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What describes allele that causes color blindness?
It is carried on the X chromosomeIt is carried on the X chromosome
What allele combination would will have a colorblind child?
carried on the x chromosome
Is a chromosome a allele?
No, a chromosome is a structure that contains genetic information, while an allele is a specific variant of a gene located on a chromosome. Chromosomes contain many alleles that determine an individual's traits and characteristics.
What is the condition that is carried on the x chromosome whereby an affected mother passes the condition to all sons?
for son x chromosome comes from mother and y chromosome from father. If the mother had both allele got affected then the transfer of disease is 100 %. If only one allele is affected then 50% possibility of son getting affected
What an allele?
An allele is an alternative form of a gene that is found at the same location on a chromosome.
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.
What is dominant the X or the Y?
An allele on either X or Y could be dominant over the allele on the other chromosome, but it is more common for the allele on the X to be dominant, because the Y chromosome is much smaller than the X and contains fewer genes. In many cases, there is no allele for a particular gene on the Y chromosome; so whatever allele is on the Y will be dominant.
Most copies of harmful recessive alleles are carried by?
Most copies of harmful recessive alleles are carried by unaffected carriers who are phenotypically normal but carry one copy of the allele. When two carriers have offspring, there is a 25% chance the child will inherit two copies of the harmful allele, leading to a genetic disorder.
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.
Is the Prader Willi Syndrome carried by males or females?
it is carried by both males and females but technically the cause of it is when chromosome 15 from the father is not passed on. so they child only gets the chromosome from the mother. so is it from the mother or father? it cant be both can it? the father's chromosome dissapears, so the mothers replaces it. it is so confusing. Remember that each parent contributes 1 allele, or copy of a chromosome. So in Prader Willi, the mother's allele is imprinted, or silenced and so you're depending on the father's allele for expression. But unfortunately, in PW you get deletion of the father's allele, which is why disease occurs. So yes- can occur in both males and females bc we're not talking about sex chromosomes here.
Why does selection act faster against a harmful dominant allele than a harmful recessive allele?
Selection acts faster against a harmful dominant allele because individuals with the allele will show the harmful trait, making them more likely to be removed from the population. In contrast, harmful recessive alleles are only expressed in homozygous individuals, making it harder for selection to act on them as carriers of the allele may not exhibit the harmful trait.
What is it an example of when calico cats are mostly females because the allele for different covers is carried on the X chromosome so males are never multi colored?
sex-linked inheritance
