Quote:
Originally Posted by swimintheundertow
The only reason I ask is because it is fairly common in my family. I mean I found one but it's tiny and I'm more than sure that it'll go away. If it doesnt I'll ask my biology teacher. I was kind of more curious for later in life seeing how my grandma had breast cancer twice, my uncle had a brain tumor and my aint died from cancer when she was like 27.
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not sure about the brain cancer but . . . .
if you know that specifically ovarian and breast cancer run in the family then it is is hereidtary and you have a brca 1 gene mutation for it. it's neither recessive or dominnat in some cases and just happens.
If brain cancer runs in the family then genes that trigger these things are influenced by more than one chromosome and some may be mendelian traits. in which cases it's not necessarily heriditary but you get it because of things in the environment.