What is a sex influenced trait? What is the difference between sex linked trait. Is baldness sex influenced?

Question

Any help appreciated. Thanks!

Answer 1

A sex influenced trait is a trait that is chosen on the basis of sexual reproduction. An example of this is the feathers in peacocks. The bigger and more colorful the feathers the more reproductive success of that peacock thus this trait is sexually influenced.

A sex linked trait is a trait passed through to offspring on a sex chromosome (X or Y) Baldness is considered a sex linked trait because the genes for hair growth is on the X chromosome. So if a mother was a carrier for baldness and donates that chromosome (X) to a male offspring, that offspring will be bald due to the boy having the baldness gene.

Answer 2

Each are distinctly different forms of inheritance:

Sex Linked- the inheritance of certain traits are governed by the sex of the individual, meaning that the gene would be found on the Sex Chromosome (the X or Y chromosome)

Sex influenced- a trait is more likely to be seen in one sex over the other, but these traits are predominantly autosomal. For example, pattern baldness is sex influenced because it is more likely to be seen in men because it has a linkage to the production of testosterone. This is sex influenced because women can have pattern baldness too. Another example is osteoporosis: this is more common in women because men have testosterone, which is bone-strengthening. But, that doesn't mean that men can't have osteoporosis (because they can). It's just more likely that one trait is seen in one sex rather than the other.

Sex limited: this is found in one gender or the other. This is not sex linked or sex influenced. This is a type of inheritance pattern where only men or only women could have a certain trait. For example, only women can have ovarian cancer or only men can have prostate cancer.

Answer 3

Some traits are carried on the sex chromosomes, X and Y. Most traits carried are present on only the X-chromosome. The Y-chromosome is smaller, and so, very few genes are located on this chromosome.

Sex traits can be categorized into three types of inheritance: sex-limited, sex-linked, and sex-influenced.

Sex-limited traits are traits that are visible only within one sex. For instance, barred coloring in chickens normally is visible only in the roosters.

Sex-linked trait is relating to a gene located on a sex chromosome or a characteristic or trait inherited along with one's sex through being determined by such a gene. The best known examples in humans are haemophilia and various forms of colour-blindness, which are determined by genes located on the X chromosome, carried by females but expressed mostly by males, because the smaller Y chromosome has no homologous alleles to bring about complementation.

Sex-influenced traits are autosomal traits that are influenced by sex. If a male has one recessive allele, he will show that trait, but it will take two recessive for the female to show that same trait. One such gene is baldness.
Example: Early balding (pattern baldness) in humans. Heterozygous men (b+/b) lose their hair; heteroyzgous women do not have significant hair loss.
Homozygous men or women (b/b) become bald. The trait is therefore dominant in men, recessive in women.

Answer 4

A sex-linked trait is any trait whose gene resides on either the X or the Y chromosome.

A sex-influenced trait is one which is expressed in different ways in the two sexes. The genes for sex influnced traits may or may not reside on a sex chromosome.

So, colorblindness is a sex-linked trait in humans because its gene lies on the X-chromosome.

Antler size in deer or milk production in cattle are sex influenced traits. Female deer have genes for antler size, but don't express them. Bulls have genes for milk production, but never produce milk.

Baldness in humans appears to be a dominant trait in males, but a recessive trait in females, and so is a sex influeced trait.

Answer 5

Baldness is a sex linked trait that can only be carried by women, but show up in men. The sex link means that only one sex can carry the trait, in the case of baldness, women.

Answer 6

a sex-linked trait is a trait that is carried on the X chromosome which it appears in men easily as they have only one X chromosome but in women both Xs have to have the dominant gene on them

while sex influenced traits like baldness appears weakly in women as hair falling only but appears as baldness in men

Answer 7

Sex-limited traits are those that are expressed exclusively in one sex of the species. In cattle for instance, lactation is expressed in females but never in males.

Sex-influenced traits are expressed in both sexes but more frequently in one sex than in the other sex. For example, baldness may be expressed in females but it occurs more frequently in males.