a true breeding white mouse and a true breeding black mouse were crossed. All of their offspring were white. Which trait is dominant and which trait is recessive?

A true breeding white mouse and a true breeding black mouse were crossed. All of their offspring were white. Which trait is dominant and which trait is recessive?

WW x bb = Wb, Wb, Wb, Wb

The trait that is dominant is the white mouse while the black mouse is recessive, Since after crossing all the offspring are white it reflects that the white mouse remains dominant all through.

WW = White mouse Homozygous dominant

bb = Black mouse Homozygous recessive

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