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What is necessary for an xx female to express a recessive sex-linked trait?
Wiki User
∙ 13y ago
Two recessive genes or alleles. That is the only way to show any recessive trait
Wiki User
∙ 13y ago
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In the family tree below people with the recessive trait of attached earlobes are shaded gray.?
a male with one recessive allele
Is blonde hair recessive or dominant?
Recessive gene of X chromosome. more common in men as they have only one x chromosome but in female there are 2 X chromosome. If one of X chromosome in female has this recessive gene, they become a carrier. If both the X chromosome in female has this gene, they show baldness
Under what condition can a female acquire an X recessive disorder?
Both X chromosomes must carry the recessive trait. Since males only have one X chromosome, it is much easier for males to have the recessive phenotype. Put another way, a female would have to receive an X chromosome with the recessive gene from both parents, which would mean the father already displays the recessive disorder.
What are two forms that a gene or allele may take?
A gene or allele may take a dominant form, or a recessive form. If the allele is recessive, the characteristic which is coded for will be exhibited only if both the gene from the male and the gene from the female is recessive. Only one copy of a dominant allele is required to cause expression of the dominant characteristic
What is the genotype of a white eyed female fruit fly?
The white eyed female fruit fly has two recessive traits for eye color. The genotype would be xx for example.
How often do you get a yellow puppie with a yellow male lab and a black female lab?
If the female carries the recessive gene necessary for yellow coloring, about 50% of the time. If she does not, never.
If a daughter expresses an x-linked recessive gene she inherited the trait from?
For a female to express an X linked recessive gene, she must have inherited it from both parents. Every female (without disease) has two X chromosomes: XX, while males have an X and a Y: XY. A recessive gene is one that will not be expressed if there is a copy of the dominant gene present. sex linked genes have their own special set of rules because the sex chromosomes are the only ones which vary by presence or absence between different people. Because a male only has one X chromsome, he will express all the genes on that chromosome; this can be used to determine if a gene is sex linked and recessive/dominant. A recessive gene will not be expressed if there is a dominant gene for that allele present. This means that if a female (XX) is expressing an x-linked recessive trait, she must have two recessive genes for that trait; therefore she inherited the trait from both parents.
In the family tree below people with the recessive trait of attached earlobes are shaded gray.?
a male with one recessive allele
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.
Is blonde hair recessive or dominant?
Recessive gene of X chromosome. more common in men as they have only one x chromosome but in female there are 2 X chromosome. If one of X chromosome in female has this recessive gene, they become a carrier. If both the X chromosome in female has this gene, they show baldness
Can a person be a carrier for a dominant genetic disorder?
Anyone can be a carrier of a recessive genetic disorder (as long as it is not associated with the sex chromosomes) no matter what their gender since "carrier" refers to an individual that is heterozygous for the recessive allele and therefore phenotypically normal. Specifically, sexlinked genetic disorders can be "carried" by a heterozygous female but males (having only one X chromosome) cannot. Males will either be free of the defective gene or be affected.
How do you express sex linked genes?
Let's take red-green color vision as an example. You could use the letter n to represent the dominant and recessive alleles. You could use a capital letter N to represent the normal allele, which is dominant, and a lowercase letter n to represent the defective allele, which is recessive. The genotypes for the sex-linked trait would be as follows: female, homozygous dominant: XNXN; female, heterozygous: XNXn; male dominant, XNY; male recessive, XnY.
Who is a person that is a carrier for a sex-linked recessive disorder?
Usually female.
Under what condition can a female acquire an X recessive disorder?
Both X chromosomes must carry the recessive trait. Since males only have one X chromosome, it is much easier for males to have the recessive phenotype. Put another way, a female would have to receive an X chromosome with the recessive gene from both parents, which would mean the father already displays the recessive disorder.
If you mated a black female dog and a black male dog and one puppy came out yellow which color is the recessive gene?
The yellow is recessive.
Why do a man with AB blood and a female with A blood have a offspring with B blood?
The female would have to have the blood genotype of AO. The recessive O is masked by the female with the domaint A allele. Their offsprings genotype would be BO the B would be from the father and the recessive O from the mother.
What happens to a characteristic when there is only one recessive allele?
when the allele is on the Y chromosome in the female
