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Why can a person have one copy of the CF allele and be perfectly normal?
Wiki User
∙ 11y ago
CF is recessive, and as such, the gene for non-CF is dominant over this gene. The CF gene will only be expressed in the phenotype and as a characteristic if the person has two of the recessive alleles.
Wiki User
∙ 11y ago
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How is a recessive allele from a dominant allele?
its different because adominant allele is in charge
How do you know that a pea plant with wrinkled seeds does not have one copy of the round seed allele?
The trait associated with the allele is not expressed in heterozygotes.
A gene on the female chromosome having no allelic partner on the y chromosome would be what?
An individual (male) with an allele on the X chromosome but no corresponding allele on the Y chromosome is described as hemizygous. Genes which are inherited in this way are described as sex-linked or X-linked. An example is hemophilia - the inability of the blood to clot. It is caused by a recessive allele, so males only need to inherit one copy to develop the characteristic. Females can inherit one hemophilia allele and one normal allele, so they can act as carriers of the disease without developing it themselves. See http://en.wikipedia.org/wiki/X-linked_gene
What is expressed when neither copy of an allele completely masks expression of the other but instead a bending of alleles is seen?
incomplete dominance
What is it called when neither copy of an allele completely masks expression of the other but instead a blending of alleles is seen?
i think its codominance
How is a recessive allele from a dominant allele?
its different because adominant allele is in charge
What is null allele?
A null allele is a mutant copy of gene that completely lacks that gene's normal function. This can be the result of the complete absence of the gene product (protein, RNA) at the molecular level, or the expression of a non-functional gene product. At the Phenotypic level, a null allele is indistinguishable from a deletion of the entire locus.
How do you know that a pea plant with wrinkled seeds does not have one copy of the round seed allele?
The trait associated with the allele is not expressed in heterozygotes.
Do all frame overo horses carry one lethal gene?
The Overo allele is only lethal when the foal inherits a copy from both parents. A heterozygous foal is a normal frame overo.
For a gene with its locus on the X chromosome what term do you use to describe a male that only has one copy of this gene?
Hemizygous - has 1/1 copy of the allele Heterozygous - has 1/2 copies of the alleleHomozygous - has 2/2 copies of the allele
What is true of sex linked alleles'?
A female with one copy of the allele will be a carrier, but not have the disorder.
Is it true that a male with one copy of the allele will be a carrier of sex-linked alleles but not have the disorder?
No.
Is cystic fibrosis controlled by a dominant allele or by a recessive allele?
It is controlled by a recessive allele. The gene encodes a chloride ion channel that is required to make sweat, mucus and a few other things. One copy of the gene is sufficient to prevent cystic fibrosis, and it is only when both copies are defective that the person would have the disease and show symptoms.
Each copy of a gene is called an allele?
yes, different forms of a gene is called an allele. It was used in the early days of genetics to describe variant forms of a gene detected as different phenotypes
Under what condition is a single recessive allele expressed in a male?
Recessive alleles are expressed if there is no dominant allele (of the same gene) present. This can be for two reasons, because the other allele is also recessive, or because there is no other allele (such as X-linked genes, which males only have one copy of).
In biology an individual who has one copy of a recessive autosomal allele that causes disease in the homozygous condition?
carrier
Which allele is expressed even if only one copy is present in genotype?
dominant alleles
