0
A lethal allele is maintained in population for example when you use bug spray on cockroaches there will be at least one cockroach with an allele that protects it from the bug spray, it then breeds and the allele
Is passed to it's offspring and they will also be immune to the pesticide. Those babies will most likely breed with each other when they are mature passing on the allele from both of the parents making the offspring 100% immune. It's the same concept for lethal alleles.
What else can I help you with?
A healthy individual is a carrier of a lethal allele but is unaffected by it what is the probable genotype of this individual?
The probable genotype of this individual is likely heterozygous for the lethal allele, carrying one normal allele and one lethal allele. This individual is considered a carrier because they do not show any symptoms of the lethal allele's effects.
Why are lethal dominant alleles less common than lethal recessive alleles?
Lethal dominant alleles are less common than lethal recessive alleles because individuals with lethal dominant alleles typically die before they can pass on the harmful gene to their offspring, reducing the frequency of the allele in the population. In contrast, individuals with lethal recessive alleles can carry the gene without showing symptoms, allowing the allele to persist in the population through carriers who can pass it on to their offspring.
Why are dominant alleles that cause lethal disorders less common that recessive alleles that cause lethal disorders?
A lethal dominant gene prohibits the organism from reproducing irregardless of the paired gene, so it is removed from the gene pool as soon as it appears. A lethal recessive gene, on the other hand, does not prevent reproduction unless it is paired with another lethal recessive, so it may be passed down through many generations before becoming paired and preventing reproduction.
What is the probability that a pregnancy will abort if the mother and father both carry a lethal recessive allele?
If both parents carry the trait then there is a only a 25 percent chance the pregnancy will abort but there is a 75 percent chance the child will carry the trait and that can cause abnormalities during the pregnancy and afterwards.
Why are alleles that are lethal in a homozygouse individual able to be passed on in a heterozygouse individual?
Ok, so a lethal allele is basically a gene that causes an orgnism to die. Now here is the weird part it is not inherited or expressed like every other trait as we know so far. There is one key characteristic pattern for these types of alleles and that it is is a dominant allele in an autosome that is that one of the 22 chromosomes in humans that IS NOT a sex chromosome!! Here is the wierd part -- these diseases that lethal alleles express appear later in life way after the reproductive age, so during mitosis there is no "bad gene" or mutation for the cell to either repair or go through apoptosis (cell death - kind of self abort) doesn't have time to get rid of it ... if it did natural selection would have occurred and the allele would have been eliminated during our time of evolution!! Some are recessive allele in autosome and it is very different from the dominant autosomes. For an autosomal receissive allele bother parents HAVE to be heterozygous in order for one of their children to run a one in four chance to express the disease. Where as if one parent has the dominant autosome 50 50 chance is that the offspring will express the disease...
A healthy individual is a carrier of a lethal allele but is unaffected by it what is the probable genotype of this individual?
The probable genotype of this individual is likely heterozygous for the lethal allele, carrying one normal allele and one lethal allele. This individual is considered a carrier because they do not show any symptoms of the lethal allele's effects.
Why are lethal dominant alleles less common than lethal recessive alleles?
Lethal dominant alleles are less common than lethal recessive alleles because individuals with lethal dominant alleles typically die before they can pass on the harmful gene to their offspring, reducing the frequency of the allele in the population. In contrast, individuals with lethal recessive alleles can carry the gene without showing symptoms, allowing the allele to persist in the population through carriers who can pass it on to their offspring.
Why are dominant alleles that cause lethal disorders less common that recessive alleles that cause lethal disorders?
A lethal dominant gene prohibits the organism from reproducing irregardless of the paired gene, so it is removed from the gene pool as soon as it appears. A lethal recessive gene, on the other hand, does not prevent reproduction unless it is paired with another lethal recessive, so it may be passed down through many generations before becoming paired and preventing reproduction.
A recessive lethal gene exists in a population and remains for several generations Which woman could have passed the recessive lethal allele to offspring but not have the disease herself?
a woman who is heterozygous for the gene
How do dominant lethal alleles persist in populations even though their fitness is essentially zero?
Huntington's disease, where the lethal allele expresses itself very late in an individuals life. Persons carrying the dominant lethal allele does not become aware of the disease until after their reproductive age. Thus, they pass the lethal allele to their children without knowing and the allele persists.
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.
Which evolutionary mechanisms could affect allele frequencies in a population being maintained in captivity?
Genetic drift, selection pressures imposed by captivity conditions, inbreeding, and genetic bottlenecks due to small population sizes are some evolutionary mechanisms that can affect allele frequencies in a population being maintained in captivity. These factors can lead to changes in the genetic diversity of the population over time.
What is a lethal resseive trait?
A lethal recessive trait is a genetic condition caused by a recessive allele that, when two copies are inherited (one from each parent), leads to the death of the organism before or shortly after birth. These traits prevent affected individuals from surviving to reproductive age, resulting in the elimination of the harmful allele from the population over time.
What is the probability that a pregnancy will abort if the mother and father both carry a lethal recessive allele?
If both parents carry the trait then there is a only a 25 percent chance the pregnancy will abort but there is a 75 percent chance the child will carry the trait and that can cause abnormalities during the pregnancy and afterwards.
Why are alleles that are lethal in a homozygouse individual able to be passed on in a heterozygouse individual?
Ok, so a lethal allele is basically a gene that causes an orgnism to die. Now here is the weird part it is not inherited or expressed like every other trait as we know so far. There is one key characteristic pattern for these types of alleles and that it is is a dominant allele in an autosome that is that one of the 22 chromosomes in humans that IS NOT a sex chromosome!! Here is the wierd part -- these diseases that lethal alleles express appear later in life way after the reproductive age, so during mitosis there is no "bad gene" or mutation for the cell to either repair or go through apoptosis (cell death - kind of self abort) doesn't have time to get rid of it ... if it did natural selection would have occurred and the allele would have been eliminated during our time of evolution!! Some are recessive allele in autosome and it is very different from the dominant autosomes. For an autosomal receissive allele bother parents HAVE to be heterozygous in order for one of their children to run a one in four chance to express the disease. Where as if one parent has the dominant autosome 50 50 chance is that the offspring will express the disease...
What effect does natural selection have on the frequency of a recessive lethal allele?
Perhaps not much as the recessive allele is masked in heterozygous condition. Depends on penetration and expresivity of the lethal allele, but any homozygous expression is fatal, so one can expect negative frequency selection; the freqiency is kept low by selection.
What is an fixed allele APEX?
an allele present in all members of a population- APEX
