Answer:
Crossing over, independent assortment, and random fertilization all result in genetically diverse offspring.
During meiosis, which is split into 2 categories (Oocyte meiosis and spermatogenesis), a gamete undergoes a process like mitosis, however it occurs twice. A gamete starts out with twice as many chromosomes as a normal cell (It's a diploid), and before prophase I and metaphase I, crossing over occurs, "mixing up" genetic material. This adds diversity.
Independent assortment means that when a cell receives one allele, it does not influence the chances of getting another allele.
Example, in pea plants, if a cell were to receive a green(G) allele, there's still a 50/50 chance of it receiving either a green(G) allele, or a yellow(Y) allele.
Random fertilization increases the diversity even more. Females can produce a large amount of ova in their lifetime. After mating, the fact that the ova can have any combination of genetic material, and that there's over 40 million potential spermatozoa with different genetic material that could combine with it increases diversity.
(Very long, ik, sorry)
1).
Pink= Rw
Rw + Rw
R w
-------------
R| RR| Rw
w| Rw| ww
Red(RR): 25%
Pink(Rw): 50%
White(ww): 25%
2).
RR + ww
R R
-----------------
w| Rw| Rw|
w| Rw| Rw|
Red(RR) 0%
Pink(Rw) 100%
White(ww): 0%
3).
RR + Rw
R R
-----------------
R| RR| RR|
w| Rw| Rw|
Red(RR) 50%
Pink(Rw): 50%
White(ww): 0%
No, a red(RR) and pink(Rw) flower could not create a white(ww) flower. White is recessive, meaning 2 forms of the allele are needed for it to show. As red(RR) has no white(ww) alleles, there would be more pink(Rw) flowers. Two pinks(Rw), a pink(Rw) and white(ww), or two whites(ww) could create more white flowers though.