No, guinea pigs and possums can't be crossed. Guinea pigs are Eutherians while possums are marsupials. Species as far apart as these simply can't be crossed.
A test cross with a homozygous recessive guinea pig (bb) would reveal the genotype of the black guinea pig. If all offspring are black, then the black guinea pig is most likely homozygous dominant (BB). If both black and white offspring are produced, then the black guinea pig is likely heterozygous (Bb).
A hybrid guinea pig is a guinea pig that is not a pure bred. Its mother may be a abyssian and its father may be a texel. purebreds parents are the same (mom and dad are both texel).
white
I don't think it exists :p
Cross between homozygous black rough (BBRR) guinea pig and homozgous white smooth guinea pig (bbrr) produced black and rough animals in F1 generation.
They probably won't let you because your guinea pig might be carrying a disease that you do not know of.
It is spelled "guinea pig". You got it right! :)
Well, there isn't one main cross. Two guinea pigs I had (one was short haired and the other one was long haired) gave birth to three guinea pigs. Two were short haired and the other was long haired. Hope I helped!
I don't have a guinea pig.
guinea pig
Guinea pig's parents:)
A Guinea Pig..