00:01
We are given phenotypes, and we are asked to figure out genotypes.
00:06
So we're going to start with just the information that we're told.
00:10
We're told that of the parents, there is a truebred purple flower that is crossed with a truebred white flower.
00:21
And all of the offspring are purple in color.
00:29
This is, as far as we're told, just a simple genetics.
00:33
So one gene, no epistasis happening, nothing crazy, which means that it appears we are dealing with simple dominance and recessiveness.
00:47
Because when we mix the purple parent with the white parent, their offspring didn't become a mixture, didn't become like a lavender, which would have been an example of co -dominance.
01:01
And the offspring weren't purple and white splotched, which would have been incomplete dominance.
01:06
Instead, we only have one of our two original colors, which means that purple is our dominant color.
01:18
So this parent who's true breeding for purple, that true breeding means that both of their alleles are the same.
01:26
So we'll say that this is the dominant form of the allele, which means that they would have the genotype of homozygous dominant.
01:35
Two dominant in this case, we'll say a's, which means that our other parent who has a white color, color, we'll assume that's the recessive color...