A hybrid is something that is a combination of two
normally different things. So, for example, a
hybrid car is a car with an engine that burns
gasoline like a normal gasoline-burning car, but
in the process the hybrid car also charges a
super-powerful battery that it can run on when the
engine is turned off. This allows the car to be
A hybrid organism is a hybrid between two
types. These can be subspecies, like the
breeds of dog, or sometimes entire species, such
as a mule being a hybrid between a horse and a
donkey. Hybrids are created by
interbreeding; a mule has one parent who is
a horse, the other who is a donkey, and so being
the child of two different species, the mule has
aspects of both.
Plants do this too: for example, a
pluot is a hybrid between a plum and an
apricot. The pollen came from a tree of one
species, but the ovule (plant egg, basically) came
Purebreds refer specifically to breeds,
where an individual is a member of a specific
breed of what-have-you. Nectarines are a breed of
peach. A hybrid between the more common subspecies
of peach (which has hairy skin) and a nectarine
would not be purebread.
Non-disjunction does not ensure that there will
be differences in traits between generations.
Non-disjunction is a mishap whereby the
chromosomes do not split during cell division
that creates spores (plants) or gametes (animals).
When non-disjunction happens, it usually causes
problems in the offspring . For example,
Down Syndrome in humans is caused by
non-disjunction of chromosome #21 , resulting
in a child having three copies of the chromosome
in each cell, instead of the usual two copies.
Children who afflicted by this are sterile, suffer
mental retardation, and other problems.
What you are probably thinking of is
segregation. Segregation (in biology,
not politics) refers to the fact that alleles do
not blend into each-other, so even if you are
not expressing a genetic trait, you can still pass
it to your offspring.