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Monohybrid crosses with codominance

(1) Red (R) and white (W) coat colors in Shorthorn cattle are due to a pair of alleles which when heterozygous produce a roan coat color- where the number of red hairs are approximately equal to the number of white hairs. What proportion of the progeny from the cross roan x roan will be expected to be roan also?

(2) If a man with blood type B, one of whose parents had blood type O, marries a woman with blood type AB what percentage of their children would be expected to have blood type B?

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