A couple who are both carriers of a recessively inherited gene has two children who both inherited the condition. 3/4 is the probability that their next child will be phenotypically normal. 1/4 has the chance of being diseased.
Inheritance is a mechanism by which the genes of parents pass down to their offspring. A gene "G" is dominant over "g," and Gg is the carrier for the disease but does not show the disease. If two parents are carriers (Gg) then there are two possible gametes from each that are G and g. Total four offsprings will be produced, out of four 3 are phenotypically normal and one is diseased. The punnett square is explained below.
Hence, 3/4 is the chance of producing a phenotypically normal child.
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