00:01
Let's start with our monohybrid cross between two heterozygotes.
00:04
So we have big a little a by big a little a.
00:07
This is the resulting four possible offspring.
00:11
So our phenotype ratio is going to be three dominant.
00:15
So anywhere we have at least that one capital letter is going to give us the dominant phenotype.
00:21
And then the four square where we have two lowercase letters is going to give us the recessive phenotype.
00:28
Our genotype ratio is one to.
00:30
Two to one, one homozygous dominant to two heterozygotes to one homozygous recessive.
00:36
Now if we're looking for our diehybrid cross and we're using the probability method here, we just have to set up another punnet square with our bees here.
00:44
There's still heterozygotes, so we're going to get the same results.
00:47
And then our phenotype ratio for a heterozygous cross is nine to three to three to one.
00:56
So nine would be dominant for both traits...