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Analysis Of Ichthyosis
Ichthyosis is a rare hereditary skin disease with a worldwide incidence rate is around 4 per thousand. Since skin is the biggest organ of our body, ichthyosis seriously damages the normal sweat and metabolic function of the skin. Therefore the patient's skin appears at different degrees of dry peeling, keratosclerosis hardening, and the skin is covered with brown scale, which is common in human limbs. Those severe patients with thickening dark scale and full of the whole body, which seriously affects not only the normal life but also even the metabolism of kidney and other organs, also do harmful to the health of those severe patients.
Achondroplasia is typically caused by a spontaneous mutation in the FGFR3 gene, resulting in a dominant form of inheritance. This means that an individual only needs to inherit one copy of the mutated gene from either parent to develop the condition.
Achondroplasia is an autosomal dominant condition. This means that an achondroplasic child can be born from one of the three possible ways. The first is if one of the parents has the disorder and the other is a big person. In this case there is a fifty percent chance that the child will be born a little person and a fifty percent chance that it will be born a big person. If both parents are little people they would have also have a fifty percent chance of having an achondroplasic child. However they would only have a twenty five percent chance of having a big person. The other twenty five percent would be born homozygous dominant. These children are said to have homozygous achondroplasia. This condition is almost always lethal in the first year of life and virtually all are spontaneously aborted at birth. The last possible way of having a child with this disorder is when two big people give birth to a little person. Seventy five percent of the little people living today came about due to this process. This process is known as a new mutation and occurs when the sperm is somehow develops into carrying the achondroplasic allele. Once this happens it is just as if one of parents is carrying the gene
Works Cited 1. Achondroplasia, http://Yahoo.com/health/Diseases_and_Conditions/Disease_feed_Data/achondroplasia. 2. Achondroplasia, The Human Growth Foundation, 1996, http://www2.shore.net/~dkennedy/dwarfism_hgfachom.html. 3. Achondoplasia, Greenburg Center for Skeletal Dysplasias, http://www.med.jhu.eduGreenberg.Center/achon.htm.
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When does a recessive trait dominant over a dominant trait?
A recessive trait cannot be dominant over a dominant trait. Dominant traits are always expressed over recessive traits in heterozygous individuals because they mask the expression of the recessive trait.
Which form of gene pair is expressed when both dominant and recessive are present?
In a situation where both a dominant and recessive allele are present in a gene pair, the dominant allele will be expressed phenotypically. The presence of a dominant allele overrides the expression of the recessive allele.
What is dominant recessive?
Dominant and recessive are terms used to describe how a particular allele (gene variant) is expressed in an individual's phenotype. A dominant allele will be expressed even if only one copy is present, while a recessive allele needs two copies to be expressed. Dominant traits mask the expression of recessive traits in an organism.
What is allele masked by the dominant allele?
An allele that is masked by the dominant allele is called a recessive allele. When an individual has one dominant allele and one recessive allele, only the trait determined by the dominant allele will be expressed. The recessive allele will only be expressed if an individual has two copies of it (homozygous recessive).
What is the different between dominant and recessive?
Dominant traits are expressed when an individual carries at least one copy of the dominant allele, while recessive traits are expressed only when an individual carries two copies of the recessive allele. Dominant alleles mask the expression of recessive alleles in heterozygous individuals.
What can be dominant or recessive?
Alleles can be dominant or recessive
Is melanoma dominant or recessive?
is malignant melanoma dominant or recessive
What is the difference dominant and recessive trait?
Dominant traits are the traits that mask the recessive traits. The dominant traits are stronger than recessive!
Is a situation in which a dominant allele completely masks a recessive allele for a gene.?
If you have 2 dominant alleles, the gene will be dominant, if you have 2 recessive alleles, the gene will be recessive. But if you have 1 recessive and 1 dominant, the Dominant allele will mask the recessive one.
How do you xxplain dominant and recessive?
Recessive
Is AAA recessive or dominant?
recessive
When does a recessive trait dominant over a dominant trait?
A recessive trait cannot be dominant over a dominant trait. Dominant traits are always expressed over recessive traits in heterozygous individuals because they mask the expression of the recessive trait.
What is achondroplasia's karyotype?
Achondroplasia is caused by a mutation in the FGFR3 gene and is not related to a specific karyotype. It is inherited in an autosomal dominant pattern, and individuals with achondroplasia typically have a normal karyotype (46 chromosomes in humans).
Which form of gene pair is expressed when both dominant and recessive are present?
In a situation where both a dominant and recessive allele are present in a gene pair, the dominant allele will be expressed phenotypically. The presence of a dominant allele overrides the expression of the recessive allele.
Is restless leg dominant or recessive?
is restless leg syndrome dominant or recessive
Is arthritis dominant or recessive?
it is dominant
What is dominant recessive?
Dominant and recessive are terms used to describe how a particular allele (gene variant) is expressed in an individual's phenotype. A dominant allele will be expressed even if only one copy is present, while a recessive allele needs two copies to be expressed. Dominant traits mask the expression of recessive traits in an organism.
