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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.
How does the punnett squares make it easier to predict the genotype and phenotype?
Punnett squares simplify the prediction of genotypes and phenotypes by visually organizing the possible combinations of alleles from two parent organisms. By mapping the alleles on a grid, it becomes easy to see the likelihood of offspring inheriting specific traits. This tool helps in understanding inheritance patterns, such as dominant and recessive traits, making it clearer how genetic variations can manifest in the offspring. Overall, Punnett squares provide a straightforward method for anticipating genetic outcomes in breeding scenarios.
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 are the punnet diagrams important in mapping genetic crosses?
Punnett squares are essential tools in genetics for predicting the probability of offspring inheriting particular traits from their parents. They visually represent the possible combinations of alleles from each parent, allowing researchers and breeders to determine the likelihood of specific genotypes and phenotypes in the offspring. This visualization aids in understanding inheritance patterns, such as dominant and recessive traits, making it easier to study genetic variation and predict outcomes in breeding programs.
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
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.
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.
How does the punnett squares make it easier to predict the genotype and phenotype?
Punnett squares simplify the prediction of genotypes and phenotypes by visually organizing the possible combinations of alleles from two parent organisms. By mapping the alleles on a grid, it becomes easy to see the likelihood of offspring inheriting specific traits. This tool helps in understanding inheritance patterns, such as dominant and recessive traits, making it clearer how genetic variations can manifest in the offspring. Overall, Punnett squares provide a straightforward method for anticipating genetic outcomes in breeding scenarios.
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.
What are the punnet diagrams important in mapping genetic crosses?
Punnett squares are essential tools in genetics for predicting the probability of offspring inheriting particular traits from their parents. They visually represent the possible combinations of alleles from each parent, allowing researchers and breeders to determine the likelihood of specific genotypes and phenotypes in the offspring. This visualization aids in understanding inheritance patterns, such as dominant and recessive traits, making it easier to study genetic variation and predict outcomes in breeding programs.
