<span>Just as you've laid it out in your question. There is 1 YY (the only seed that will breed true for Yellow). There are 2 Yy, which are Y, but will not breed true for yellow, and there's 1 yy (which I'm guessing is green, and will only breed true for that color. Since that seed won't be included in with the seeds that are yellow, there are only 3 to choose from. </span>
<span>So that's a total of 3 yellow seeds, and out of those 3, only one is YY (true breeding for yellow) Your chance of picking up one seed and having it be YY (true breeding for yellow) is 1 in 3, or 33.3%</span>
It is part of our nervous system and uses stimuli to respond to an event that is happening. The five senses are motor receptors making you move your muscles to respond to that event that is happending