00:02
Androsophila melangaster, white eyes is an x -linked recessive mutation.
00:08
Normal eyes are red.
00:10
At the autosomal wing shape locus, normal shaped wings are dominant to vestigial wings.
00:18
The following cross was made.
00:20
What proportion of the progeny from this cross will be females with red eyes and vestigial wings? write your answer as a numerical value rounded probably to four.
00:31
Decimal digits do not write it as a fraction or percentage so i went ahead and did the dihabit cross to save some time and then i couldn't write small enough to get it all in there and so to help me save space and to kind of make it more easily visually seen my vg is just a capital g and then my recessive for the wings is just a lowercase g so i basically just left off the v.
01:04
So to fill out our punnet square, we take each of our parents and you figure out the allele, the possible allele combinations.
01:16
So right here's our parents and you just take this first x and match it with each of the traits for the wings.
01:25
Then you take the second x and match it with each.
01:27
And then you do the same for the male.
01:31
And then you fill out your punnet square, each offspring getting one allel from each parent.
01:39
So our question asks, bring it down here a little bit, what proportion of the progeny from this cross will be females with red eyes and vestigial wings? so we're just looking at the females.
01:59
So we can kind of ignore from here on down because those are all males.
02:05
So just looking at our first two rows, it's asking for red eyes.
02:10
So we'll just start with that trait.
02:13
Red eyes, as it tells us here at the top, red eyes are normal and they are dominant...