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Answered 2010-12-02 04:54:34

Heterozygous

(got it from my 9th grade Biology textbook)

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An organism that has an allele for brown eyes and an allele for blue eyes you?

heterozygous


Is the allele for blue eyes dominant?

No. The allele for brown eyes is dominant.


What if your friend has blue eyes her genes contain one allele for blue eyes and one allele for brown eyes which allele is recessive how do you know?

The brown allele is recessive. Think: Blue = B, and brown = b Your friend is Bb, or heterozygous for the gene. In heterozygotes, the expressed phenotype is the dominant gene, which in this case, apparently, is blue. Thus, because your friend does not have brown eyes, the brown allele must be recessive.


What type of allele is always expressed?

The dominant allele is always expressed. For example, someone may have an allele for blue eyes but still have brown eyes because brown eyes dominate over blue eyes.


Why can a person with brown eyes carry blue eye alleles but a person with blue eyes cannot have a brown eye allele in their genotype?

Because the brown eyes allele is the dominant one.


An example of allele?

The dominant allele for brown eyes (B) over the recessive allele for blue eyes (b).


Does a dominant allele mask a ressessive allele?

A recessive allele shows only if the the individual has two copies of the recessive allele. As brown eyes are dominant over blue eyes, for blue eyes to show there would need to be two copies of the recessive allele. A dominant allele shows even if the individual has only one copy of the allele. Again, the allele for brown eyes is dominant so brown eyes are dominant over blue eyes, therefore the dominant allele always masks the recessive allele.


What color eyes will a baby have if the dad has blue eyes and the mom has brown eyes?

You'll have to look at the baby's eyes and see; there's no easy way to predict that. If both parents had blue eyes, then we can predict that the baby will have blue eyes, but even this isn't 100% certain,


Is eye color a homozygous recessive genetic disorder?

Blue eyes - homozygous recessive Brown eyes - homozygous dominant Brown eyes with one brown allele and one blue allele - heterozygous


Dad has brown eyes mom has brown eyes can they have a blue eyed baby?

yes, if both parents have the ressive allele for blue eyes there is a decent chance that the baby will have blue eyes.


Is it possible for two brown eyed people to have a blue eyed offspring?

Yes, If both parents are carry one brown allele and one blue allele, they will both have brown eyes but there is a 1 out of 4 chance that the offspring will have blue eyes.


If mom has brown eyes and dad hazel eyes what color eyes would baby have?

The answer depends on the genetics of the brown-eyed mother. If she has two brown alleles, than most likely the baby will also have brown eyes. However, if the mother has one brown allele and one blue allele (and thus phenotypically brown-eyed, as brown is dominant), it is certainly possible for the baby to have blue eyes (receiving one blue allele from the mother, and one blue allele from the father...if in fact the father is blue-green hazel). Mendelian genetics, in this case, would approximate 25% of the babies to be born blue-eyed.


What is the science term for one allele for brown eyes and one for blue eyes?

Heterochromia


What are the relationships between blue eyes and brown eyes in human?

It is all based on alleles, the dominant allele is Brown and the recessive is blue,grey or green. If both parents have brown eyes the chances are that there child will have brown eyes as you need two recessive alleles to get blue eyes whereas you only need one dominant allele to get brown eyes. But say for example both your parents have Brown eyes though they both have 1 parent with blue eyes, if they both carried that recessive allele and both recessive alleles from both parents joined the child would have blue eyes. Eyes are all based on genetics and DNA.


What is an example of a recessive allele?

blue eyes blonde hair etc.. brown eyes and brown hair are dominant


What is dominant and recessive allele?

A dominant allele is one which expresses what it codes for such as eye color no matter what the other allele is. A recessive allele will only express what it codes for if there is a recessive pair. All alleles come in pairs except on the XY chromosomes. For eye color Brown is dominant and blue is recessive so... (B=brown b=blue) BB = brown eyes Bb = still brown eyes even though there is one blue allele bb = this is the only combination where you can get blue eyes Or simple dominance for gradpoint!


What is a complete sentence using the word allele?

My dad has brown eyes and my mom have blue eyes.


What is the difference between homozygous and heterozygous organism?

it's to do with genes, a homozygous organism has two alleles that are the same, whereas a heterozygous organism will have two different alleles. eg, on a chromosome for eye colour, a homozygous example would have both alleles for say, blue eyes. a heterozygous example would have an allele for blue and an allele for brown, where brown would be dominant, reccesive, or cooperative.


What are Phenotypes?

The visual representation of a genotype in an organism. Examples: Blue eyes or Brown eyes.Eye color, blue or brown.


Can blue eyed parents have brown eyed child?

Normally, no, they can't. This is because the allele for blue eyes is recessive, whereas the allele for brown eyes is dominant. Since both parents have blue eyes they are both homozygous recessive ie. carrying only blue eye alleles. Since both parents only carry the blue eye allele they can only pass blue eye allele on to their children. BUT, there is a fractionally small possibility that a spontaneous mutation could occur in the eye colour gene in one of their gametes that would change an allele for blue eyes into an allele for brown eyes. If this gamete then takes part in fertilization then the resultant child will have brown eyes because they are now heterozygous (one blue eye allele, one brown eye allele) with the brown eye allele being dominant. ALSO, it could happen if one of your prospective parents is a chimera - a person who has effectively two genotypes because their cells originate from two different zygotes. If one of your prospective grandparents had brown eyes and gave a brown eye allele to one of this chimera's genotypes (the one responsible for forming gametes) while the other genotype of this chimera (the one responsible for forming eyes) had only blue eyed alleles, this blue eyed person could form gametes with brown eye alleles and hence have a brown eyed baby. Human chimeras are extremely rare, but an example would be Lydia Fairchild. Isn't genetics wonderful?


What color eyes and hair will a baby have if mother has blonde hair hazel eyes father has dark brown hair brown eyes grandmother has blonde hair green eyes and grandfather has blonde hair hazel eyes?

Two alleles are responsible for determining both eye color and hair color. The allele for brown hair is dominant over the allele for blonde hair. The allele for brown eyes is dominant over the allele for blue eyes.If the organism presents with the dominant allele it can either be homozygous or heterozygous. But if it presents with either blonde hair and/or blue eyes it is homozygous for the recessivge alleles.Hazel, green and brown are all mutations of eye color but from the same allele that is responsible for brown eyes - so with the alleles there are really only to classes of eye color brown and blue - and if your not blue eyed your under brown eyes.Letting; H = brown hair and h = blonde hair and E = brown eyes and e = blue eyesMother Blonde = hh Hazel = EE/EeFather Brown = HH/Hh Brown = EE/EeI assume the grandparents are from the mothers side because 2 natural blondes should only have blonde children naturally.1/4 chance of baby being blonde 1/12 will have blue eyesAnother answerIt's very possible that a child could have red hair also with those genes. I have many family members that have a red headed child.


What is a homozygous phenotype and a heterozygous phenotype?

Are you talking about phenotype or genotype? Phenotype is the expression of the genotype. Genotype is what you inherited. Phenotype is what you see. Homozygous is the same. Heterozygous is different. If you inherit one allele for blue eyes and one allele for brown eyes, your phenotype should be brown eyes. Your genotype would be brown eyes, blue eyes. You would have a heterozygous genotype.


If mother has blue eyes father has brown eyes and grandmother has brown eyes on mothers side?

If what you're asking is how did your mother get blue eyes, then I can answer that. Brown is the most common eye color, meaning that it is obviously the dominant allele. Your mother must have gotten two recessive alleles for blue eyes; it's the only way that the recessive blue wouldn't be masked by the dominant brown.


What if a gene skips a child can that gene be given to there kid?

A person can only pass on genes that he/she has inherited from his/her parents. You may be talking about a situation in which a recessive gene is not expressed in a child because it inherited a dominant allele as well, and is heterozygous for that trait. If that child then has his/her own child, the recessive trait could be expressed in the children of that child, if the other parent also carries the recessive allele.Example: One parent has brown eyes, the other has blue eyes. Their child inherited a brown eye allele and a blue eye allele, and has brown eyes, but is heterozygous. This child then has a child with another brown-eyed person, and their offspring has blue eyes, even though both parents have brown eyes. It just so happens that both of these parents are heterozygous for brown eyes, so they both carry the recessive blue-eyed allele which they each passed on to their blue-eyed offspring. So, this makes it look like the blue-eyed allele skipped a generation, but in reality it was always there, but not always expressed.


What is meaning of alleles?

An allele is the different forms of a gene. For example the gene for eye colour has the alleles; brown, blue, green etc. In every person there are two alleles for every gene but both alleles are not always the same. They can be dominant and recessive; dominant alleles are expressed no matter what other allele is present, recessive alleles require both alleles to be the recessive one to be expressed. E.g. say B is the allele for brown eyes and b is the allele for blue eyes. Brown is dominant therefore if someone had Bb or BB they'd have brown eyes and if they had bb their eyes would be blue.