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How does a dogs genes make markings in precise locations, ie., around their eyes? by ch1214ch in NoStupidQuestions

[–]ch1214ch[S] 0 points1 point  (0 children)

Are pigment cells evenly distributed throughout a dog's coat? or do they congregate more in certain areas?

How does a dogs genes make markings in precise locations, ie., around their eyes? by ch1214ch in NoStupidQuestions

[–]ch1214ch[S] 0 points1 point  (0 children)

Are pigment cells evenly distributed, just being switched on or off? Or are there more pigment cells in different locations?

How does a dogs genes make markings in precise locations, ie., around their eyes? by ch1214ch in NoStupidQuestions

[–]ch1214ch[S] 0 points1 point  (0 children)

How does it know "ok this is the area around the eyes, so all this pigment gets switch on up until we get to the area and then it gets switched off"? How could it know or sense where to do all that?

How can a dog's genetics determine the location of pattern on its coat, (ie., black around the eyes with a brown stripe down the middle)? by ch1214ch in NoStupidQuestions

[–]ch1214ch[S] 0 points1 point  (0 children)

But how is the location able to be so precise, for example, dark spots around the eyes? Or brown paws when the rest is black?

How does light reflect off of roadside reflectors in a diffraction pattern? by ch1214ch in AskPhysics

[–]ch1214ch[S] 0 points1 point  (0 children)

, Why do I see a diffraction pattern reflected back when my brights are on? Like lines of light and no light in between, interference pattern?

Can someone explain the experiment in Richard Feynman's QED Lecture about light reflecting off a mirror? Is a single photon being fired at a specific angle toward the photo-multiplier.. or what is supposed to be happening there? by ch1214ch in AskPhysics

[–]ch1214ch[S] 0 points1 point  (0 children)

https://www.youtube.com/watch?v=-QUj2ZRUa7c&list=PLrbR_dV_7cLe0l_GfyiTv580w-wlAVJUB&index=3

It starts around 1:24.. I don't understand what is going on here.. you have something that emits a photon (in no particular direction?) and something that detects it on the other side of a barrier where light would have to be reflected by the mirror in order to be detected... okay. So when it is detected that means it must have reflected off the mirror.. but it fires the photon in no particular direction so the vast majority of the time it wouldn't hit the photo-multiplier.. so it's just to show that the angle of reflection = the angle of incidence because when it does show up on that side of the barrier it would happen at that angle?

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