Biology : asked on TheJanko4526
 08.07.2021

Which combination of alleles are always involved in the inheritance of a sex-linked trait?
heterozygous alleles
homozygous alleles
alleles that are carried on X and Y chromosomes
alleles that are carried on all chromosomes except the X and Y chromosomes

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20.11.2022, solved by verified expert
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Which combination of alleles are always involved, №14322750, 08.07.2021 18:22

Alleles that's are carried on X and Y chromosomes.

Explaination: it is involved in the inheritance of a sex-linked trait.

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The combination of alleles always involved in the inheritance of a sex-linked trait are:

"alleles that are carried on X and Y chromosomes"

Sex-linked traits are associated with genes located on the sex chromosomes (which are the X and Y chromosomes in humans). Women have two X chromosomes (XX) and men have one X and one Y chromosome (XY). As each parent contributes one sex chromosome to offspring, sex-linked traits are often studied in terms of their inheritance from one generation to the next.

There are significantly more genes found on the X chromosome than on the Y chromosome. Because of this, many sex-linked traits are X-linked, meaning that they are associated with an allele on the X chromosome.

For instance, colorblindness and hemophilia are both X-linked traits. Since males only have one X chromosome, if they inherit the allele for such a trait from their mother (along with the Y chromosome from their father), they will express the trait, because there is not a "healthy" allele on a second X chromosome to mask the "unhealthy" one--as there would be for a female. Conversely, females has two X chromosomes, if they inherit only one allele for a trait, they may be carrier but not express the trait, because it's likely that the allele on the other X chromosome is healthy.

Hence, combinations of alleles on the X and Y chromosomes have a huge role in the inheritance of sex-linked traits.
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