In a cross of two f1-hybrid plants with purple flowers and round seeds (pprr), what fraction of the offspring should have purple flowers and round seeds (purple flowers and round seeds are the dominant traits)? in a cross of two f1-hybrid plants with purple flowers and round seeds (pprr), what fraction of the offspring should have purple flowers and round seeds (purple flowers and round seeds are the dominant traits)?
a. 9/16b. 1/12c. 1/16d. 3/16e. 12/16

1. a. 9/16 will have purple flowers and round seeds.

Explanation:

If purple flowers (P) and round seeds (R) are the dominant traits and both genes follow Mendel's principles, the cross between two heterozygous (PpRr) will  always produce the following proportions:

9/16 of both dominant traits (in this example, purple flowers, and round seeds)

3/16 of one dominant trait and one recessive (For example, non-purple flowers and round seeds)

9/16 of the other dominant trait and the other recessive one (purple flowers and non-round seeds)

1/16 of double recessive (non-purple flowers and round seeds).

In the attached Punnett Square is this cross, and it can be seen genotypic and phenotypic proportions.

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