00:02
So this is a question asking us about point mutations, so changes in the letters of the dna, and how those point mutations always lead to a change in the genotype, but don't necessarily lead to a change in the phenotype.
00:23
So let's look at this.
00:25
Remember the genotype is the genetic makeup of an organism.
00:30
And here we're going to focus on the dna.
00:33
And we'll just look at one strand of dna.
00:35
So imagine i have an a, an a, a t, a t, a c, a c, and for the sake of repetition, g and g.
00:47
So a, a, t, c, c, c, g.
00:49
And imagine there's a point mutation, we changed that t to another a.
00:54
So it's now a, a, a, t, c, c, g, g.
01:03
Have we changed the genotype of this organism? and the answer is yes.
01:07
We've changed it.
01:09
We changed it because we changed the sequence of bases in its dna, whether it's consequential or not is another issue.
01:16
But we have changed the genotype.
01:18
So point mutations change genotypes because the letters change.
01:24
So that is always true.
01:26
You're going to have a point mutation that changes the letters.
01:29
You're going to change the genotype...