00:01
Question number five tells us that we have a couple.
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There's a mom and a dad.
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They have two kids.
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And those two kids happen to be one being type a.
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One of the kids has a type a blood type.
00:21
And one of them has a type o blood type.
00:27
And we're asked to figure out the possible genotypes for these two parents, for them to have these kids.
00:38
Know that type o is a recessive gene or a recessive trait, meaning you have to have two copies of the recessive gene o type for you to be type o.
00:57
So right off the bat, we already know that we need to have both parents having at least one allele for o, right? and from there, we're just going to look at the other possibilities of having this combination.
01:20
One possibility is if one of the parents is phenotypically type a, meaning one would be a dominant gene a, and the other one would be the alleleo.
01:40
So this is still going to be phenotypically type a.
01:44
And one parent could also have the same thing right the other parent could also be type a and that's going to give us this combination oh oh there we go so here we have three out of four type a and one out of four type o because remember a is a dominant gene so all these three are going to have a blood type a so that's one possibility both parents being type a.
02:42
Now let's look at another possibility.
02:49
Since one of the kids is type a, we know that at least one of the parents would have the allele for type a.
03:02
So let's say it's this parent.
03:03
It doesn't really matter which one.
03:07
But we need at least one a allele...