00:01
In chickens, black feathers are dominant to white feathers.
00:04
Okay, so i'm going to do a punnet square.
00:06
So let's have capital b for black and little b for white.
00:14
Because we use the capital letter would be dominant trait.
00:17
And we're doing a cross between chickens have both black and white feathers.
00:21
Okay, so this isn't just your regular complete dominance problem.
00:24
This is a case of co -dominance.
00:29
And in co -dominance, the heterozygote has both traits.
00:36
So heterozygote has both traits.
00:45
So these chickens have both black and white feathers.
00:49
So they have one black allele each and one white allele each.
00:56
So this is our cross.
00:58
And we want to know what we get from the offspring.
01:01
Okay, so we'll do upon it square.
01:03
A quick note is not to mix up co -dominance with incomplete dominance.
01:07
In complete dominance, the heterozygote has an intermediate phenotype.
01:12
So in this case, they wouldn't have black and white, they'd be grey.
01:16
But obviously we're not seeing that, we're seeing co -dominance where they get both traits...