Introduction of additional copies of bovine beta and kappa casein into dairy cattle resulted in ____(A)____ increase in beta casein and ____(B)____ increase in kappa casein.

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The introduction of additional copies of bovine beta and kappa casein genes into dairy cattle leads to the production of transgenic cattle with altered milk composition.

This genetic modification results in an 8 - 20% increase in beta casein and a twofold increase in kappa casein in the milk. This change improves the physicochemical properties of the milk, making it more suitable for cheese production.

Answer: (A) 8 - 20 % (B) twofold

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