13. Mendelian Genetics
Mendel's Experiments
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In this video we're going to talk about the generations of Mendel's plants. And so Gregor Mendel standardized the naming system of generations to track inheritance patterns. And so really there are 3 generations that you all should be familiar with. And the very first generation is the parental generation. And the parental generation generation is commonly abbreviated as the p generation. And so this, of course, is going to be the original set of individual plants that are mated or the parents, if you will. Now the 2nd generation that you all should know is the 1st filial generation or in other words, the f one generation. And so the 1st filial generation or the f one generation is going to be the offspring of the p generation. And of course, the word filial is a word that's related to child. And so you of course, this is going to be the children of the parental generation. And then, of course, last but not least here, we have the 2nd filial generation or the f 2 generation. And this is going to be the offspring of the f one generation plants. And so let's take a look at our image down below to get a better idea of these generations. And so notice here in our first block, we're showing you the p generation, which is going to be the original set of parents that are mated. And so here what we have is a homozygous dominant pea plant being crossed with a homozygous recessive pea plant. And so, of course, when you set up their gametes on a Punnett square, like what you see here, you set up their gametes on the Punnett square and you fill in the punnet square, what you're going to get are heterozygous individuals in each of these punnet squares. In each of these squares, it's representing a heterozygous genotype. And so the individuals that are inside of this Punnett square represent the f one generation. And so that leads us straight down to this next part here. The f one generation, of course, is gonna be the 1st filial generation, the children of the parental generation. And, of course, because these, offspring, these children of the parental generation are all heterozygous, Of course, we're looking at heterozygous here. And so here we could either cross, fertilize a single heterozygous or, I'm sorry, self fertilize a single heterozygous or we could cross fertilize 2 heterozygous. Either way, we're going to have the heterozygous alleles of the gametes across the top. And when we fill this in, what we will have is this right here. We will have 1 homozygous dominant, 2 heterozygous, and 1 homozygous recessive, and these are the possibilities of the offspring. So these squares within here represent the f 2 generation, and that leads us to the next, square that we have down here. The f 2 generation is going to be, as you can see here, 3 3 of the 4 possibilities are going to be, yellow. So you can see these three possibilities here are yellow. And one of the possibilities of the f two generation here would be green. And so, the generations are just referred to as p generation, f 1 generation, or f 2 generation. And so this here concludes our introduction to the generations of Mendel's plants, the p, f 1, and f 2 generations, and we'll be able to get some practice applying this as we move forward in our course. So I'll see you all in our next video.
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