1. In a series of two-point mapping crosses involving five...

1. In a series of two-point mapping crosses involving five genes located on chromosome II in hop beetles, the following single crossover frequencies were observed. h-g 29% h-cv 13% h-t 21% h-y 6% g-y 35% g-t 8% g-cv 16% cv-y 19% cv-t 8% t-y 27% A. Given that g maps near the end of the chromosome, construct a map of these genes. -----gene ?-----------gene?-----------gene?-----------gene?-----------gene?-----end of chromosome B. In another set of experiments, a sixth gene, z, was tested against y and h. The following results were obtained: z-y yielded 17% recombinants and z-h yielded 23% recombinants. What is the map distance between z and t?

Transcript

00:01 So we're starting with information about the recombination percentage between genes.

00:07 So g and y are experienced 35 % recombination, which means they are 35 map units apart.

00:14 H and y 6%, so they're 6 map units apart.

00:18 G and h 29 map units apart and so on.

00:22 So i'm going to use this list of the different genes, how far apart they are, to make a gene map.

00:30 And the way that we like to do this is to start by finding the farthest distance apart.

00:37 And in this case it is g to y.

00:39 We want to find the farthest apart because that gives us two ends.

00:42 It's like putting down the bookends before you put everything in the middle.

00:46 So we're going to put g on one end, y on the other, it doesn't matter which is which.

00:51 And we're going to say that they are 35 map units apart.

00:57 So then you'll just pick one end and you will create your gene map from there.

01:02 So i'm going to say start with y because i see here h and y are 6 map units apart.

01:11 That's really close.

01:12 So i'm going to start with that.

01:19 So i'm going to put h 6 map units away from this, away from y, which means that g and h should be the total distance of 35 minus that 6.

01:33 So they should be 29 map units apart.

01:38 And i can go over to my list see if that is on the list and it is.

01:42 So that is correct.

01:44 So so far so good.

01:46 And then i will just keep going from there.

01:48 I'll go to the next one and i'll find say the closest one to h...

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