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Does sickle cell disease require two allele or multiple alleles?
Sickle cell disease is an autosomal reccessive sexlinked trait so, a female msut have 2 recessive alleles to have the trait and a male needs only one allele (this is because there is no corresponding site for this allele on the Y chromosome. The female can be a carrier of the disorder with the defective allele on one X chromosome and a normal allele on the other X chromosome. Female carrriers can have a mixture of normal and abnormal redblood cells.
Why are recessive phenotypes so rare?
Recessive phenotypes are rare because they require two copies of the recessive allele to be expressed, which means both parents must carry the allele for the phenotype to be observed in offspring. If the allele is rare in the population, the likelihood of two carriers mating is low. Additionally, dominant alleles often overshadow recessive ones, leading to greater expression of dominant traits. As a result, recessive traits persist at lower frequencies in the gene pool.
Why are all white eyed flies males?
All white-eyed flies are males due to a genetic mutation linked to the X chromosome. In Drosophila melanogaster, the white eye color trait is caused by a recessive allele located on the X chromosome. Since males have only one X chromosome (XY), any mutation on that chromosome will manifest, resulting in white eyes. In contrast, females have two X chromosomes (XX) and would require two copies of the recessive allele to exhibit white eyes, making it rare for females to show this trait.
Dominant and recessive traits?
In genetics, dominant traits are those that are expressed in an individual's phenotype when only one copy of the allele is present, while recessive traits require two copies of the allele to be expressed. Dominant alleles are represented by a capital letter (e.g., 'A'), while recessive alleles are represented by a lowercase letter (e.g., 'a'). The expression of dominant or recessive traits follows Mendel's laws of inheritance.
Is a disorder know as a dominant or recessive?
A disorder can be either dominant or recessive, depending on the specific genetic inheritance pattern. Dominant disorders only require one copy of the mutated gene to be expressed, while recessive disorders require two copies.
A trait that requires one allele in order to in order to show up in the phenotype?
Recessive traits require two recessive alleles.
Does sickle cell disease require two allele or multiple alleles?
Sickle cell disease is an autosomal reccessive sexlinked trait so, a female msut have 2 recessive alleles to have the trait and a male needs only one allele (this is because there is no corresponding site for this allele on the Y chromosome. The female can be a carrier of the disorder with the defective allele on one X chromosome and a normal allele on the other X chromosome. Female carrriers can have a mixture of normal and abnormal redblood cells.
Why are recessive phenotypes so rare?
Recessive phenotypes are rare because they require two copies of the recessive allele to be expressed, which means both parents must carry the allele for the phenotype to be observed in offspring. If the allele is rare in the population, the likelihood of two carriers mating is low. Additionally, dominant alleles often overshadow recessive ones, leading to greater expression of dominant traits. As a result, recessive traits persist at lower frequencies in the gene pool.
Why is it difficult to determine the genotype of an organism that has a dominant phenotype?
NO, because a dominant phenotype could either be homozygous or a heterozygous.so unless you are sure about the genotype of parents we can't determine it...but we can determine the genotype of a person showing reccessive phenotype, as a recessive trait always expresses itself in a homozygous condition...
Why are all white eyed flies males?
All white-eyed flies are males due to a genetic mutation linked to the X chromosome. In Drosophila melanogaster, the white eye color trait is caused by a recessive allele located on the X chromosome. Since males have only one X chromosome (XY), any mutation on that chromosome will manifest, resulting in white eyes. In contrast, females have two X chromosomes (XX) and would require two copies of the recessive allele to exhibit white eyes, making it rare for females to show this trait.
Dominant and recessive traits?
In genetics, dominant traits are those that are expressed in an individual's phenotype when only one copy of the allele is present, while recessive traits require two copies of the allele to be expressed. Dominant alleles are represented by a capital letter (e.g., 'A'), while recessive alleles are represented by a lowercase letter (e.g., 'a'). The expression of dominant or recessive traits follows Mendel's laws of inheritance.
Is a disorder know as a dominant or recessive?
A disorder can be either dominant or recessive, depending on the specific genetic inheritance pattern. Dominant disorders only require one copy of the mutated gene to be expressed, while recessive disorders require two copies.
Why are dumpy wings recessive or dominant trait?
Dumpy wings in fruit flies are a recessive trait. This means that an individual must inherit two copies of the dumpy wing allele (one from each parent) in order to exhibit the dumpy wing phenotype. Dominant traits, on the other hand, only require one copy of the allele to be expressed. In the case of dumpy wings, the presence of the wild-type allele (normal wings) masks the expression of the dumpy wing allele, making it recessive.
Why do females with turner syndrome have a similar incidence of color blindness as males?
Turner Syndrome is a condition where one of the sex chromosomes (X or Y) is missing. In girls this means that they only have one copy of the X chromosome, the same as men have. Color blindness is a recessive condition coded for by the X chromosome. This means that men only need one copy of the 'color blindness' mutation (as they have one X and one Y chromosome) where as girls would require two (a unmutated form of the gene on either X chromosome would mean that it was not expressed due to its recessive nature) In turners there is only one X chromosome for girls, this means that they only require one copy of the mutated gene to express the condition, the same criteria as men
Are human limb mutations dominant or recessive?
Human limb mutations can be either dominant or recessive, depending on the specific gene involved. Typically, mutations that cause limb abnormalities are rare and can be caused by mutations in either dominant or recessive genes. Dominant mutations require only one copy of the mutated gene to be expressed, while recessive mutations require both copies to be mutated for the trait to be expressed.
What is the type of trait that can be masked?
The type of trait that can be masked is known as a recessive trait. In genetics, recessive traits require two copies of the recessive allele (one from each parent) to be expressed phenotypically, while a dominant allele can overshadow or mask the expression of the recessive allele. As a result, individuals with one dominant and one recessive allele will display the dominant trait, concealing the presence of the recessive trait.
What colors are recessive?
In genetics, recessive traits are those that require two copies of a recessive allele for the trait to be expressed. For example, in humans, the allele for blue eyes is recessive to the allele for brown eyes. Similarly, in plants, a recessive flower color might be white, while the dominant color could be purple. The specific colors considered recessive can vary depending on the species and the traits being examined.
