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Why are females less likely to show a trait caused by a recessive allele linked to an X chromosome?
Women have two X chromosomes, while men have an XY chromosome, therefore if the recessive allele is on the X chromosome, the man will most likely inherit the gene. While the woman has two X's, I believe because it is recessive both X's have to contain the allele. So if only one X has a recessive allele, she will not inherit it.
What else can I help you with?
Is hunters disease dominant or recessive?
Hunter's disease is inherited in an X-linked recessive pattern. This means the mutated gene that causes the disease is located on the X chromosome, and males are more commonly affected because they only have one X chromosome. Females can carry the mutated gene but are typically unaffected due to having a second X chromosome that can compensate.
What is caused by a dominant allele located on an autosome?
A dominant allele located on an autosome will be expressed phenotypically in the individual, meaning it will be visible in the physical characteristics of the organism. This dominant allele will mask the effects of any recessive allele at the same locus.
What is the phenotype of an individual with one allele for dimples and one allele for no dimples?
a example of a gene
Is alkaptonuria caused by a recessive or dominant allele?
Phenylketonuria is an autosomal recessive genetic disorder. The enzyme phenylalanine hydroxylase is necessary to metabolize phenylalanie, but when this enzyme doesnt work, phenylaline accumulates and is detected in the urine. The disease is detected during pregnancy, and if treated right away the newborn can develop normally. However, if left untreated, the brain will not develop properly.
How do dominant and recessive alleles affect an offsprings phenotype?
The traits inherited depends upon the alleles that have been passed on from the father and mother.The traits that are exhibited is called as the phenotype. Dominant allele needs only one copy to be expressed.For example in a pea plant "T" represents the tall dominant allele and "t" the short recessive allele .TT - when there are two dominant alleles the pea plant will express the tall trait. The pea plant is tall.Tt - when there is one dominant and one recessive allele the pea plant will still express the tall trait.In this case the dominant allele masks the recessive allele and the pea plant is still tall.tt - when there are two recessive alleles the pea plant will express the recessive trait and the pea plant is short.For a recessive trait to show up there should be a pair of recessive alleles.
What type of allele is responsible for causing duchenne muscular dystrophy?
Duchenne muscular dystrophy is caused by a recessive allele on the X chromosome. This means that males are more commonly affected since they only have one X chromosome. Females can carry the allele but are usually not affected due to having a second X chromosome that often carries a normal copy of the gene.
What causes birthmarks?
well some people believe a birthmark is caused by a recessive allele on the y chromosome
Is hemophilia A sex-linked?
Yes, hemophilia A is a sex-linked recessive genetic disorder caused by a mutation in the F8 gene on the X chromosome. It primarily affects males, who inherit the defective gene from their mothers. Females can be carriers of the gene and may pass it on to their children.
Sex-linked disorders are caused by males having?
Sex-linked disorders are often caused by males having only one X chromosome, as they inherit a Y chromosome from their father. This means that any recessive allele on the X chromosome, which may be associated with a disorder, will be expressed in males since there is no corresponding allele on the Y chromosome to mask its effects. Consequently, conditions like hemophilia and color blindness are more commonly observed in males than in females. Females, having two X chromosomes, may be carriers without showing symptoms if they have one normal allele.
Is hemophillia caused by a recessive allele?
yes
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
Red-green colour blindness in human is caused by an X-linked recessive allele if the trait occur in 4 of the males in a population at Hardy-Weinberg equilibriumthen the frequency of this allele is?
If 4% of males in a population have red-green color blindness, then the allelic frequency is 4% in males and in females. If mating is random, then in females, 92.16% do not carry the allele on either X chromosome, 7.68% carry the allele on one X chromosome, and 0.16% carry the allele on both X chromosomes. We have the dominant allele with frequency p and the recessive allele with frequency q, so 0.9216 + 0.0768 + 0.0016 = p^2 + 2pq + q^2 = (p + q)^2 = (0.96 + 0.04)^2
Is hunters disease dominant or recessive?
Hunter's disease is inherited in an X-linked recessive pattern. This means the mutated gene that causes the disease is located on the X chromosome, and males are more commonly affected because they only have one X chromosome. Females can carry the mutated gene but are typically unaffected due to having a second X chromosome that can compensate.
Is cystic fibrosis caused by a dominent or recessive gene?
It is caused by a recessive allele. Believe me my teacher told me.
Why is hemophilia more common in males than women?
this disease is caused by a recessive allele that is found only on the x chromosome. a human female has two x chromosomes. a human male only has 1 x chromosome. therefore, a male needs only one recessives allele to have hemophilia, while a female needs two recessive allele. as a result, hemophilia is much more common in males.
A color-blind woman mates with a male with normal color vision Which of these results would indicate that color blindness is caused by an X-linked recessive allele?
If the couple has a color-blind son, it would indicate that color blindness is caused by an X-linked recessive allele. This is because sons inherit their single X chromosome from their mother, who carries the recessive allele for color blindness but does not express it due to her second X chromosome providing the normal color vision gene.
What is the nervous system that breakdown that is caused by an autosomal recessive allele?
One example of a nervous system breakdown caused by an autosomal recessive allele is spinal muscular atrophy (SMA). SMA is a genetic disorder that leads to the loss of motor neurons in the spinal cord, resulting in muscle weakness and atrophy. It is caused by mutations in the SMN1 gene on chromosome 5.
