family pedigree shown here. In generation 1 one parent is affected by the gene mutation and one parent isnt. I generation 2 all three children are affected by the gene mutation. What can you conclude about this gene mutation?

Question

Refer to the family pedigree shown here. In generation 1 one parent is affected by the gene mutation and one parent isnt. I  generation 2 all three children are affected by the gene mutation. What can you conclude about this gene mutation?

Anonymous · Answer

The gene is dominant and the one parent is homozygous for the gene.

PsyDAG · Answer

No pedigree shown. Cannot copy and paste here.

Unclear, but it it seems like the gene mutation is dominant. By affected, I assume that you means that it shows up in the phenotype. The chances of all three children inheriting the mutation is 1/2^3 = 1/2*1/2*1/2 = 1/8.