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A single gene trait that has two alleles and that shows a simple dominant recessive pattern will result in?
Wiki User
∙ 11y ago
A 3:1 phenotypic ratio (Mendelian inheritance).
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoA single locus with two alleles where one allele is dominant and the other recessive will be heterozyous and will have the dominant phenotype.
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What would have most likely stopped mendel from finding a pattern in his result?
If seed shape did not have a clearly recessive form
How does a recessive trait show up as a visible trait?
Recessive alleles are only expressed in the phenotype if the organism is homozygous for the recessive allele (assuming diploidy). If the trait is sex-linked, then it will always show up in males if passed.
Explain how Mendel was able to disprove what most people believed about inheritance?
Mendel's pea plant experiments showed that at least two types of alleles (dominant, and recessive) must exist. Lets say for example that a red plant (for argument's sake, homo. dominant, RR) is crossed with a white plant (homo. recessive, rr). Most schools of thought at the time would have believed the result of this cross to be pink plants. This is true in some cases, but this was not what Mendel discovered.Instead, Mendel found the offspring to all the red. The reason?? All of the offspring were heterozygous, meaning they each had one dominant allele, and one recessive allele. (Rr) When this occurs, only the dominant form of the trait (in this case red) will be manifested.When a red plant and a white plant (for example) are crossed and yield a pink plant, the gene is considered to have "incomplete dominance". There is lots more to learn about simple genetics like this, most of which can be learned in a high school biology course as well as first year university biology. I suggest you check it out if you are still interested in learning more.
What conclusions can be made from Mendel experimenting with pea plants?
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How does a characteristic which helps an animal to live longer will generally tend to become more common in the population as a result of evolution by natural selection?
The trait, 'to live longer ', would only be selected for in individuals if it was reproductively successful. Then the alleles for living longer would be more frequently represented in the population of these animals.
What is the difference between dominant alleles and recessive alleles?
dominant-appears in first generation recessive-seems to dissapear
What is the result of two recessive alleles joined?
Two recessive alleles (homozygous) will result in the recessive trait being expressed as a phenotype.
What contrasting alleles may in some cases result in a case where neither allele is dominant over the other?
If both alleles are recessive, then you will haev a case where contrasting alleles that do not have dominance. Neither allele has the power to be dominant so they will both have equal power of genetics.
What phenotype is produced by AB genotype?
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 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 kind of trait is expressed when two different genes from the same trait are present?
It depends on the gene in question, and the type of dominance of the trait.For monogenetic traits (those controlled by a single gene), the dominant trait(s) will be expressed when two different alleles are present.For example, if B leads to black fur and b leads to white fur:Complete dominance would result in a rabbit with Bb having black fur.Incomplete dominance - Bb would result in grey furCodominance - Bb would result in black and white patches/spots/etc.
Is sickle cell an dominant or recessive?
Sickle cell anemia is an autosomal recessive disorder. It can result from two carriers having a child together.
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.
Does a dominant allele mask a ressessive 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.
What is the result of a cross between an individual who is homozygous dominant and another who is homozygous recessive for a trait?
All the offspring will be heterozygous with a phenotype showing the dominant trait. Let the alleles be H (dominant) and h (recessive). All the gametes from the first individual will be H, and from the other, h. Thus all the offspring must be Hh.
Which genotype would result in an individual with the dominant phenotype?
In classic genetics: AA or Aa for autosomal dominance; for sex-linked dominance, females will need XX or Xx, while males will need Xy It gets more complicated with epistasis and other factors that modulate the genes.
How do you know if a gene is dominant or 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.
