Exercício de Probabilidade em Genética
Exercício:
A fibrose cística é uma doença autossômica recessiva grave. É caracterizada por um distúrbio nas secreções das glândulas exócrinas que pode afetar todo o organismo, frequentemente levando a morte prematura. As pessoas nas quais o alelo recessivo é detectado recebem aconselhamento genético a respeito do risco de vir a ter um descendente com a doença. Paulo descobriu que é heterozigoto para essa característica. Ele é casado com Júlia, que não apresenta a doença e é filha de pais que também não apresentam a doença. No entanto, Júlia já teve um irmão que morreu na infância, vítima de fibrose cística.
Qual a probabilidade de que Paulo e Júlia venham a ter um(a) filho(a) com fibrose cística?
a) 1/6
b) 1/8
c) 1/4
d) 1/2
e) 1/3
Informações Adicionais:
O Gabarito é a alternativa “A”, porém só alcancei o resultado da alternativa “B” e não sei onde errei.
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