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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.
What else can I help you with?
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 dominant lethal allele?
Dominant lethal is a genetic trait. If the genome of an individual has the trait, it is expressed and makes it impossible for the individual to have descendants. Its effects cause foetal or embryonic death.
How can a lethal gene be passed from one generation to the other?
If the lethal gene is recessive, and the parent carrying it is heterozygous for that gene, it can be passed down to offspring in the recessive form. If the mate of the parent happens to be carrying the same gene heterozygously, 50% of offspring will be expected to inherit the recessive lethal gene heterozygously. 25% of the offspring will be expected to inherit the lethal gene homozygously, leading to death. The remaining 25% of offspring we will expect to homozygously inherit the non-lethal gene. 1:2:1 ratio
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.
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 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.
Why do you not often see dominant deadly alleles?
Lethal dominant alleles normally die before obtaining the ability to reproduce.
Why do recessive trail are more common in some cases?
They're not necessarily, but they can be. When a recessive trait is more common, it likely because it was advantageous to have that trait so the species evolved to have more of it in the gene pool. Also, since dominant traits are expressed over recessive traits, natural selection has more of an effect on them.
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.
What is dominant lethal allele?
Dominant lethal is a genetic trait. If the genome of an individual has the trait, it is expressed and makes it impossible for the individual to have descendants. Its effects cause foetal or embryonic death.
How can a lethal gene be passed from one generation to the other?
If the lethal gene is recessive, and the parent carrying it is heterozygous for that gene, it can be passed down to offspring in the recessive form. If the mate of the parent happens to be carrying the same gene heterozygously, 50% of offspring will be expected to inherit the recessive lethal gene heterozygously. 25% of the offspring will be expected to inherit the lethal gene homozygously, leading to death. The remaining 25% of offspring we will expect to homozygously inherit the non-lethal gene. 1:2:1 ratio
Are lethal alleles the traits visible in the F1 generation of true-breeding organisms?
depends if its autosomal or dominant or what. I need a little more info
Is Tay Sachs disease a dominant lethal allele?
I believe it is an autosomal recessive disorder, meaning it is only apparent with a homozygous recessive genotype. But i could be wrong (i loathe biology). oh really?
Do autosomes have lethal recessive genes?
Yes, autosomes can carry lethal recessive genes. These genes can result in lethal genetic disorders when a person inherits two copies of the mutated gene, one from each parent, causing the disorder to manifest.
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.
How many lethal genes would the typical human have if the alleles were homozygous?
A typical human would have around 1-2 lethal genes if homozygous for lethal alleles. Lethal genes are usually rare in the human population due to the negative impact on survival and reproduction.
