Question

What is the genotype of a white mouse?

Answer 1

Answer: Black is dominant = B White is recessive = b A black mouse could be BB or Bb. If you cross a black mouse (bb = double recessive) with a black mouse Bb or Bb then if BB the offspring will all be black (Bb). ... This is called a test cross - using a recessive to determine the genotype of a dominant phenotype.

Answer 2

In mice black fur is dominant over white fur. Predict the genotype and phenotype of a cross between a purebred black furred mouse with a purebred white furred mouse. 2nd take the other parent and write their genotype letters along the top of the boxes.