11) purple flowers are dominant to white flowers in the jimsonweed plant. when a particular purple-flowered jimsonweed is self-pollinated, there are 28 purple-flowered and 10 white-flowered plants in the f1 generation. what are the genotypes of the parents? what is the phenotypic and genotypic ratio of the f1 generation

a) Genotypes of the parents - Pp

b) Phenotypic ratio -

c) genotypic ration -

Explanation:

It is given that 28 purple and 10 white flowered plants are produced in first generation.

Thus, genotype of the parents could be

Pp X Pp

As only then offspring with genotype PP, Pp, Pp, pp will be produced.

Thus, the phenotypic ratio would as PP, Pp Pp are purple flowered plant while pp is white flowered plant.

Genotypic ration would be PP:Pp:pp

a) Genotypes of the parents - Pp

b) Phenotypic ratio -

c) genotypic ration -

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.  

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the electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, x-rays, and gamma-rays.