GN 301 Lecture Notes - Lecture 10: Rett Syndrome, Learning Disability, Hypertrichosis
Document Summary
Sequential hermaphroditism (constantly changing: corn, monoecious: both type of sex flowers found on one plant, silk (pistil) is female part and tassel (makes pollen) is male part. Single gene mutations can cause one flower to not develop at all. A bee that comes from fertilization and is heterozygous for sex gene becomes female. Sex determination in organisms with x and y chromosome. Sex chromosomes: protenor mode of sex determination, xx for one sex and xo for another sex, diff. Number of chromosomes: ex: grasshoppers, lygaeus mode of sex determination, xx vs xy, xx is homogametic and xy is heterogametic, y chromosome has sex determining region. X chromosome normally codes for androgen receptors, but here it is mutated so there is no response to hormone. 5 alpha reductive enzymes which do not convert testosterone to active form properly. Only found in one location in the world. Missing enzyme causes androgen production by adrenal glands.
