Final answer:
In the cross between a purebred black bunny and a hybrid black bunny, only one phenotype, black, will be observed in the offspring, due to the dominance of the black allele over other possible colors.
Step-by-step explanation:
When crossing a purebred black bunny with a hybrid black bunny, we can use the principles of Mendelian genetics to determine the number of phenotypes. Assuming black color (B) is dominant over another color such as white (b), the purebred black bunny would have a genotype of BB, while the hybrid black bunny would have a genotype of Bb. Based on a simple monohybrid cross using a Punnett square, the possible genotypes of the offspring would be BB and Bb. Since both of these genotypes result in a black phenotype due to the dominance of the B allele, only one phenotype - black - would be observed amongst the offspring.
In this case, Mendel's two rules, the Law of Segregation and the Law of Independent Assortment, illustrate how alleles for a particular trait segregate during gamete formation and how different genes independently separate from one another.