0
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.
What else can I help you with?
How is a recessive alle different from a dominant allele?
its different because adominant allele is in charge
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.
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!
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 is tongue folding dominant?
The ability to fold the tongue is not necessarily a dominant genetic trait. It is largely determined by the specific combination of genes inherited from both parents, known as a polygenic trait. Some people may have inherited a combination of genes that makes tongue folding easier for them, while others may not have this trait even if their parents do.
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
Which are differences between dominant and codominant marker?
Dominant markers show only the dominant allele and mask the recessive allele, while codominant markers show both alleles separately. With dominant markers, heterozygotes can't be distinguished from homozygous dominant individuals, while with codominant markers, heterozygotes display a distinct phenotype from homozygous individuals. Dominant markers are easier to interpret but may not provide as much information as codominant markers.
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
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.
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.
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 "
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.
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!
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.
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.
What is the difference a gene and an allele?
A gene is a part of the DNA. Alleles on the other hand refer to different versions of the same gene. There are other more subtle differences between the two and this is what we are going to explore on this page:Genes are the different parts of the DNA that decide the genetic traits a person is going to have. Alleles are the different sequences on the DNA-they determine a single characteristic in an individual.Another important difference between the two is that alleles occur in pairs. They are also differentiated into recessive and dominant categories. Genes do not have any such differentiation.An interesting difference between alleles and genes is that alleles produce opposite phenotypes that are contrasting by nature. When the two partners of a gene are homogeneous in nature, they are called homozygous. However, if the pair consists of different alleles, they are called heterozygous. In heterozygous alleles, the dominant allele gains an expression.The dominance of a gene is determined by whether the AA and Aa are alike phenotypically. It is easier to find dominants because they express themselves better when they are paired with either allele.Alleles are basically different types of the same gene. Let's explain this to you in this way- If your eye color was decided by a single gene, the color blue would be carried by one allele and the color green by another. Fascinating, isn't it?All of us inherit a pair of genes from each of our parents. These genes are exactly the same for each other. So what causes the differences between individuals? It is the result of the alleles.The difference between the two becomes more pronounced in the case of traits. A trait refers to what you see, so it is the physical expression of the genes themselves. Alleles determine the different versions of the genes that we see. A gene is like a machine that has been put together. However, how it will works will depend on the alleles.Both alleles and genes play an all important role in the development of living forms. The difference is most colorfully manifest in humans of course! So next time you see the variety of hair color and eye color around you, take a moment and admire the phenomenal power of both the gene and the allele!Summary:1. Genes are something we inherit from our parents- alleles determine how they are expressed in an individual.2. Alleles occur in pairs but there is no such pairing for genes.3. A pair of alleles produces opposing phenotypes. No such generalization can be assigned to genes.4. Alleles determine the traits we inherit.5. The genes we inherit are the same for all humans. However, how these manifest themselves is actually determined by alleles!
