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All right everybody, so we are going to start going over this genetics problems worksheet I'm going to start with number one and move through the first question is Aurora and Ryan are expecting a child Aurora has dark eyes and Ryan has light eyes is there any way that their child could have light eyes even if my eyes the flight is recessive to dark hint Aurora's mother has light eyes if Aurora's mother so let's go ahead and start we're going to use the letter e here, so it says ditch that light eyes says that light eyes is recessive to dark, so we know that E so I'm using the letter E here for the allele, so we would say light eyes would be the lowercase allele and then dark eyes would be the capital e alright if a roars mother had my eyes she would have been the genotype EE right, so Aurora has to be for Aurora to have dark eyes and her mother was EE Aurora's genotype has to be EEE alright and Ryan has light eyes, so he's got to be EE alright so now it says is there any way their child could have light eyes okay so let's take a look you want to set up a test cross we're going to do Aurora versus Ryan alright so remember we're going to split these up so this is my genotype remember Aurora is only going to give one allele in each of her eggs so if this is representing a gamete that's an egg it's a chance and this is a pasta right for for Aurora Ryan only has recessive alleles, so he's only ever gonna be able to contribute ease, so this would be Ryan here it's Ryan and that's Ryan as well so if they have this child it's going to be capital e lowercase e capital e lowercase e these two together make two lowercase E's and then here two lowercase BS so let's analyze this they have a 50% chance of having a dark eyed child and a 50% chance of having a light I child, so that's what you want to write but there's a 50%, so the answer is yes they could have a light I child 50% chance of having light eyes and that is question number one on your worksheet here all right, so we're moving on to question number two the question says Tom men is wife Julie are both carriers of cystic fibrosis and on disable recessive disease what is the chance that their first child will have cystic fibrosis is a carrier, so we want to look at here what's the chances of having the first child with cystic fibrosis or what's the chances of having a child it's a carrier so what's the lets kind of look at this situation so for this one I'm going to go ahead and use the letter D as my gene so are my alleles here so let's let's look at terminology here so the gene here is cystic fibrosis so here we are cystic um, so we're gonna use the letter D so if you have cystic fibrosis you're going to be autosomal recessive so you're gonna have to lower DS lowercase T's so that's going to be your genotype because it says autosomal recessive disease, so you have to have two recessive alleles to express cystic fibrosis if Thomas is like Julie are both carriers of cystic fibrosis Tom in his life so...
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