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Why does a sex-linked trait only require one recessive allele on the X chromosome of a male to show the phenotype?
Wiki User
∙ 12y ago
because the male only inherits one X chromosome (from his mother), his other sex chromosome is Y (from his father)
Wiki User
∙ 12y ago
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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 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
Comapre and contrast dominant and recessive traits?
Dominant traits only require one allele to be present in order for the trait to be expressed, while recessive traits must have both alleles present in order for the trait to be expressed.
Is usher syndrome dominant or recessive?
I am a senior medical sicentist and work with retinal disease. Usher Syndrome is a recessive disease. Recessive diseases require two 'mistakes' in a single gene for a patient to manifest the disease. A dominant disease requires only one 'mistake' in a single gene to manifest the disease. X-linked diseases require a single mistake on the x chromosome. In any case, Usher is recessive. If you have usher, it is likely that you inherited one mistake from you mother and one mistake from your father (they don't manifest the disease themselves as they only have one mistake in the gene, not two). Of course it is also possibloe that you inheirited one mistake from your mother or your father, and the second 'mistake' that you have (if it is yourself with usher) is a new mutation (called a germ line mutation) that originated in the sperm or egg that created you. To all those people out there who post replies....please do not reply unless you know what you are talking about. Misinformation could be dangerous.
How do dominate traits over power the recessive?
dominates it (you get the dominant form)
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 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 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
Does the organism having only one chromosome require the machinery needed for the distribution of chromosomes?
Yes.
Comapre and contrast dominant and recessive traits?
Dominant traits only require one allele to be present in order for the trait to be expressed, while recessive traits must have both alleles present in order for the trait to be expressed.
Is usher syndrome dominant or recessive?
I am a senior medical sicentist and work with retinal disease. Usher Syndrome is a recessive disease. Recessive diseases require two 'mistakes' in a single gene for a patient to manifest the disease. A dominant disease requires only one 'mistake' in a single gene to manifest the disease. X-linked diseases require a single mistake on the x chromosome. In any case, Usher is recessive. If you have usher, it is likely that you inherited one mistake from you mother and one mistake from your father (they don't manifest the disease themselves as they only have one mistake in the gene, not two). Of course it is also possibloe that you inheirited one mistake from your mother or your father, and the second 'mistake' that you have (if it is yourself with usher) is a new mutation (called a germ line mutation) that originated in the sperm or egg that created you. To all those people out there who post replies....please do not reply unless you know what you are talking about. Misinformation could be dangerous.
How do dominate traits over power the recessive?
dominates it (you get the dominant form)
Can child have o type blood from AB mother and A father?
No. For the child to have a phenotype of O, they require an oo genotype. As the mother cannot provide one O to this, this is not possible.
How are dominant and recessive different?
Two genes determine a trait, e.g. eye colour (i will use eye colour as my example).You get one gene from your mother, and one gene from your father. Different genes may be dominant or recessive. In eye colour, Blue is a recessive trait and brown ia a dominant trait.That means that in the case of receiving a blue gene from your mother, and brown gene from your father, you will have brown eyes as it is dominant, as you only require ONE gene to show that trait, (although you may have two). However, you have to have BOTH recessive genes to have the recessive trait, meaning you have to be heterogenous for the gene.Hope that helped :)
What is continuous cell lines?
The cells are immortal, fast-growing but require only simple media. These cells have undergone transformation and have great chromosomal instability as well as divergence of phenotype.
How are dominant and recessive traits different?
A dominant trait is the trait that will show. A recessive trait is the trait that is hidden. For example if your mom had brown eyes and your dad has green eyes you would have brown eyes because brown eyes are the dominant trait
