Final answer:
The probable offspring phenotypes from a cross between parents that are both Hh (dominant for short hair over long hair) are: short hair (HH or Hh), long hair (hh), or heterozygous short hair (Hh).
Step-by-step explanation:
In a cross between two rabbits that are both Hh (short hair allele is dominant over long hair allele), there are three possible phenotypes for the offspring: short hair (HH or Hh), long hair (hh), or heterozygous short hair (Hh).
The Punnett square can be used to determine the genotypes and phenotypes of the offspring. A Punnett square for this cross would have two rows and two columns. The possible genotypes in the square would be HH, Hh, Hh, and hh. Therefore, there is a 25% chance of getting homozygous short hair (HH), a 50% chance of getting heterozygous short hair (Hh), and a 25% chance of getting homozygous long hair (hh).