In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (W). The heterozygous genotype is expressed as pink. A pink-flowered plant (parent 1) is crossed with a white-flowered plant (parent 2). Parent's Genotype: parent 1 X parent 2

The genotype of the parents are:

Pink-flowered parent: Rr (heterozygous)

White-flowered plant: rr (true plant)

Explanation:

Incomplete dominance is the pattern of the inheritance where the dominant allele does not mask the effect of the recessive allele completely and results in a mix or blend of both alleles.

Similarly, here flower color is shows incomplete dominance which means Red flowers (RR) and white flowers (rr) where R is dominant over r. So, the pink color is a heterozygous condition that represents by Rr, a mix of both alleles.

Thus, the parent genotype are :

Rr - pink flower

rr - white flower

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!