Genetics pedigree (BMAT 2011 - No17)

Practice Question Solving
1

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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.
A.1and2only
B.1and3only
C.2and3only
D. 1,2and3
E.None of the above

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

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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.

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