00:02
In this question, we observe a female fruit fly that is x, x, y.
00:08
Okay.
00:10
And this female has white eyes.
00:18
And then we also are told, we're told that the father had red eyes and that the mother had white eyes.
00:47
Knowing that this as x linked to recessive, we are trying to figure out which parent and at which stage this chromosomal event occurred that caused this.
01:04
Well, i'm going to put a little dash next to these x's because we know that these are the excessive x's.
01:11
The father had to have a normal genotype, normal x, and the mother had to have two x's with the white gene on it.
01:20
Right.
01:22
Now, when you're going through myiosis, the father's x, y, will separate and you'll have an x and you'll have a y.
01:34
Well, did she receive that x? nope.
01:38
That was not passed.
01:43
She received that y.
01:45
So then let's look at the mother.
01:47
Normally a mother would give, create gametes, where the female would have one.
02:01
X, but something didn't happen right there.
02:08
So when we look at the stages of myosis, and we're going to go ahead and look at the mother, you go through prophase, metaphase, anaphase, telephase, and she's going to have two xs...