Aplant breeder is trying to develop a deep purple violet. she knows the purple violets she has can be pp or pp for the purple color. she crosses two purple violets hoping to produce a deeper color. under what circumstances can she be sure that the resulting offspring will all be purple?

a. both parents must be pp.
b. both parents must be pp.
c. at least one parent must be pp.
d. at least one parent must be pp.

i thought it was a. both parents must be pp, but it was incorrect? can someone me find the correct answer and why it is the correct answer.

Option D

Explanation:

Given-

The alleles representing the purple violet color be represented by "P" and it is  easy to understand from the given facts that "P" is dominant over "p"

There fore both homozygous gamete "PP" and and heterozygous gamete"Pp"  represents the deeper purple color.

In order to have all the offspring of purple color , at least one of the parents must have PP genotype.

Let us say if one parent is for sure having"PP " genotype and other parent be any of the three i.e PP, Pp, pp genotypes are crossed together , then all the offspring will be purple in color.

Hence, option D is correct

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

read more on -

answer; i believe the correct answer is (data); /// good luck