Blue eye colour in human is recessive to brown eye colour. The expected children of a marriage between blue-eyed woman and brown-eyed male who had a blue-eyed mother are likely to be :-

all blue-eyed

three-forth of them blue-eyed and one-forth of them brown-eyed

all brown-eyed

all blue-eyed or all brown-eyed

Blue eye colour is recessive to brown eye colour.
A brown eyed man whose mother was blue eyed marries a blue eyed woman.
The children shall be both blue eyed and brown eyed 1:1. The brown eyed man will have the genotype Bb and his wife bb. Hence Bb x bb = Bb: bb. Hence, the ratio is 1 : 1.

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