Whatis a sex linked trait. Sex Linked Traits.



Whatis a sex linked trait

Whatis a sex linked trait

In humans, one pair of chromosomes the 23rd pair determines the gender of the individual. These 2 chromosomes are known as the sex chromosomes. The X chromosome is larger and carries more genes than the Y chromosome See diagram above. If two X chromosomes XX are present in the embryo, it generally develops into a female.

If one X and Y XY are present in the embryo, it generally develops into a male. Males determine the sex of the offspring as they can create either an X sperm or a Y sperm.

If a Y sperm fertilizes an egg, the embryo becomes a male. If an X sperm fertilizes an egg, the embryo becomes a female. Females can only create X eggs. Because the gene controlling the trait is located on the sex chromosome, sex linkage is linked to the gender of the individual.

Usually such genes are found on the X chromosome. The Y chromosome is thus missing such genes See Diagram above. The result is that females will have two copies of the sex-linked gene while males will only have one copy of this gene. If the gene is recessive, then males only need one such recessive gene to have a sex-linked trait rather than the customary two recessive genes for traits that are not sex-linked.

This is why males exhibit some traits more frequently than females. Examples of Sex-linked Traits: Red-green colorblindness — Inability differentiate between read and green.

Male Pattern Baldness Hemophilia — Causes the blood not to clot. If get a cut it may take a along time to clot or internal bleeding may result from a bruise.

Duchenne Muscular Dystrophy — Muscular weakness, progressive deterioration of muscle tissue, and loss of coordination. Red-Green Colorblindness In humans, red-green colorblindness is a recessive sex-linked trait c.

It is found on the X chromosome, not the Y. Because, males only have one X chromosome, they have a much greater chance of having red-green colorblindness. Females would have to be homozygous recessive in order to have red-green colorblindness.

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Sex Chromosomes and Sex-Linked Traits



Whatis a sex linked trait

In humans, one pair of chromosomes the 23rd pair determines the gender of the individual. These 2 chromosomes are known as the sex chromosomes. The X chromosome is larger and carries more genes than the Y chromosome See diagram above. If two X chromosomes XX are present in the embryo, it generally develops into a female. If one X and Y XY are present in the embryo, it generally develops into a male.

Males determine the sex of the offspring as they can create either an X sperm or a Y sperm. If a Y sperm fertilizes an egg, the embryo becomes a male. If an X sperm fertilizes an egg, the embryo becomes a female. Females can only create X eggs. Because the gene controlling the trait is located on the sex chromosome, sex linkage is linked to the gender of the individual. Usually such genes are found on the X chromosome. The Y chromosome is thus missing such genes See Diagram above.

The result is that females will have two copies of the sex-linked gene while males will only have one copy of this gene. If the gene is recessive, then males only need one such recessive gene to have a sex-linked trait rather than the customary two recessive genes for traits that are not sex-linked.

This is why males exhibit some traits more frequently than females. Examples of Sex-linked Traits: Red-green colorblindness — Inability differentiate between read and green. Male Pattern Baldness Hemophilia — Causes the blood not to clot. If get a cut it may take a along time to clot or internal bleeding may result from a bruise.

Duchenne Muscular Dystrophy — Muscular weakness, progressive deterioration of muscle tissue, and loss of coordination. Red-Green Colorblindness In humans, red-green colorblindness is a recessive sex-linked trait c. It is found on the X chromosome, not the Y. Because, males only have one X chromosome, they have a much greater chance of having red-green colorblindness.

Females would have to be homozygous recessive in order to have red-green colorblindness.

Whatis a sex linked trait

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1 Comments

  1. While sex linkage is not the same as genetic linkage , sex-linked genes can be genetically linked see bottom of page. In mammals , the female is homogametic, with two X chromosomes XX , while the male is the heterogametic sex , with one X and one Y chromosome XY. To learn more, visit Sex Determination.

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