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Which allele combination represents a female who has a heterozygous sex-linked trait?
A female with a heterozygous sex-linked trait typically has one dominant allele and one recessive allele for that trait. Since sex-linked traits are often associated with the X chromosome, the allele combination would be represented as XᴴXʰ, where Xᴴ is the X chromosome carrying the dominant allele and Xʰ is the X chromosome carrying the recessive allele. This combination indicates that the female expresses the dominant trait but is a carrier of the recessive trait.
If a human baby boy inherits a recessive allele from his mother in which circumstance would he most likely show the trait coded for by the recessive allele?
A human baby boy would most likely show the trait coded for by a recessive allele if he inherits the same recessive allele from his father as well. Since males have one X and one Y chromosome, the trait would manifest if the recessive allele is on the X chromosome and there is no dominant allele present from the Y chromosome. If the mother is a carrier (heterozygous) or expresses the trait (homozygous recessive), the boy could inherit the recessive allele and exhibit the trait.
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.
Can a sex-linked allele be dominant?
Yes, a sex-linked allele can be dominant. For example, if a gene on the X chromosome is dominant, females who inherit the allele will express the trait, while males only need one copy of the dominant allele to show the trait since they have only one X chromosome.
What is genotype for a recessive trait found on the female chromosome?
The genotype for a recessive trait found on the female chromosome typically consists of two copies of the recessive allele (homozygous recessive, e.g., "aa") or one copy of the recessive allele and one copy of the dominant allele (heterozygous, e.g., "Aa"). In females (XX), if the trait is located on one of the X chromosomes, a female must have two copies of the recessive allele on both X chromosomes to express the recessive trait. If she has one dominant allele, she will be a carrier but not express the trait.
Which allele combination represents a female who has a heterozygous sex-linked trait?
A female with a heterozygous sex-linked trait typically has one dominant allele and one recessive allele for that trait. Since sex-linked traits are often associated with the X chromosome, the allele combination would be represented as XᴴXʰ, where Xᴴ is the X chromosome carrying the dominant allele and Xʰ is the X chromosome carrying the recessive allele. This combination indicates that the female expresses the dominant trait but is a carrier of the recessive trait.
If a human baby boy inherits a recessive allele from his mother in which circumstance would he most likely show the trait coded for by the recessive allele?
A human baby boy would most likely show the trait coded for by a recessive allele if he inherits the same recessive allele from his father as well. Since males have one X and one Y chromosome, the trait would manifest if the recessive allele is on the X chromosome and there is no dominant allele present from the Y chromosome. If the mother is a carrier (heterozygous) or expresses the trait (homozygous recessive), the boy could inherit the recessive allele and exhibit the trait.
Which trait will a male exhibit if he carries a recessive allele on the X chromosome?
A male carrying a recessive allele on the X chromosome will exhibit the recessive trait. This is because the Y chromosome generally does not have matching genes for the X chromosome, unlike the other 22 pairs if chromosomes in the nucleus.
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.
What is the difference between the dominant and recessive allele for a trait?
An individual must have 2 recessive alleles in order for a trait to show up. One must only have 1 dominant allele in order for a trait to occur.
Can a sex-linked allele be dominant?
Yes, a sex-linked allele can be dominant. For example, if a gene on the X chromosome is dominant, females who inherit the allele will express the trait, while males only need one copy of the dominant allele to show the trait since they have only one X chromosome.
What is genotype for a recessive trait found on the female chromosome?
The genotype for a recessive trait found on the female chromosome typically consists of two copies of the recessive allele (homozygous recessive, e.g., "aa") or one copy of the recessive allele and one copy of the dominant allele (heterozygous, e.g., "Aa"). In females (XX), if the trait is located on one of the X chromosomes, a female must have two copies of the recessive allele on both X chromosomes to express the recessive trait. If she has one dominant allele, she will be a carrier but not express the trait.
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.
Snice the allele for colorblindness is located on the x chromosome which type of trait is colorblindness?
Sex linked
Can a woman have a recessive sex linked trait?
Yes, a woman can express a recessive sex-linked trait if she inherits two copies of the recessive allele, one from each parent. Since women have two X chromosomes, they can be homozygous for the recessive trait. In contrast, men, who have one X and one Y chromosome, only need one copy of the recessive allele on their X chromosome to express the trait. Therefore, while women can be carriers of a recessive sex-linked trait with one recessive allele and one dominant allele, they will only show the trait if they inherit the recessive allele from both parents.
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.
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.
