00:01
If there is a person that we are told is homozygous dominant at a certain gene, let's say the a gene, then that means they would have two dominant a alleles, so their genotype would look like this.
00:17
Now we can imagine someone who is homozygous recessive.
00:22
So that would mean a very similar thing.
00:24
That means that they have recessive alleles.
00:29
And the homozygous here, homo means same.
00:33
So if we're told that the alleles are recessive, that means both of them are recessive because they're both the same.
00:40
So homozygous recessive has two recessive alleles.
00:44
And then finally, our other option here is being heterozygous.
00:51
Now just like homo means same, hetero means something else.
00:56
Hetero means different.
00:59
So that means that our alleles are different.
01:01
So instead of being both dominant or both recessive, they'll have one of each, one dominant and one recessive.
01:06
So now that we have all of that down, we're gonna look at an example where we're told that someone who is homozygous dominant is going to be crossed with someone who is heterozygous.
01:21
So what that's gonna look like is homozygous dominant, we know two dominant alleles.
01:27
Homo, same, dominant, so they're both dominant.
01:33
Heterozygous, they're different, so one dominant and one recessive...