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Which recessive allele most often remains on the same chromosome as A?
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Why are recessive alleles not removed from populations over time?
If the recessive genotype is selected for more often than the dominant genotype, the recessive allele will become more common than the dominant allele in the gene pool.
Why are sex linked recessive disorders such as hemophilia most often seen in males and rarely seen in females?
The recessive genes are present on the X-chromosome. Female chromosome has another X-chromosome, which is dominant and masks the defective gene, and it is quite rare that both the chromosomes have recessive alleles. But, in males, the Y-chromosome has nothing to over mask the defective gene and the abnormality shows up in the form of the disease.
Why hemophilia and color blindness occur much more often in men than in women?
It is due to two factors. One is that these traits are coded on the x-chromosome, of which women have two, men only one (since it is paired with a y-chromosome in men). The other factor is that the two traits are both recessive, that is they are suppressed in the presence of the dominant, healthy allele. In men there is no other x-chromosome, which could provide a healthy allele to counteract the effect of the mutant alleles, therefore these disorders occur more frequently. However, due to mosaicism, and x-chromosome inactivation (Barr-body formation), women who carry the color-blind x-chromosome have color-blind patches in their retinas, or may even be nearly completely color-blind in one eye.
Why is hemophilia rarely expressed in females?
Because hemophilia is a disease linked to a recessive gene on the X-chromosome, females have another X-chromosome to block out the diseased one. However, males have only one X-chromosome, so they are more often subject to hemophilia.
Why are males affected by recessive sex-linked traits more often than females?
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.
What allele is covered up by the dominant allele?
An allele that's masked by a dominant gene is called a "Recessive"recessiverecessive traitThe recessive allele. Often depicted as the "small r" in examples: Rr, R=dominant, r= recessive.
The weaker of two alleles in a pair that is often masked by the dominant allele?
The recessive allele.
Why are recessive alleles not removed from populations over time?
If the recessive genotype is selected for more often than the dominant genotype, the recessive allele will become more common than the dominant allele in the gene pool.
How are dominant and recessive traits represented?
Autosomal recessive alleles ( both males and females) and X-linked alleles in females always express themselves in homozygous condition. On other hand, X -chromosome linked recessive allele express singly in males.
Why are sex linked recessive disorders such as hemophilia most often seen in males and rarely seen in females?
The recessive genes are present on the X-chromosome. Female chromosome has another X-chromosome, which is dominant and masks the defective gene, and it is quite rare that both the chromosomes have recessive alleles. But, in males, the Y-chromosome has nothing to over mask the defective gene and the abnormality shows up in the form of the disease.
What is an example of allele?
an allele is an alternative form of a gene that governs a characteristic, like hair or eye color. an individual gets 1 allele for each charecteristic from each parent. There are dominant alleles and recessive alleles. The dominant allele is the allele that is the person's physical appearance, and the recessive allele is the one that isn't visible but the person has in his/her genotype.
Why do males and females express X-linked alleles differently?
X-linked recessive traits that are not related to feminine body characteristics are primarily expressed in the observable characteristics, or phenotype of men. This is due to the fact that men only have one X chromosome. Subsequently, genes on that chromosome not coding for gender are usually expressed in the male phenotype even if they are recessive since there are no corresponding genes on the Y chromosome in most cases. In women, a recessive allele on one X chromosome is often masked in their phenotype by a dominant normal allele on the other. This explains why women are frequently carriers of X-linked traits but more rarely have them expressed in their own phenotypes.
Why hemophilia and color blindness occur much more often in men than in women?
It is due to two factors. One is that these traits are coded on the x-chromosome, of which women have two, men only one (since it is paired with a y-chromosome in men). The other factor is that the two traits are both recessive, that is they are suppressed in the presence of the dominant, healthy allele. In men there is no other x-chromosome, which could provide a healthy allele to counteract the effect of the mutant alleles, therefore these disorders occur more frequently. However, due to mosaicism, and x-chromosome inactivation (Barr-body formation), women who carry the color-blind x-chromosome have color-blind patches in their retinas, or may even be nearly completely color-blind in one eye.
Why is hemophilia rarely expressed in females?
Because hemophilia is a disease linked to a recessive gene on the X-chromosome, females have another X-chromosome to block out the diseased one. However, males have only one X-chromosome, so they are more often subject to hemophilia.
Why are males affected by recessive sex-linked traits more often than females?
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.
Why do men have more sex-linked disorders than women?
If you are a carrier of a sex-linked genetic disorder, you will carry that disorder based on your sex hormones, because they influence the appearance of the trait. A person who carries the trait will have the disease but may not show it. ---- Sex-linked disorders are genetic disorders linked directly to a human's chromosomes. In the case of chromosomes, females (XX) give an X chromosome to their offspring. Males (XY) can give either an X or a Y chromosome to their offspring. Because only males can have a Y chromosome, sex-linked disorders usually occur in males.
Why do Males tend to be affected in greater numbers by X-linked recessive genetic disorders than females?
males have only one X chromosomes
