Genetics pedigree (BMAT 2011 - No17)

Genetics pedigree 1Have a question you need some help solving? Ask them here!
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The genetic condition represented by the shading is caused by the presence of at least one
allele for the condition.

U Which of the following are possible reasons why U has the condition?

1.The condition is dominant.
2.The sperm from T carried the allele for the condition. 3.A mutation present in a egg of S.
D. 1,2and3
E.None of the above

Is mutation necessary to cause an allele when the father has already carried one.

They’re not asking what is necessary just all the possibilities why they can have the disease. So the mother could have had a mutation in the egg cell to pass to the daughter. Because it COULD be dominant or recessive.