Jack's mom has , which runs in their family. Testing revealed that Jack's mom is a carrier of a BRCA1 mutation (Chapter 16, p. 535, Hartwell et al., 6th edition). This mutation increases the risk of breast and ovarian cancer. As a carrier, there's a 50% chance that Jack inherited the mutated gene.
References: Hartwell, L. H., Hood, L., Plunckett, W., Scott, M. P., Goldfarb, M. P., & Zipursky, S. L. (2019). Genetics: From Genes to Genomes (6th ed.). McGraw-Hill Education. genetics from genes to genomes hartwell 6th edition pdf
The HTT gene mutation in Emma's family is an example of a , caused by a single gene mutation (Chapter 4, Hartwell et al., 6th edition). In contrast, breast cancer is a complex disease , influenced by multiple genetic and environmental factors (Chapter 16, Hartwell et al., 6th edition). Jack's mom has , which runs in their family
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