00:01
Okay, this question here says in cats and x -linked pair of alleles a control color of four, the alleles are incompletely dominant.
00:09
The dominant produces black and the recessive produces yellow and a hybrid produces a tortoiseshell color.
00:14
So in case of females, you have that the homozygous dominant are going to produce black, the homozygous recessive is going to produce yellow, and the heterozygous is going to produce tortoiseshell.
00:33
In case of males, they have only one x chromosome, so they can be either black or yellow.
00:44
They cannot be, or normally they cannot be, tortoiseshell.
00:47
Now, it says, set up a legend in which the genotype with respect to gender of each possible cat fur color is identified.
00:56
So i have already done that.
00:57
It says give the cat fur color, or give the cat fur color is also x -linked.
01:04
Would it be possible for a male cat to receive the hybrid coloration? and the answer is no.
01:09
Because in this case, as i told you before, in order to produce the hybrid coloration that is tortoiseshell, you need two x alleles.
01:17
In this case, males only have one x allele, so they cannot be tortoiseshell.
01:22
Then it says, a yellow cat had a litter of two tortoiseshell kittens and one yellow kitten.
01:29
What is the gender of the yellow kitten? so in this case, you have a yellow cat that is female, obviously.
01:34
So in this case, you have the mother here, and here you have the father.
01:39
But you don't know the genotype of the father.
01:41
And it says that he had a litter of two tortoiseshell kittens.
01:48
It means one tortoiseshell here, well, two tortoiseshell.
01:53
And it actually doesn't matter how many of them you have.
01:57
Two tortoiseshell kittens and one yellow kitten.
02:02
So you have one yellow kitten here that can be like this or like this, because you don't know the sex of this.
02:10
So you just have this.
02:12
And it says, what is the gender of that yellow kitten? so you have to remember that a cat inherits one allele from each parent.
02:19
Or well, in general, an offspring inherits one allele from each parent.
02:22
So in this case, for example, this recessive b, or well, this dominant b can come from the mother...