nasledstvennie bolezni: xromosomnie i geneticheskie zabolevaniya
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tema : nasledstvennie bolezni: xromosomnie i geneticheskie zabolevaniya. zadacha 1: sindrom dauna svyazan s nalichiem dopolnitelnoy 21-y xromosomi (trisomiya). kakoe obshee kolichestvo xromosom budet u cheloveka s etim sindromom? reshenie: v norme u cheloveka 46 xromosom. pri trisomii 21-y pari dobavlyaetsya eshyo odna xromosoma. 46 + 1 = 47. otvet: 47 xromosom. zadacha 2: gemofiliya (xh) — retsessivnoe zabolevanie, stseplennoe s polom. zdorovaya jenshina (xx) vixodit zamuj za mujchinu s gemofiliey (xhy). kakova veroyatnost rojdeniya bolnoy gemofiliey docheri? reshenie: genotipi roditeley: xx × xhy. genotipi docherey: • xx (50%) — zdorova • xhx (50%) — nositelnitsa zabolevaniya otvet: veroyatnost rojdeniya bolnoy docheri = 0%. zadacha 3: albinizm (a) — retsessivnoe zabolevanie. geterozigot...
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