Cats can have long tails (LL) or have no tail, which is called a bob tail cat (NN).  The intermediate tail length, medium, is a result of the heterozygous condition. Cross a long tail cat with a medium tail cat.  Give the genotype and phenotype percentages. 

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explanation:

if you know the fur color of the offspring mice, you can use the ratios to identify the genotypes of the parents.

if either parent mouse passes a dominant allele, the offspring will have black fur.

if the parental mice has two different fur color (i.e white and black) , the color of the offspring's fur would be either black, white, or the combination of both (grey)

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the contamination

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