Someone who is 25% mosaic for a mutation has had which of the following occur during...
Someone who is 25% mosaic for a mutation has had which of the following occur during their fertilization/development:
a) A germline mutation before fertilization
b) A somatic mutation before fertilization
c) A germline mutation after fertilization
d) A somatic mutation after fertilization
Homework Answers
d) A somatic mutation after fertilization
Since the individual displays the mutation in a mosaic, only 25% of cells are affected, and these cells are somatic. Since a mutation before fertilization would lead to all cells displaying that characteristic, the mutation is post-fertilization.
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