Answer: The genotypes of the F1 generation are BbTt and Bbtt.
The probability of having a genotype BbTt is 1/2
The probability of having a genotype Bbtt is 1/2.
The phenotypes of the F1 generation are black trotter (BbTt) and black pacer (Bbtt)
The probability of having a black trotter is 1/2
The probability of having a black pacer is 1/2
Explanation: From the information provided, the genotype of a homozygous black pacer is BBtt while the genotype of a homozygous chestnut, heterozygous trotter is bbTt.
A dihybrid cross between BBtt and bbTt will produce sixteen offsprings in F1 generation. The genotypes of the F1 offsprings is 8 BbTt and 8 Bbtt.
The probability of having a BbTt genotype is 8/16 =1/2
The probability of having a Bbtt genotype is 8/16 = 1/2
The genotype BbTt is heterozygous black, heterozygous trotter.
The genotype Bbtt is heterozygous black, homozygous pacer.
The phenotypes of the F1 offsprings are black trotter and black pacer.
The probability of having a black trotter is 8/16 = 1/2
The probability of having a black pacer is 8/16 = 1/2.