She is a carrier of hemophilia but does not have the condition
She is a carrier of hemophilia but does not have the condition
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An allele is one particular form of a gene. A large population of living things typically have several different allele for any particular gene. For example, one important gene in humans determines blood type compatibility. That gene comes in 3 different alleles -- A, B, and O. Most plants and animals are diploid -- they have 2 of each gene, one inherited from each parent. For example, any one human has one of six possible genotypes for that gene: AA, BB, OO, AB, AO, BO. A recessive allele seems to disappear when paired with a dominant allele. If something has a dominant and recessive allele, the dominant will overshadow the recessive, but the recessive will still be there (just not showing). For example, the O allele is recessive when paired with the A allele, which is dominant, and so humans with the AO genotype as well as the AA genotype have "type A blood". Only humans with the OO genotype show "type O blood". According to the Wikipedia "allele" article, some people once thought that all genes had only one "normal" allele, which was both common and dominant, and all other versions of that gene (all other alleles) were rare and recessive. However, most genes have many different "normal" alleles, whose frequencies vary from one population to another. With some genes, the most common allele is recessive.
I think it is Dominant and recessive.
The term allele is different from a genotype because an allele can be singular, but the alleles that an individual (diploid organism) has at a certain locus are called a genotype.
Genes that come together with different alleles are called _____.
Not necessarily. I think the dominant genes are more common, but there are lot of exceptions out there. For example, having six fingers in humans is a dominant gene, but it isn't all that common.
Autosomal recessive alleles ( both males and females) and X-linked alleles in females always express themselves in homozygous condition. On other hand, X -chromosome linked recessive allele express singly in males.
An allele is one particular form of a gene. A large population of living things typically have several different allele for any particular gene. For example, one important gene in humans determines blood type compatibility. That gene comes in 3 different alleles -- A, B, and O. Most plants and animals are diploid -- they have 2 of each gene, one inherited from each parent. For example, any one human has one of six possible genotypes for that gene: AA, BB, OO, AB, AO, BO. A recessive allele seems to disappear when paired with a dominant allele. If something has a dominant and recessive allele, the dominant will overshadow the recessive, but the recessive will still be there (just not showing). For example, the O allele is recessive when paired with the A allele, which is dominant, and so humans with the AO genotype as well as the AA genotype have "type A blood". Only humans with the OO genotype show "type O blood". According to the Wikipedia "allele" article, some people once thought that all genes had only one "normal" allele, which was both common and dominant, and all other versions of that gene (all other alleles) were rare and recessive. However, most genes have many different "normal" alleles, whose frequencies vary from one population to another. With some genes, the most common allele is recessive.
carriers
I think it is Dominant and recessive.
'Genotype determinants' are just another set of words to describe alleles, because an allele is what determines your genes. An allele is basically an alternative forms of a gene. Humans have 2 forms (2 alleles) for each gene (except in sex cells) one from your mom, one from your dad. The allele occupies a fixed position (locus) on the chromosome and, depending on whether or not it is dominant or recessive, it determines the phenotypes- or how the gene will be physically expressed. A Example of recessive alleles: widows peak- you need two 'widows peak' alleles to have that feature physically expressed. If you have 1 widows peak allele and another for 'no widows peak' then the dominant form will be expressed, in this case it means you will not have a widows peak.
In classic genetics: AA or Aa for autosomal dominance; for sex-linked dominance, females will need XX or Xx, while males will need Xy It gets more complicated with epistasis and other factors that modulate the genes.
The term allele is different from a genotype because an allele can be singular, but the alleles that an individual (diploid organism) has at a certain locus are called a genotype.
Genes that come together with different alleles are called _____.
No. For example, the six-finger allele is dominant over the five-finger allele in humans, yet you see almost nobody with six fingers, because it has such a low frequency. It all depends on the allele frequency in a given population.
Each person has two alleles for their blood type, one dominant and one recessive. Except for type AB blood where the alleles are co-dominant. The allele for O blood is always recessive when paired with either an A or B allele.
Not necessarily. I think the dominant genes are more common, but there are lot of exceptions out there. For example, having six fingers in humans is a dominant gene, but it isn't all that common.
In humans the allele for light hair is recessive.