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How long will it take to remove the dominant alleles from the population?
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What letters represent the alleles?
Dominant AllelesUsually dominant alleles are represented as capital letters, whereas recessive alleles are represented by the lowercase letter. Presumably, the capital letter will help you remember which is which -- dominant correlates with capital. However, you can assign alleles whatever letter, number, or symbol you want - as long as it produces the same genotype and phenotype ratio. The symbols/letters that are created for Punnett Squares or another process are purely for organizational purposes. Think of it this way: if you have a heterozygous organism that mates with a homozygous organism of the same species, how will you find the genotypes and phenotypes of the offspring? Well, you certainly aren't going to figure it out abstractly in your head. Assigning letters to dominant/recessive alleles is just to keep track of where the alleles are possibly going and the results. If you want the dominant allele to be "R" and the recessive allele to be "r", then that's perfectly acceptable. And if you want to represent the dominant allele with a Batman symbol and the recessive allele with a radioactive symbol, then that's fine too... as long as you know that the Batman symbol represents the dominant allele and the radioactive allele the recessive.
How can a lethal allele continue to be present in a gene pool even when they are selected against?
A harmful recessive allele remains in the population because both homozygous dominant and heterozygous genotypes produce the dominant, healthy phenotype. So the heterozygous genotype keeps the harmful recessive allele in the population.
What phenotype frequency in a population changes after each generation. What would most likely be causing this?
In population genetics the frequency of individual alleles remain constant as long as alleles are neither selected for or against. Phenotypic frequency varies based on the relative frequency of the various dominant and recessive alleles in the population. Further, if selection is taking place phenotype will tend to change in the direction of the allele selected. If the population is small enough there is also the factor of genetic drift, which can change phenotype in one direction within a few generations. Populations are certainly being acted on and alleles selected whether they are obvious phenotypically...if these traits are linked with ones that are visually apparent the change will manifest phenotypically but the change occurs because of linkage to the selected trait as opposed to by selection for the phenotypically obvious one. Some traits give an advantage.
Are dominant or recessive alleles easier to remove by selection?
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 evidence is there that long and round alleles did not become blended?
wumbology
What letters represent the alleles?
Dominant AllelesUsually dominant alleles are represented as capital letters, whereas recessive alleles are represented by the lowercase letter. Presumably, the capital letter will help you remember which is which -- dominant correlates with capital. However, you can assign alleles whatever letter, number, or symbol you want - as long as it produces the same genotype and phenotype ratio. The symbols/letters that are created for Punnett Squares or another process are purely for organizational purposes. Think of it this way: if you have a heterozygous organism that mates with a homozygous organism of the same species, how will you find the genotypes and phenotypes of the offspring? Well, you certainly aren't going to figure it out abstractly in your head. Assigning letters to dominant/recessive alleles is just to keep track of where the alleles are possibly going and the results. If you want the dominant allele to be "R" and the recessive allele to be "r", then that's perfectly acceptable. And if you want to represent the dominant allele with a Batman symbol and the recessive allele with a radioactive symbol, then that's fine too... as long as you know that the Batman symbol represents the dominant allele and the radioactive allele the recessive.
What describes the man's trait and the alleles in his sperm cells if he inherited the dominant allele from his mother and recessive allele from his father?
As long as you aren't talking about a trait or gene that behaves co-dominately or some other exception, the man would have the dominant trait show up and his alleles would be dominant and recessive (or Dd if you are using letter symbols for the alleles- upper case being the dominant allele from the mom's egg and lower case for the recessive allele from the dad's sperm). So for example if we are talking about the gene for earlobes we can use the letter E to represent the two alleles or genetic variations: E for un-attached earlobes and e for attached earlobes. A sex cell (sperm or egg) has one allele each so that when they unite to make an embryo the new person has 2 alleles- one from each parent. So if the man inherited a dominant allele E from his mom and a recessive allele e from his father then he would have Ee as his "genotype"(what alleles he has). His "phenotype" is what trait he shows, which would be what ever is dominant-- in this case E equals un-attached earlobes.
What does assort independently mean?
L = long hair ; l = short hairS = white spotted ; s=not white spottedthis example shows that the long hair and white spots alleles are dominant, and short hair and not spotted are not dominate.assorted independence means that there are two alleles one will always be dominate.example Ll or Ss
In watermelons the genes for green colour and short shape are dominant over their alleles for striped colour and long shape If a plant with long striped fruit is crossed with a plant heterozygous f?
Ryan Jones is not not not cool
How can a lethal allele continue to be present in a gene pool even when they are selected against?
A harmful recessive allele remains in the population because both homozygous dominant and heterozygous genotypes produce the dominant, healthy phenotype. So the heterozygous genotype keeps the harmful recessive allele in the population.
What phenotype frequency in a population changes after each generation. What would most likely be causing this?
In population genetics the frequency of individual alleles remain constant as long as alleles are neither selected for or against. Phenotypic frequency varies based on the relative frequency of the various dominant and recessive alleles in the population. Further, if selection is taking place phenotype will tend to change in the direction of the allele selected. If the population is small enough there is also the factor of genetic drift, which can change phenotype in one direction within a few generations. Populations are certainly being acted on and alleles selected whether they are obvious phenotypically...if these traits are linked with ones that are visually apparent the change will manifest phenotypically but the change occurs because of linkage to the selected trait as opposed to by selection for the phenotypically obvious one. Some traits give an advantage.
The phenotype in a population changes after each generation which would most likely be causing this?
organisms compete for shelter
A pea plant has a tall stem what are its possible genotypes-?
Is tall dominant? You didn't say. Let's assume it is. Therefore, as long as a dominant allele is one of the two alleles an organism has for every trait, and we let "R" stand for dominant tall and 'r' stand for recessive short, then either an RR or Rr genotype will result in a tall phenotype.
What does assorted mean?
L = long hair ; l = short hairS = white spotted ; s=not white spottedthis example shows that the long hair and white spots alleles are dominant, and short hair and not spotted are not dominate.assorted independence means that there are two alleles one will always be dominate.example Ll or Ss
A dominant phenotype will only be expressed if the individual is homozygous dominant for that trait?
Well actually not necessarily. An individual can be homozygous or heterozygous dominant for a trait. As long as they have that dominant allele in that specific genetic trait, they will automatically express the dominant phenotype. If a person is homozygous dominant, it just means that they will pass on both dominant traits to the offspring. If a person is heterozygous dominant , it means that they will pass on both a dominant and recessive trait to their offspring.Hope that helps ! =D
Why is such a high percentage of Indian's modern population Hindu?
Because Hinduism was established in India. And Hinduism was the dominant Religion of India since a long time.
For blood groups is it possible for an A positive mother and a B positive father to have an O positive daughter?
Yes, it is possible for an A positive mother and a B positive father to have an O positive daughter. Both A (written as IA) and B (written as IB) alleles (versions of the gene) are dominant over the O (written as i) allele. Therefore the mother could have the alleles IAi, and the father IBi If the daughter receives the i allele from both parents, she will have O type blood. Rhesus positive is dominant, so as long as one of the parents passes on a dominant allele, the daughter will also be positive.
