00:01
In order to consider this question, i talk about inheritance.
00:03
Question six says, considering four -gene loxite, what is the probability that an individual with a genotype that is hetero -sigal for a, hydrhydrous for b, heterocytes for b, heterotene, for d, will produce a gamete that has a genotype a, b, c, and d.
00:18
So you want this gamete.
00:21
You want this gamete, okay? so, first, remember that when you have a monohybrid cross or only one gene, you have two alids, two possibilities for the gamut.
00:32
Okay because you have two allele so you have two gamins.
00:36
If you have two genes and you have this, then you're going to have four possible gametes because you're going to cross this one with this one, this one, this one, this one, this a with this b, and this a with this a, so you're going to have four.
00:49
In case you have three genes, you're going to have a total of a possible gametes.
00:57
So as you can see here, you are just increasing the number like, for example here you had two.
01:03
Now when you have two genes, you're going to have four, when you have three genes, you're going to have a.
01:08
Okay, so when you have four genes, you're going to have here two, two, two, two, and two, you have a total of 16 possibilities.
01:18
This is the total.
01:19
In order of these 16, so many of them are going to be abcd, well, only one that is what, that is when you get this a with this b with this c and with this d.
01:28
Okay, so only one in 16.
01:31
This is going to be the probability to get this gamut here.
01:34
So this is the answer for question six.
01:36
Now level for question seven.
01:38
In question seven, it says consider a tetra hybrid cross, okay, when you have a practically this cross and the same genotype practically here.
01:55
What is the probability that offspring will be homocylusominant for all for three? so you want this genotype here.
02:04
You want this genotype.
02:05
Okay.
02:05
So as you can see here, you're going to cross all of them.
02:08
Instead of making a panel of the square that is very big, you're going to make for monohyroid panel squares, you're going to cross this heterocygous a with this heterosegous a, this heterocyg with this heterocyg with this heterocyg with this heterocyg.
02:22
And also this heterosegous g, and also this heterosegous d for this hydrosegrocyg.
02:25
As you can see here, you're crossing a heterocygous here with another heterocygous.
02:30
So it doesn't matter, like, which of them, but all of them are going to have the same proportion in the panel square.
02:36
So let's use the letter m, okay? you're going to have one heterocygios ig with the heterocygousum here.
02:43
This is the general representation of what our crosses here are going to look like.
02:48
So you're going to have here homozygos dominant, gilocygoyles, hippeotigos, and homozygos recessive.
02:55
So these are going to be the proportions.
02:57
Now you want homozygos for a, homozygos for b, homozygousous for c, and femoseiglox dominant for d.
03:03
So imagine this instead of m, this is a.
03:07
You have four possibilities.
03:09
In one of those four possibilities, how many of them are going to be homozygousous dominant for a? you have that only one.
03:13
So you have one part.
03:15
Then for b, you just have to imagine that instead of m you have b.
03:19
And out of these four possibilities for the a, for the b cross, how many of them are going to be homocego nominal? you have only one quarter.
03:27
So, and well, the same you have for c and for d.
03:30
You want to get also one quarter and one quarter because they have the same, they are the same cross between a hydrocygo with another heterocygos, so that proportion is not going to change.
03:38
So you will have to multiply this and you're going to get 16 by 16.
03:41
This is going to be 1 divided by 2xx.
03:43
So this is the answer for question number seven.
03:46
Now i go for question number eight.
03:48
That says, if a tetra hybrid is test crossed, okay? it means cross to homozygly excessive individual.
03:53
What is the probability that a phenotypically recessive individual offspring will be produced? so you're going to have this cross here.
04:00
Chirozygos, chytotogos, and g3torzygos.
04:03
And you're going to cross this with a homozygotlygo greciative for a four genes...