Gardener purchased 20 full-grown pea plants. all 20 were the same genotype and had purple flowers. the gardener crossed two of these plants to get seeds for the next season. the seeds from the cross produced some plants with purple flowers and some with white flowers. the gardener learned that in pea plants the allele for purple flowers (p) is dominant of the allele for white flowers (p). what was the most likely genotype of the original 20 full-grown plants?

"Pp" is the most likely genotype of the original 20 full-grown plants

Explanation:

Given

All the 20 full-grown pea plants have purple flowers.

But when two plants out of these 20 are mated , then the seeds from the cross produced some plants with purple flowers and some with white flowers

This leads to a conclusion that though the 20 plants have purple color , they must be carrier of white color allele.

Thus, genotype of all the 20 pea plant species would be "Pp"

if two "Pp" genotype plants are crossed following offsprings are produced -

Pp

PPPPp

pPppp

Since "p" is a recessive allele , therefore when two recessive alleles are together they express their trait.

So, here in this case one out of four offspring is white in color.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c