What does bbgg mean

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With free trial classes, you can work with a 99th percentile expert free of charge. Then put the check command after the steady command and use the output to fix the steady state. When I caliberate the modle ,the model can be solved correctly. Dynare uses 0 as the starting value for steady state computations, if you do not supply other values.

So check in your model that you do not divide by a variable that is initialized with 0. For example, you divide by Rk2 which is not initialized in an initval statement.

Hence the initial value of 0 is not compatible with the equation where the division occurs. It is not until the baby is born and the pigment is transcribed from the DNA the colour will actually be seen. Now we know there are blue eyes, brown eyes and green eyes and a multitude of colours that seem to fall in between. Brown is the original and most dominant pigment. Blue eyes originated from a genetic mutation so no pigment is expressed and eye colour remains the same blue as a new born.

This makes brown eyes dominant because if one parent does not have the information to produce the pigment blue eyes the child will get the information from the other parent. As not as much pigment is produced, the child will have paler brown or hazel eyes. There are also green eyes, which may be a separate gene altogether, or I would predict it to be a different version of the blue eye mutation. This would mean pigment is still produced but it is a slightly different form so the colour green is reflected instead of the dark brown.

Now we do see people with bright blue eyes, a lot darker or brighter than a new born baby which is possibly due to a separate gene. The presence of an enhancer gene would affect the amount of pigment produced, a positioning gene may affect how the pigments align with each other or a protective type of gene may affect how the light is reflected as it hits the eye.

How this gene works may be inherited and may be affected by the environment, such as a response to UV light. As we age different genes in each cell are switched on and off depending on where you are at in the life cycle such as the genes determining the eye development in a foetus may never be switched on again in later life. It is different genes to switch on causing the eye colour you see. For some people this may also have an affect on the pigments at different stages as will environmental effects such as UV light.

If, for argument sake, we say there are 6 genes involved in eye colour, the model would be a lot larger. This gives 64 possible combinations from each parent. A 64 by 64 model means inheritance is out of 4, This would explain why there are so many variations and while two dark eyed parents are more likely to have a dark eyed child, two light eyed parents may still have a darker eyed child.

This is just my theory and I welcome any feedback. I'm doing a project on eye color and this really helped me out. I thank you a lot, reading this will help me on my test coming up as well. I am still confused. My mom has green eyes and my dad has hazel eyes. I have brown eyes. Where did I get this trait from? My dad's hazel eyes are more brown than green by the way. In fact, some people may even argue that they are brown!

Sorry, my mom told me that my dad has brown eyes but some people seem to think they are hazel. My husband is Japanese with brown eyes obviously and I am mostly German with blue eyes.

Our daughter has blue eyes. If brown is dominant, how is blue expressed in my daughter? Sorry this is making me be anonymous - I previously posted as katspj, anyway Some ethnic group dark eye colours are very interesting because the colour is expressed from birth. While this model eye colour is based a baby being born with blue eyes and if the dominant brown eye gene is present it is expressed sometime during infancy.

In some ethnic groups, usually when the colour is so dark almost black, the eye colour is expressed from birth. This gene is active long before the brown eye genes referred to in this model. In this case, sometimes the pale eye gene may prove to be more dominent. When the babies eyes are being formed in the womb, the gene is only be active on either the chromosome inherited from the mother or that inherited from the father, not both.

This can occur when genes include a "bar body". This is like a little enzyme the goes and binds to one chromosome so it is not active. In this case a gene won't be active until it's bar body is bound. Whether the pale eyes or the dark eyes are dominant can vary from one couple to the next as it is dependent on how efficiently one genes "bar body" works against the opposing gene. I hope this makes sense Hi, My question to you is it possible to have the same mother and father if my two siblings have different coloured eyes to me As shown by the punned square, in that eg you could have 16 siblings with lots of different eye colous.

Very possible. Even in the basic model if only one set of genes determined eye colour you could get a brown a green and a blue in each of the offspring. Lets say Mum had brown eyes B and carried the gene for blue eyes b and Dad had green eyes G carrying the gene for blue eyes b. So Mum has genes Bb will give each child either the brown eye gene or the blue eye gene and Dad has gene Gb so he will give each child either the green eye gene or the blue eye gene.

Children will inherit the following combinations Bb - Brown eyes Gb - Green eyes bb - Blue eyes BG - this is an interesting one likely to be Brown, dominant over green or a very dark green. As I have said in a previous post; there are more genes than this involved so it is a lot more complicated so there are a lot more variations but this does give an example of how one gene can cause 4 variations. I would really like an answer on the mystery behind my eye color. There are hints of green around the edges, but the center of the iris is almost completely golden and extremely light-colored.

My eyes are photosensitive and I have to wear glasses outdoors at all times. I am married to a british man with hazel eyes. Both of our children have sky-blue eyes. My mom had brown eyes and my father had blue. Is there a way I can send a picture of my eyes to you?

I had one doctor suggest it might be some sort form of albinism I didn't really buy that, considering I have brown hair. I can't possibly answer your question without a lot of information about the genes alleles you carry and those of your biological parents. Neither can anyone else. My mother has dark brown eyes and brown hair. My father has light brown hair and sky blue eyes. My maternal grandmother had blue eyes, as did my paternal grandmother. I believe my maternal grandfather had brown eyes and my paternal grandfather had bright blue.

Almost everyone in my family has brown hair, spare my maternal grandmother, who was a redhead. My daughter is a redhead and I am worried that she has inhereted my eye trait, though it is too early to tell she is 6 months. My son has sky blue eyes and brown hair. From katspj To Melanie Dodd Albinism is when a pigment is not expressed and it is possible this occurred only in your eyes. Maybe you inherited a pale brown gene from your Mum but the pigment gene from your Dad was suppressed. Remember brown is dominant so your Mum will also carry a gene for another colour but you won't know what this colour is and this is possibly the gene you inherited.

It may be still possible the eye genes inherited from your Mum and Dads still gave you the yellow colour without the albinism trait.

Although lacking pigment genes is also likely to cause your eyes to be more sensitive. Your children can also inherit the blue eye gene from you without inheriting the cause for albinism. As Laurence A. Moran said, a lot more information is required to an exact answer but I hope you feel satisfied with this as a feasible explanation. Dear Sir, myself and my husband are both Indians and I have dark brown and my husband has light brown eyes.

Our parents have similar, although my mother has honey coloured eye balls. Should we be worried if there is some defect? What can we do to test at home to see if everything is normal?

Please help. Thanks in advance Prathusha. My mother has dark brown eyes almost black in color, they are so DARK brown! My father had the most beautiful, clear, steel blue eyes that I have ever seen in my life. According to your chart, it is not even possible. Both my parents have green eyes in fact, my entire immediate family on both sides have green eyes, and yet I have one green and one brown. No medical issues! I am wondering what a Punnet square for this would look like.

More Recent Comments. The genetics of blood type is a relatively simple case of one locus Mendelian genetics—albeit with three alleles segregating instead of the usual two Genetics of ABO Blood Types. Eye color is more complicated because there's more than one locus that contributes to the color of your eyes.

In this posting I'll describe the basic genetics of eye color based on two different loci.