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DIT genetics
Question | Answer |
---|---|
what is the probability that a femal heterozygous for an X linked disease will pass it on to her son? | 50% |
what is the probability that a female heterozygous for an X liked disease that mates with a normal male will have a carrier daughter? | 50% |
what is the probability that a female carrier of an x linked disease will have a child with that disease assuming she mates with a normal male? | 25% |
Both males and female are affected with a disease in every generation. | autosomal dominant |
a/w floppy mitral valve, dissecting aortic aneurysm, berry aneurysm | Marfan's |
a/w mitral valve prolapse, liver disease, berry aneurysm | ADPKD |
hemangiomas of retina/cerebellum/medulla | VHL |
increased MCHC, hemolytic anemia | hereditary spherocytosis |
cafe au lait spots and soft tissue growths | NF I |
macroorchidism and autism | fragile X |
endocardial cushion defects are common | Down's |
recurrent pulmonary infections, steatorrhea | CF |
multiple fractures, easily confused with child abuse | osteogenesis imperfecta |
a/w alzheimer's after age 35 | Down's |
prone to bilateral acoustic schwannomas | NF II |
excess fibroo fatty tissue deposits amongst muscle | muscular dystrophy |
used to dx CF | Cl sweat test |
defective gene in CF? | CFTR |
southern blot | DNA: DNA |
northern blot | RNA: DNA |
western blot | protein: Ab |
accumulation of GM2ganglioside | tay sachs |
a/w renal failure | fabry |
accumulation of dermatin sulfate | Hurler, Hunter, Scheie |
deficiency in hexosaminidase | tay sachs |
2 pts have the same mutation but different phenotypic expressions. One got the mutation from the dad, the other from the mom. What's this called? | imprinting |