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Under what condition is a single recessive allele expressed in a male?
A single recessive allele will be expressed in a male if he inherits that allele on his only X chromosome, as males have one X and one Y chromosome. This is because the presence of the recessive allele on the X chromosome has no dominant allele to mask its expression.
How many copies of a sex linked recessive allele does a male need to exbit the trait?
A male only needs one copy of a sex-linked recessive allele to exhibit the trait because males have only one X chromosome. If the allele is present on the X chromosome, it will be expressed in males.
Why are traits controlled by recessive alleles on the X chromosomes are more common in males then in females?
In males, they only have one X chromosome, so if they inherit a recessive allele for a certain trait on their X chromosome, it will be expressed because there is no corresponding dominant allele on the Y chromosome to mask it. Females have two X chromosomes, so even if they inherit a recessive allele on one X chromosome, the dominant allele on the other X chromosome can mask its expression.
In one allele is dominant to a recessive allele?
In a dominant-recessive allele relationship, the dominant allele will be expressed phenotypically over the recessive allele. This means that even if an organism carries one dominant and one recessive allele for a particular trait, the dominant allele will determine the observable characteristic.
Why would recessive traits be more common on boys than girls?
Only sex-linked recessive traits on the X sex chromosome are more common in males. This is because males receive only one X chromosome, so they cannot be heterozygous for a trait on the X chromosome. Females inherit two sex chromosomes, so they can be heterozygous, receiving both a dominant and a recessive allele on the X chromosomes.
What is an individual who has a recessive disease causing allele at a particular gene on one chromosome and a normal allele at that gene on the other chromosome?
An individual with a recessive disease-causing allele on one chromosome and a normal allele on the other chromosome is referred to as a heterozygote for that gene. Since the disease is recessive, the normal allele typically masks the effects of the recessive allele, meaning the individual usually does not exhibit symptoms of the disease. However, they can still pass the recessive allele to their offspring.
What is dominant chromosome?
A dominant chromosome refers to a chromosome that carries a dominant allele, which expresses its trait even when paired with a recessive allele. In genetics, dominant alleles can mask the effects of recessive alleles in a heterozygous organism. This means that if an individual has one dominant allele for a trait, that trait will be expressed, regardless of the presence of a recessive allele. Dominance is a key concept in Mendelian genetics, influencing inheritance patterns.
Under what condition is a single recessive allele expressed in a male?
A single recessive allele will be expressed in a male if he inherits that allele on his only X chromosome, as males have one X and one Y chromosome. This is because the presence of the recessive allele on the X chromosome has no dominant allele to mask its expression.
How many copies of a sex linked recessive allele does a male need to exbit the trait?
A male only needs one copy of a sex-linked recessive allele to exhibit the trait because males have only one X chromosome. If the allele is present on the X chromosome, it will be expressed in males.
What happens to a characteristic when there is only one recessive allele?
When there is only one recessive allele present for a characteristic, the dominant allele will be expressed in the phenotype. The individual will exhibit the trait associated with the dominant allele, while still carrying the recessive allele in their genetic makeup.
Is this true or false in females a recessive allele on the X chromosome is often has no matching allele on the y chromosomes?
True. In females, who have two X chromosomes, a recessive allele on one X can be masked by a dominant allele on the other X. However, since males have one X and one Y chromosome, any recessive allele on their single X chromosome has no matching allele on the Y chromosome, making them more likely to express traits associated with those 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 genotype must the person have who possessed the recessive phenotypes?
The genotype is homozygous recessive or the recessive trait is on the X chromosome and has no corresponding allele on the Y chromosome.
Why are males more likely to get recessive sex linked disorder?
Males are more likely to get recessive sex-linked disorders because they have only one X chromosome, meaning they will display the disorder if that X chromosome carries the recessive gene. Females, on the other hand, have two X chromosomes which can often mask the presence of the disorder if one X chromosome carries a normal allele.
What type of allele is known for skipping a generation?
Recessive alleles are known for skipping a generation. This is because the phenotype associated with a recessive allele is only expressed when an individual inherits two copies of the recessive allele, one from each parent. If one parent carries the allele but does not exhibit the trait, it can appear to "skip" a generation before being expressed.
Why are traits controlled by recessive alleles on the X chromosomes are more common in males then in females?
In males, they only have one X chromosome, so if they inherit a recessive allele for a certain trait on their X chromosome, it will be expressed because there is no corresponding dominant allele on the Y chromosome to mask it. Females have two X chromosomes, so even if they inherit a recessive allele on one X chromosome, the dominant allele on the other X chromosome can mask its expression.
Why does a sex-linked trait only require one recessive allele on the X chromosome of a male to show the phenotype?
Because males have only one X chromosome, any recessive allele present on that X chromosome will be expressed in the phenotype. In females, who have two X chromosomes, the presence of a dominant allele on one X chromosome can mask the expression of a recessive allele on the other X chromosome.
