00:01
Hi there, this question is regarding dihybrid cross.
00:05
So dihybrid cross here it is known as the inheritance of two genes.
00:12
So we can take capital y small y, capital r small r, capital y small y, capital r small r because both of them are heterozygous and we have to show a cross between two heterozygous individuals which are showing independent assortment during gamete formation.
00:34
So let us take the gametes.
00:36
So four types of gamete will be produced in each y r, y r, then capital y small r and finally small y small r.
00:49
Here also four types of gametes will be produced.
00:52
Okay.
00:53
This now we have to take a punnett square because it is the easiest way to determine what type of gametes will be produced, what type of individuals will be produced, not gametes.
01:15
So we will be requiring 16 small boxes.
01:22
Hence we can find out the ratio from the punnett square itself.
01:33
Almost completed.
01:34
And just one more line.
01:40
Done.
01:41
So let us write down the gametes first with blue.
01:45
So here y r.
01:49
Okay.
01:52
Like this, we have to proceed, we have to write all the gametes over here.
02:03
Now we have to write the combination.
02:09
We just have to see the combination and write it here.
02:12
This is how punnett square is utilized.
02:17
So this one is yellow, yellow seed and round seed.
02:25
Okay, round shape.
02:26
This one also yellow and round.
02:29
So let us just proceed this one.
02:55
So almost completed.
02:58
Now we have to take the phenotypic ratio only.
03:03
So it will be easier if we just write down the phenotypes over here.
03:08
So this one will be yellow round again, yellow round.
03:14
This is also yellow round...