00:01
Okay, i want to answer this question, let's talk about a monohyroid cross.
00:04
Let's suppose you have a homocylus dominant, that is this gyotype here, okay? homoseigal dominant because you have two dominant allele's.
00:11
And you cross this with a homozygris excessive organism that is like this.
00:16
Okay? so you don't even make, you don't even need to make a pan in the square, but let's do it anyway.
00:22
You're going to find this in here.
00:25
You're going to get that.
00:26
The only possibility here from this cross is going to be to get heterocygous off, so this is going to represent all the f1.
00:33
So in all the f1 you're going to get only this genotype.
00:37
Obviously here this is a monohybrid cross because we have only one gene that is the a gene.
00:43
Okay, and this a gene has two like versions, the dominant aline, the dominant a and the recessive a.
00:50
So this is going to be the f1.
00:52
So practically here your phenotype ratio, for example, it's going to be 4 to 0.
00:58
Now, in order to get the f2, the f2, 2, you have to cross this heterocygous with another heterocygous that also comes from this cross.
01:07
So you're going to have this.
01:10
Now you have to make up a square, you're going to get this.
01:16
You're going to have here a homozygous dominant, heterozygos, heterocygous and homozygous okay? so as you can see here, remember that in case of complete dominance, complete dominance, it means that this is going to be completely dominant over this.
01:38
This a, it means in the genotype, whenever you find the dominant dalil, you're going to express a dominant phenotype.
01:44
And when you don't have the dominant alil, it means when you have two recessive all, you're going to express the recessive phenotype...