00:01
So we're going to look at the distance between a couple of genes, but we're starting with an f1 generation where the f1 generation is heterozygous at these two genes.
00:09
So one dominant, one recessive at both genes.
00:12
And then we're going to cross them with someone who is homozygous recessive at both genes.
00:17
Now, there's a couple of different examples on your worksheet it looks like, and they both start with the same pattern of one heterozygous individual crossed with a homozygous recessive.
00:26
So then when we look at the f2 generation, it's going to work for both.
00:31
So when you want to know the distance between genes or which ones are recommit, things like that, you always want to start by listing them in order from the most common to the least.
00:39
So in this example, the most common phenotype of our f2 generation has both dominant traits.
00:45
Next most common, 897, you have both recessive traits.
00:49
And then you just go down the line listing them in this order.
00:55
And once you've done that, i can show you why.
00:58
And that's because you should see that there are two different phenotypes in this f2 generation who are way more common than the other possible phenotypes.
01:06
You see, these are around 900, whereas the others are more around 100...