The nonmutant allele of the brca1 gene to suppress tumor formation in women who are heterozygous for the mutation. women heterozygous for brca1 nevertheless have a 50% to 70% chance of developing breast cancer before age 70, and the usual reason is that the nonmutant allele is lost or inactivated in a lineage of cells. one possible mechanism for such "loss of heterozygosity" is:
a. germ cells in the affected individual develop a mutation in the nonmutant allele of brcal.
b. a somatic mutation in a breast cell inactivates the nonmutant brca1 allele.
c. a silent mutation occurs in the nonmutant brca1 allele.

Option B

Explanation:

A silent mutation has no effect on the gene activity and function hence option C is incorrect. Germ cells would affect the gametes produced, not the body's proteins hence the answer would be B.

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answer: collecting information/data

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the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.