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If in sample and dominance what is the result when a dominant allele pairs up with a recessive allele?
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In simple dominance what is the result when a dominant allele pairs up with a recessive allele?
How will you know which allele is dominant and which allele is recessive?
A dominant allele expresses itself in every offspring in every generation. A dominant allele expresses itself irrespective of the other allele present along with it. A recessive allele, however is masked by the presence of dominant allele. It can express itself only if the other gene in the allele pair is also recessive. As a result, it is not expressed phenotypically in every generation.
Asked in Genetics, Biochemistry
What contrasting alleles may in some cases result in a case where neither allele is dominant over the other?
Asked in Genetics
How does the dominant allele mask the effect of a recessive allele?
In diploid organisms (those with two copies of each gene carried on separate chromosomes), one of the copies of a given gene may differ from the other copy of the same gene on the twin chromosome. In some cases one version of the gene (the dominant allele) has the effect of 'masking' the activity of the other (the recessive allele); that is, the presence of the dominant allele negates the effect of the recessive allele on the organism's phenotype. There are many mechanisms which can cause this phenomena, and it depends on the particular genes involved, but a simple model is one where the recessive allele is a biochemically inactive version of the dominant allele. In this case the dominant allele would mask the effect of the recessive allele by providing an active version of the gene. The dominant phenotype would be the one which shows the downstream effects of this activity, and the recessive phenotype one which shows the downstream effects of a lack of activity. The dominant allele is said to 'mask' the recessive allele because only one copy is required to result in an elimination of the recessive phenotype, whereas all copies of the gene must be the recessive allele to result in the recessive phenotype.
Asked in Genetics
Genotype AA produces what phenotype?
The genotype AA represents a homozygous dominant genotype. The capital letter "A" represents the dominant allele, while the lowercase letter "a" would represent the recessive allele. If both dominant alleles are present in a genotype (homozygous dominant) then the phenotype is "A" phenotype. If one dominant allele and one recessive allele are present (heterozygous dominant) then the phenotype is "A". Finally, if both recessive alleles "a" are present (homozygous recessive) then the phenotype is "a". Therefore, the answer to your question is the genotype AA would result in an "A" phenotype because the genotype is homozygous dominant.
How is inheritance different from dominant recessive inheritance?
Please excuse me if I'm misunderstanding the question. However, there is typically a dominant and a recessive allele for traits. The result is divided into two categories: the phenotype and the genotype. The phenotype is the visible trait, the dominant if there's one present, and the recessive is the underlying trait that is only visible when there is no dominant trait present. There are some exceptions to this: polygenic traits, incomplete dominance, co-dominance---which could be determined to be the difference between inheritance, or perhaps the difference you're referring to is the difference between phenotype and genotype.
A single gene trait that has two alleles and that shows a simple dominate recessive pattern will result in?
Asked in Genetics
Why are allele dominant or recessive?
Each human have two copies of each of our gene - one from the mother, one from the father. Each copy is called an allele. The instructions of the mother and father allele need not be the same. Examples of why alleles are dominant or recessive? Some proteins are dominant over other proteins and the allele having the dominant protein becomes the dominant allele. Sometimes one allele may make a broken protein. This allele becomes nonfunctional and shuts off. In this case the functional allele becomes the dominant allele and takes over. Red hair is a recessive allele. There is a protein called MC1R. The job of the MC1R is to get rid of all the red pigment. When the MC1R does not work properly there is a build up of the red pigment and the end result is red hair.
When there is a combination of traits expressed in their young ones which will be the dominant and which will be the recessive?
The results in the offspring hinge on the genetic make up of the parents. Each expressed trait is either the result of a dominant or recessive phenotype. The relative dominance or recessiveness of the alleles doesn't change only the rate at which they are expressed based on the allele present for each obseerved trait in the parents.
If a pea plant has a recessive allele for green peas what will it produce?
A recessive allele means that the gene codes for an nonfunctional enzyme. If the pea plant has 2 recessive allele for the green pea gene, that means that the green pigment will not be deposited on the peas, as the enzyme is nonfunctional. The result would be yellow coloured peas. If the pea plant has one recessive and one dominant allele for the green pea pigment, then it will result in a half functional enzyme, which is sufficient for the green pigment to be deposited.
Homozygous dominant and homozygous recessive the offspring are?
The offspring of a homozygous dominant and homozygous recessive cross will be heterozygous. This means that they will have one of each allele, and will have the phenotype of the dominant allele. For example, if B leads to black fur and b leads to white fur: The cross BB (black) X bb (white) will result in Bb (black) offspring.
What happens when two genes are dominant?
Dominance in genetics is not a black-and-white thing. An allele may be dominant to one rival allele, but recessive to another. Ultimately, it may depend on the degree of functionality of the protein encoded by the allele. For instance, one allele may code for a non-functional protein, or not code at all. In that case, it would be recessive to any competing allele that did code for a functioning protein. Also, phenotypes are often the result of gene complexes - no single allele codes for a particular phenotypic trait, but many together do. The relationship between dominant and recessive alleles in such a complex may be equally complex: there may be degrees of expression along a sliding scale, or specific values for each dominance/recessiveness relation (eg. spots or no spots; green eyes, gray, brown or blue; curls or no curls, etc). See links below for more information.
How did Mendel know the the tall pea plants in the first generation had a hidden factor for shortness?
By "test cross" you can know whether it homozygous dominant or heterozygous dominant...in homozygous both alleles code for the dominant trait, in heterozygous one allele is recessive (what you called a "hidden factor"). To perform the test cross, cross a homozygous recessive with the first generation. Lets suppose tall pea tree in the first generation is hetrozygous dominant (Xx) and has alleles X (dominant) and x (recessive). When we cross it with homozygous recessive (xx) X x x :Xx xx x :Xx xx we get half offspring showing dominant trait (Xx) and half showing recessive (xx). If the first generation was homozygous (which is not possible) the result would be X X x: Xx Xx x: Xx Xx all the offspring showing dominant trait and it doesn't really happen when we cross the first generation with homozygous recessive. It means that the genotype of first generation is heterozygous (has a hidden factor or a recessive allele x). Note:You must know what the recessive and dominant allele means...In presence of a dominant allele, recessice character is not expressed but it is present is heterozygous. If both alleles are recessive (homozygous recessive) then the recessive trait is expressed. If both the alleles are dominant (homozygous dominant) obviusly the dominant trait is showed by the individual.
What is the difference between dominant and recessive alleles?
Dominant alleles are expressed regardless of any other alleles. Recessive alleles are not expressed if a dominant allele is present. Dominant alleles are written with capital letters (eg. B or T), recessive with lower case letters (eg. b or t). Dominant - if B codes for black fur - BB and Bb will both end up with black fur. Recessive - if b codes for white fur, only bb will result in white fur.
What does recessive allele disorders mean?
Recessive allele disorders are just as they sound - they are disorders that are a result of a prevalent recessive allele in one's genetic makeup. A recessive allele disorder will rarely occur since it is dependent on the crossing of two heterozygous parent cells, but it can lead to interesting consequences. An example of a recessive allele disorder is hemophilia - the body's inability to clot blood - and it has affected much of the European royalty in history, such as Queen Victoria of Great Britain.
Asked in Genetics
To determine the genotype of an individual that shows the dominant phenotype you would cross that individual with one that is?
To determine the genotype of an individual that shows the dominant phenotype you would cross that individual with one that is homozygous recessive. A monohybrid cross of two individuals that are heterozygous for a trait exhibiting complete dominance would probably result in a phenotype ratio is 3 dominant 1 recessive.
Asked in Biology, Botany or Plant Biology, Genetics
What are some examples of codominance in living organisms?
Asked in Genetics
What do you call two genes that govern the same characteristic?
Two genes which govern the same characteristics are called alleles. Alleles located at the same locus on a chromosome pair determine phenotype (the expressed characteristic), at least in simple Mendelian genetics. Characteristics can also be controlled from two loci (epistatic/hypostatic) and from several loci (polygenic). There is space on the genome for 2 alleles for a certain characteristic. One is taken from each parent. For example, you might have one allele coding for black fur (B) and another for white (b). Alleles have different dominance so if the allele for black fur was dominant you have two allele combinations that would result in black fur: BB and Bb There is only one combination that could result in white fur: bb The less dominant allele is known as the recessive allele.
A pea plant has a tall stem what are its possible genotypes-?
What is an individual with genotype AAA described as?
An Aa genotype can result in the same phenotype as either an AA or AA genotype, if one of the alleles acts in a dominant fashion. If the A allele is dominant over the a allele, then the phenotype of a heterozygous (Aa) individual will be the same as the phenotype of a homozygous dominant (AA) individual.
Asked in Anemia
Is a sickle cell anemia more likely to be dominant or recessive?
Asked in Pregnancy
My children were born had a plus now mydaughter is pregnant and doctor said she is a - can this happen?
Odds are one of the tests were mixed up or done improperly. Have her get retested by her Dr to make sure. Also could the genes be a factor? + blood could be dominant, - recessive and the daughter could have had dominant and recessive genes for blood types, and her boyfriend could be recessive or dominant and recessive, so when their DNA mixed, the result could have been double recessive.?
Is there any evidence that the trait shared by most or the population is not controlled by a dominant allele?
There are many traits that are found in the majority of populations that are recessive alleles. Conversely, some rare conditions are the result of dominant alleles. Dominant alleles do not dominate the population because of independent assortment. An example of a recessive allele is O type blood. O typ blood is the most common blood type. There are four types of blood (because typing is co-dominant) A, B, AB, and O. If you have two A alleles or an A and O, you have A type, if you have two B alleles or a B and O, you have B blood type, if you have an A and a B, you have AB, if you have two O's, you have O type. Looking at that, you would think a minority of people would have O but O is the most common blood type in the US population (It is not true of all populations, however.) Conversely, some rare diseases are controlled by a dominant allele Huntingtons, for example is dominant but the allele is rare. Polydachtly (extra fingers) is dominant as well but has not taken over the population because there is no advantage (and hasn't been selected-for) and because of independent assortment.