Three black puppies and one yellow puppy are formed from the cross of two black puppies. Hence the parents are heterozygous for Black. The genotype is Bb.
In a monohybrid cross, a single trait is involved, such as the skin color. The black skin colour of the puppy is dominant over the yellow. The black gene is represented by B and expressed in BB /Bb condition.
It shows complete dominance, which means the black is expressed in a heterozygous state. As three types of offspring are produced, the parents are heterozygote for the Black and show Bb genotype. The punnet square is explained in the image.
Hence, Bb is the genotype of the parent.
To learn more about the monohybrid cross, refer to the following link:
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