Предмет: Биология, автор: Кристина000Кристина

Цепь молекулы ДНК до мутации состояла из такой последовательности остатков нуклеотидов: ААА ААТ ТГГ ЦАГ ТТГ. После мутации она приобрела такой вид: ААА ААТ ТГГ ЦАТ ТТГ. Сравнив структуру молекулы ДНК до и после мутации, найдите триплет, подвергшийся изменению.Определите строение полипептидов, которые кодировала цепь ДНК до и после мутации.Сделайте выводы.

Ответы

Автор ответа: Loskut
0

ААА-ААТ-ТГГ-ЦАГ-ТТГ - до мутации

 

фен-лей-тре-вал-асн (последовательность аминокислот в полипептиде до мутации)

 

 

ААА-ААТ-ТГГ-ЦАТ-ТТГ - после мутации

 

фен-лей-тре-вал-асн(последовательность аминокислот в полипептиде после мутации)

 

Как видно ,в результате случайной замены гуанилового нуклеотида в триплете ЦАГ на тимидиловый ( то есть мутировавший триплет имеет вид ЦАТ) изменения строения полипептида не последовало ,т.к  оба триплета ЦАГ и ЦАТ кодируют одну и ту же аминокислоту.

 

 

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