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Are dominant or recessive alleles easier to remove by selection?
Wiki User
∙ 12y ago
Natural selection favors whatever allele provides a selective advantage, so in theory it can operate on either. However, if a recessive allele provides an advantage it will soon shift and become the dominant allele, so it could be argued that natural selection favors dominant alleles.
This is only partly true.
A dominant gene always has some effect on the characteristics of the organism, even if the owner only has one of them. A recessive gene only affects the characteristics if there is no equivalent dominant gene to mask the effect. If both parents possess the recessive gene there is a chance the offspring will have two of them and this will show in their characteristics. When this happens, natural selection operates on the recessive gene. Much of the time, a recessive gene is present but natural selection does not affect it because there is a dominant gene that masks the effect.
If natural selection favours the recessive gene, the dominant gene will quite quickly disappear from the population. This does not make the recessive gene 'dominant' it's just tht there's no longer any competition.
If selection favours the dominant gene however, the recessive gene can linger in the population for much longer, because even when it is present, it is not selected against for most of the time. That is why conditions like heamophilia survives for a long time in humans, and you suddenly discover a white deer after many years in a herd of brown deer.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoWell, technically they are both equally difficult however if you are looking at the affect to the phenotype AKA how they are shown, then recessive are. Dominant alleles are represent both in the homozygous (AA) and in the heterozygous (Aa) and recessive can only be represented in the homozygous form aka (aa) so there it is.
Wiki User
∙ 13y agoYes.
Say you're trying to figure out eye color and one parent is homozygous (completely) dominant and one parent was homozygous recessive*. if you crossed these two people, one BB and one bb, all of their kid would have a Bb combination. You just wouldn't be able to see the blue. There are other ways to get this, but this is one example.
* Brown (B)=dominant, Blue (b)=recessive
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How is a recessive alle different from a dominant allele?
its different because adominant allele is in charge
Is it easier to analyze genotype by observing phenotype in organisms with complete dominance or in organisms with incomplete dominance?
It is easier to analyze genotype by observing phenotype in organisms with incomplete dominance (also known as codominance), because in incomplete dominance the individual will show a specific phenotype for each situation, whether it is homozygous dominant, heterozygous, or homozygous recessive. For example, in flowers, such as the ones that Mendel studied, a homozygous dominant flower will be red, a homozygous recessive flower will be white, and a heterozygous flower will be pink. In complete dominance, a heterozygous will only express the dominant phenotype, as opposed to incomplete dominance, in which a heterozygous individual will express a phenotype that is representative of both of the dominant and recessive traits. Because heterozygous individuals in complete dominance express the dominant phenotype, it is hard to determine whether the genotype is homozygous dominant or heterozygous for the trait. Hope this helps!
What is easier to get rid off in a flock of chickens a recessive allele for erect combs or a dominate allele for feathered legs?
Without knowing how many chickens show these traits, I would say the dominant allele, because if a chicken does not show the trait, then it does not have it, so it would be easy to identify and breed out. It would also be easier to know if you had actually gotten rid of the dominant trait.
How does hemophilia progress?
Hemophilia is a recessive allele condition. Men can get hemophilia alot easier than women as the allele is found on the XY Chomosome pair. With men. they do not have the extra "tail" on the Y chromosome compared to the XX with a female. If the person has the recessive allele on the X chromosome and this person is male, they will be a hemophiliac as they do not have a 'pair' allele which could be dominant to stop the condition expressing itself. On a female, if there is a recessive (hemophilia) allele on one of the X chromosomes but on the other is a Dominant (normal) allele then she will be a carrier of the faulty gene but will not suffer from the condition herself. If the female have a recessive (faulty) gene on each of the XX chromosomes, then she will be a sufferer of the disease.
Why did Mendel use peas for his studying of heredity?
Pea plants can only be either white or purple. In other words, there was no 'in between' color. This made it easier for Mendel to conclude that some genes are dominant (purple flower) and others are recessive (white flower).
How is a recessive alle different from a dominant allele?
its different because adominant allele is in charge
Is canavan disease dominant or ressesive?
I was doing a presentation on Canavan Disease and had a lot of trouble finding wether it was dominant or recessive. I found the answer and thought i should make it easier for others. Canavan Disease is recessive
Why can people pass on traits that don't show up in them?
some traits are more common and getpast on easier There are dominant and recessive traits- Each person has 2 copies of a gene that codes for a certain trait-this is called the genotype (one from mom and one from dad) Whichever trait is Dominant will be expressed- or passed on to you- for instance darker pigments are usually dominant over lighter pigments so if a person has genes for blue and brown eyes- they will most probably have brown fair skin or dark skin- probably dark red hair or black hair- black
Is it easier to analyze genotype by observing phenotype in organisms with complete dominance or in organisms with incomplete dominance?
It is easier to analyze genotype by observing phenotype in organisms with incomplete dominance (also known as codominance), because in incomplete dominance the individual will show a specific phenotype for each situation, whether it is homozygous dominant, heterozygous, or homozygous recessive. For example, in flowers, such as the ones that Mendel studied, a homozygous dominant flower will be red, a homozygous recessive flower will be white, and a heterozygous flower will be pink. In complete dominance, a heterozygous will only express the dominant phenotype, as opposed to incomplete dominance, in which a heterozygous individual will express a phenotype that is representative of both of the dominant and recessive traits. Because heterozygous individuals in complete dominance express the dominant phenotype, it is hard to determine whether the genotype is homozygous dominant or heterozygous for the trait. Hope this helps!
In your own words what does the term recessive trait mean?
A recessive trait is the opposite of a dominant trait. A dominant trait is the trait that overpowers another trait- represented by a capital letter. The recessive trait is the trait that is weaker, and being overpowered- represented by a lowercase letter. For example, if one person had a recessive trait for detached earlobes, it would be represented as " aa ",. If someone had a dominant trait for attached earlobes (meaning they had free earlobes), it would be represented as "AA"or " Aa "
What is easier to get rid off in a flock of chickens a recessive allele for erect combs or a dominate allele for feathered legs?
Without knowing how many chickens show these traits, I would say the dominant allele, because if a chicken does not show the trait, then it does not have it, so it would be easy to identify and breed out. It would also be easier to know if you had actually gotten rid of the dominant trait.
The difference between simple dominance recessive traits and incomplete dominance?
because dominant cells are beast gibberish! Hey, ID1256700420, if you don't know, move on to something easier for you! The answer to the question is this: Genes make proteins that eventually influence the expression in such a way that it is observable (seen). Example, if you have two genes for blue eyes, NO protein is made and there is NO color made for your eyes. The blue color is like the blue of the lake or the ocean, a result of the liquid in your eyes filtering out red light and leaving only blue. If you have one brown gene, brown pigment is made by the proteins from the brown gene and you have brown eyes. COMPLETE DOMINANCE. If you have an incompletely dominant gene for white in a flower and one for red in the same flower, BOTH colors will be expressed and you will have a pink flower. INCOMPLETE DOMINANCE.
How does hemophilia progress?
Hemophilia is a recessive allele condition. Men can get hemophilia alot easier than women as the allele is found on the XY Chomosome pair. With men. they do not have the extra "tail" on the Y chromosome compared to the XX with a female. If the person has the recessive allele on the X chromosome and this person is male, they will be a hemophiliac as they do not have a 'pair' allele which could be dominant to stop the condition expressing itself. On a female, if there is a recessive (hemophilia) allele on one of the X chromosomes but on the other is a Dominant (normal) allele then she will be a carrier of the faulty gene but will not suffer from the condition herself. If the female have a recessive (faulty) gene on each of the XX chromosomes, then she will be a sufferer of the disease.
Why are most mutations recessive?
Mutations are changes in the DNA. A mutation can change a gene slightly, giving a different allele. The new allele can code for a slightly different protein. If the normal allele codes for an active enzyme, the new allele may still code for the same active enzyme, may code for an inactive protein, or may code for an active enzyme that catalyzes a different reaction. Of these options, coding for the same active enzyme may be the most common, but then we don't usually notice there's been a mutation. Coding for an inactive protein is the next most likely outcome. So, most of the time when there is a mutation that produces any noticeable effect at all, it produces an allele that codes for an inactive protein. A heterozygote Aa produces some active enzyme and some inactive protein. Most often, one "dose" of active enzyme catalyzes the normal reaction enough to produce a normal appearance, so we say that the allele A is dominant, and the mutant allele a is recessive. There are plenty of exceptions. Certain types of dwarfism in humans are caused by a dominant mutant allele, for instance. Still, it's probably true that the majority of mutant alleles are recessive.
Why did only about one fourth of mendel's f2 plants exhibit the recessive traits?
Because the possible combinations are DD, Dr, rD, and rr. When a dominant gene is present (D), then that gene is selected. The plants only have a one in four chance of getting a rr combo (r being recessive). It must inherit two recessive genes to display that trait.
Under what condition can a female acquire an X recessive disorder?
Both X chromosomes must carry the recessive trait. Since males only have one X chromosome, it is much easier for males to have the recessive phenotype. Put another way, a female would have to receive an X chromosome with the recessive gene from both parents, which would mean the father already displays the recessive disorder.
Why did Mendel use peas for his studying of heredity?
Pea plants can only be either white or purple. In other words, there was no 'in between' color. This made it easier for Mendel to conclude that some genes are dominant (purple flower) and others are recessive (white flower).
