00:01
So this question wants us to explain how streaks of pigmentation occur in corn.
00:05
And the streaks of pigmentation are actually due to the activity of the activation gene and the dissociation gene, which are transposable elements discovered in corn by barbara mcclintock.
00:18
So the activation gene and dissociation gene are dna transposons with terminal inverted repeats, which generate flanking direct repeats whenever these transposons insert into dna.
00:28
The activation gene is an autonomous transposon, in that it only needs the genes encoded within itself to transpose itself.
00:40
And the dissociation gene is a non -autonomous transposan, in that mutations inactivated its transposase gene.
00:50
So the dissociation gene is unable to transpose on its own.
00:55
However, the transposes encoded by the activation gene can still recognize the terminal inverted repeats of the dissociation gene.
01:06
So in this way, the dissociation gene can transpose if and only if the activation gene is present.
01:13
And it is actually the movement of these transposons, which cause streaks of pigmentation.
01:19
So if a corn kernel develops from one cell that develops via my tautium.
01:26
So if a transposable element knocked out the pigmentation gene in corn, then the corn will appear yellow, as you can see here...