Worth 20 points will mark 
read the following statements that describe what happens as an impulse travels. what is the correct order in which the steps occur?
1) the impulse continues to travel down the axon away from the cell body.
2) na+ gates close and k+ ions flow back out of the cell restoring the resting potential.
3) gated k+ and na+ channels are closed. the inside of the cell is slightly negative compared to the outside.
4) the neuron receives a stimulus great enough to start an impulse.
5) gated na+ channels open. the net movement of na+ ions into the cell produces the action potential.
a. 4,5,3,1,2
b. 1,5,3,4,2
c. 3,1,5,4,2
d. 3,4,5,1,2

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In a hypothetical breed of dogs, coat color is controlled by two genes. there are six different coat colors in this breed: black, brown, cream, gray, silver, and tan. consider the following crosses.cross 1: black females from a lineage of all black dogs are crossed with brown males from a lineage of all brown dogs. f1 males and females are all black. when f1 are intercrossed, f2 males and females are black or brown.cross 2: black females from a lineage of all black dogs are crossed with tan males from a lineage where all males are tan and all females are cream. f1 males are black, f1 females are gray. when f1 are intercrossed, f2 males and females are black, brown, gray, or tan.cross 3: silver females from a lineage where all females are silver and all males are gray are crossed with brown males from a lineage of all brown dogs. f1 males and females are all gray. when f1 are intercrossed, f2 males are black, brown, gray, or tan, f2 females are cream, gray, silver, or tan.select the correct statements regarding the mode of inheritance of the coat color genes.a) both genes are x-linked.b) both genes are autosomal.c) one of the genes modifies the expression of the other gene.d) each gene has an additive effect on the intensity of coat color.e) each gene independently specifies three colors.f) one of the genes is autosomal, and the other is x-linked.

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .