monohybrid cross
The DNA of all humans is essentially identical and allows breeding, despite a difference in the continental origin of the parents.
a human
inbreeding
Inbreeding
Inbreeding!
homozygous
Geneticists use the Punnett square to predict the outcome of a particular breeding experiment. They predict the potential genotypes of the offspring of two parents with known genotypes.
Offspring of true-breeding parents are called F2 generation. This is often seen in hybrid breeding programs when they are working to produce a certain trait.
Inbreeding is the mating of closely related parents whereas hybridization is the breeding of quite different parents just closely enough related to produce offspring.
Breeding is just breeding any pair of parents together to get offspring, whereas selected breeding is choosing a certain set of parents and targeting a few specific traits you want the offspring to have, such as fur length, coloration, or body shape.
The DNA of all humans is essentially identical and allows breeding, despite a difference in the continental origin of the parents.
hybrids
a human
Depends on what you mean by "can". Physically they certainly can, but they shouldn't be allowed to. If they have the same parents it doesn't matter if they're from different litters, they're still brother and sister. And breeding from such close relatives just isn't healthy.
In breeding, the "line" is the ancestry of the animal. Its parents, grandparents, and even great-grandparents are all part of the line.
inbreeding
Referring to organisms for which sexual reproduction produces offspring with inherited traits identical to those of the parents. The organisms are homozygous for the characteristics under consideration.