3. Assuming that such a fruit fly (Drosophila) would be...

3. Assuming that such a fruit fly (Drosophila) would be viable, what would be the sex of a fruit fly with the following chromosomal composition? A. One X chromosome and two sets of autosomes. (1 point) B. Two X chromosomes, one Y chromosome, and two sets of autosomes. (1 point) D. Two X chromosomes and four set of autosomes. (1 points) E. Four X chromosomes, two Y chromosomes, and four sets of autosomes. (1 point)

Transcript

00:01 Okay, in order to answer this question, we have to talk about the x in a graintyo.

00:09 Okay, that is practically the number of x chromosomes and the number of autosomes radio.

00:15 Okay, this is going to be useful to determine the sex of this drosophila species.

00:24 Remember that this is the number of x chromosomes and the sets of autosomes.

00:28 Normally, it is going to be a normal female, a normal female.

00:35 Male when the ratio is going to be one.

00:38 It means, for example, if you have this 4x in these autosomes, you have 4 divided by 4, and this is going to be 1.

00:47 This is one means that it's going to be a normal female.

00:51 This is one example.

00:52 And in case of males, the ratio has to be 0 .5.

00:57 So for example, if you have a normal male, you have a 0 .5 of grade ratio.

01:04 For example, it is going to be xy.

01:08 In xy, you have only one x chromosome, and let's suppose you have two autosomes.

01:13 So you're going to have one divided by two.

01:18 You have two autosomes, and this is going to be 0 .5.

01:22 0 .5 is going to be degraded for normal.

01:24 Okay? so the question says, it says, first, if it has one chromosome and two sets of autochromes, it has only one x chromosome and two heads of autosome.

01:42 We're going to have 1 divided by 2.

01:45 And this is going to be 0 .5.

01:48 So it is going to be a male.

01:51 And this male is going to be sterile...

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