00:01
So we have a variety of wheat with red kernels, a prime, a prime, b prime, b prime, and a variety with white kernels.
00:12
And these were intercrossed to produce f1.
00:20
And then those were crossed to produce an f2.
00:24
So each of the prime alleles increases the pigment in equal amounts.
00:29
We want to know the phenotype of the f2 generation.
00:32
So we're going to make a big 16 -box punnett square.
00:35
There's ways to do this with math but sometimes in these complicated problems i like to do the 16 box version so we can pass down a prime b prime we can pass down a prime b we can pass down a b prime or we can pass down a b for both parents a prime b prime make the primes a little bigger a prime b a prime a b so fill in your square i'm gonna fill in mine and then you can check your work and then we'll go through and we'll analyze the phenotypes okay so we're going to start with white and there is only one white individual then we're going to start with we'll call it level one pigment so that means they only have one prime it doesn't matter what it is a or b so i'm going to go through and i'm going to highlight all of them yellow so we're looking here's one here's one here's one i think that's it so there's going to be three individuals that have that level one pigment level two pigment these are just arbitrary names i'm calling them.
02:20
These are going to be people or wheat plants that have two primes.
02:24
We're going to color those blue.
02:26
Blue highlighter.
02:27
Doesn't matter what two again...