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Why are males affected by recessive sex-linked traits more often than females?
Wiki User
∙ 12y ago
Males more frequently express sex-linked traits because they only have one X chromosome. Since most of the genes on the sex chromosomes are on the X chromosome and very few are on the Y, so any recessive gene on the X chromosome will be expressed.
Wiki User
∙ 13y ago
Males have only one X chromosome, so if they inherit a recessive allele for a sex-linked trait, they will exhibit that trait because they lack a second X chromosome to mask the expression of the allele. In females, the presence of two X chromosomes allows for the masking of recessive alleles carried on one X chromosome by the dominant allele on the other X chromosome.
Wiki User
∙ 12y agoa male's chromosomes are XY, whereas a girls are XX. With a female, hes sex-linked traits can be dominated by her other X chromosome. Whereas with boys, their Y is what they get, there's no changing it.
Wiki User
∙ 14y agoMales have only one X chromosome, so a recessive X-linked trait will be displayed in the phenotype [visible on the outside]. Females have two X chromosomes, so both of the chromosomes must have the trait for it to be displayed on the phenotype.
Wiki User
∙ 13y ago{ Short Answer } - Because females have only one X chromosome.
Males are more likely than females to have sex-linked traits controlled by a recessive allele because they only need one recessive allele to have the sex-linked trait. In contrast, females need two recessive alleles to have the sex-linked trait, so they have a lower probability of having it.
This is best viewed with a Punnet square. Say the recessive allele that controls the sex-linked trait is Xa. XA is the dominant allele and Y is the male chromosome.
Scenario #1
If the mom is XA XA and marries a man with the sex-linked trait Xa Y, then none of the sons will have the sex-linked trait. All the daughters will have the mutant allele, but they will all be carriers with normal phenotypes since they only have one mutant allele.
Xa
Y
XA
XA Xa
Xa Y
XA
XA Xa
Xa Y
Scenario #2
If the mom is XA Xa and marries a man with the sex-linked trait Xa Y, then there is a 50% chance that each child will have the sex-linked trait, regardless of sex.
Xa
Y
XA
XA Xa
XA Y
Xa
Xa Xa
Xa Y
Scenario #3
If the mom is a carrier XA Xa and marries a normal man XA Y, then there is a 50% chance each son will have the sex-linked trait. The daughters may be carriers, but none of them will have the sex-linked trait.
XA
Y
XA
XA XA
XA Y
Xa
XA Xa
Xa Y
Scenario #4
If the mom has the sex-linked trait Xa Xa and marries a normal man XA Y, then all of the sons will have the sex-linked trait. The daughters will be carriers, but none of them will have the sex-linked trait.
XA
Y
Xa
XA Xa
Xa Y
Xa
XA Xa
Xa Y
Scenario #5
If the mom has the sex-linked trait Xa Xa and marries a man who also has the sex-linked trait Xa Y, then all of their children will have the sex-linked trait.
Xa
Y
Xa
Xa Xa
Xa Y
Xa
Xa Xa
Xa Y
As you can see, there are many more strikethrough outcomes (8) where the male has the sex-linked trait controlled by a recessive allele than bold outcomes (3) where the female has the sex-linked trait. Thus, males are more likely than females to have sex-linked traits controlled by a recessive allele.
Wiki User
∙ 12y agoFemales have two X chromosomes, whereas males only have one.
This means that if a female has one normal allele and one affected allele, the trait will not be expressed (because it is recessive, the normal trait will be expressed instead).
However, because males only have one X chromosome, if they have the affected trait, there is no normal trait on the other chromosome to cancel it out - so the trait will be expressed.
Wiki User
∙ 11y agoBecause in heterozygous conditions the female is XX, which offers statistical protection against a recessive condition traveling with the X chromosome. Males, being XY, have no such protection against receiving a recessive allele on the X chromosome.
Wiki User
∙ 13y agoBecause they olny have one X chromosome.
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Why do you sex linked traits follow different patterns of inheritance then other traits?
Males and females have different sex chromosomes.
Which traits oberved were dominant and recessive?
In genetics, dominant traits are those that are expressed when an individual has one or two copies of the dominant allele, while recessive traits are only expressed when an individual has two copies of the recessive allele and no dominant allele present. Dominant traits often mask recessive traits in heterozygous individuals.
Why are recessive disorders more common than dominant disorders?
Recessive disorders are more common than dominant disorders because carriers of recessive genes can pass on the disorder without being affected themselves. This means that individuals can carry the recessive gene without showing symptoms, leading to a higher chance of two carriers having an affected child. In contrast, dominant disorders require that at least one parent carrying the dominant gene must be affected, making them less common.
What kinds of traits seem to disappear sometimes?
Recessive Traits
Is an organism that is homozygous for many recessive traits at a disadvantage?
An organism that is homozygous for many recessive traits may be at a disadvantage due to the expression of those recessive traits. These traits may negatively impact the organism's overall fitness, making it less well-adapted to its environment compared to organisms that do not have as many recessive traits expressed.
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!
Why do you sex linked traits follow different patterns of inheritance then other traits?
Males and females have different sex chromosomes.
Why are males more likely than females to have a sex linked traits that are recessive?
Because they olny have one X chromosome.
What do organisms pass to their offspring?
They pass on traits. There are recessive traits and dominant traits. The dominant trait is normally the one that overpowers recessive
Why are traits controlled by recessive alleles on the X chromosome are more common in males than in females?
Males only have one X chromosome, so even if the gene on that chromosome is recessive there is no other gene that could dominate it. Females have two X chromosomes, so if the gene on that chromosome is recessive there is still a chance that the gene on the other chromosome could be dominate and override it.
Which traits oberved were dominant and recessive?
In genetics, dominant traits are those that are expressed when an individual has one or two copies of the dominant allele, while recessive traits are only expressed when an individual has two copies of the recessive allele and no dominant allele present. Dominant traits often mask recessive traits in heterozygous individuals.
Why are recessive disorders more common than dominant disorders?
Recessive disorders are more common than dominant disorders because carriers of recessive genes can pass on the disorder without being affected themselves. This means that individuals can carry the recessive gene without showing symptoms, leading to a higher chance of two carriers having an affected child. In contrast, dominant disorders require that at least one parent carrying the dominant gene must be affected, making them less common.
What genes are recessive traits?
These traits are called dominant traits. They will overcome the recessive gene and the dominant trait will be expressed. A recessive gene needs two alleles present in its genotype to be expressed.
Describe sex-linked traits and state the predictable modes of inheritance for traits located on the X chromosome.?
Sex-linked traits are traits that are held in the x-chromosome, Males are more than likely to than females to have to have x-linked traits due to them only having one x chromosome which makes them more vulnerable. While females need to inherit two recessive genes/alleles to have and express the condition.
What is meaning of recessive traits?
an inherited character determined by a recessive gene
What kinds of traits seem to disappear sometimes?
Recessive Traits
Are many undesirable traits in humans recessive?
Undesirable traits in humans can be caused by recessive genes, but they can also be caused by dominant or polygenic inheritance. The inheritance pattern of a trait depends on the specific genetics involved.
