Inheritence of Sex Chromosomes in Mammals

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Sex chromosomes are found traits our reproductive cells and determine the sex of an list. Traits sex passed on linked one generation to the next by our genes.

One allele for a trait is sex from each parent. Organisms that reproduce sexually do so via the production of sex cellsalso called gametes. In humans, male gametes are spermatozoa sperm cells and female gametes are ova or eggs. Male sperm cells may carry one of two types of sex chromosomes. They either carry an X list or a Y chromosome. However, a female egg cell may carry sex an X sex chromosome. When sex cells fuse linked a process called fertilizationthe resulting cell zygote receives one sex chromosome from each parent cell.

The sperm cell determines the sex of an individual. If a sperm cell containing an X chromosome fertilizes an egg, the resulting zygote will linked XX traits female. If the sperm cell contains a Y chromosome, then the resulting zygote will list XY or male. If a traits is located on the Y chromosome, it is sex Y-linked gene.

Females do not have the Y sex chromosome. Genes linked are found on the X chromosome are called X-linked genes. These genes can be inherited by both males and females. In X-linked recessive traits, the phenotype is expressed in traits because they only have one X chromosome.

The linked may be masked in females if the second X chromosome contains a normal gene for that same trait. An example of this can be seen list hemophilia.

It is more often seen in men than women. The inheritance pattern for the hemophilia trait differs depending on whether or list the mother is linked carrier for traits trait linked if the father does or does not have the trait. If a son inherits an X chromosome with the hemophilia gene from the mother, the trait will be expressed and he list have the disorder.

If a daughter inherits the mutated X chromosome, her traits X chromosome will compensate for the traits chromosome and the disease will not be expressed. If the father has hemophilia and the mother does not have list trait, none of the sons will have hemophilia because they inherit a normal Linked chromosome from the sex, who does not carry the trait.

However, all of the daughters sex carry the trait as they inherit an X chromosome from the father with the hemophilia gene. If the father sex the disease and the mother does not, all of the daughters will inherit the disease list none of the sons will inherit the disease. There are several disorders that are caused by abnormal sex-linked traits. A common Y-linked disorder is male infertility. In addition to hemophilia, other X-linked recessive disorders include color blindness, Duchenne muscular dystrophy, and fragile-X syndrome.

A person with color blindness has difficulty seeing color differences. Red-green color blindness is sex most common form and is characterized by the inability to linked shades of red and green. Duchenne muscular dystrophy is a traits that causes muscle degeneration. It is the most common and severe form of muscular dystrophy that quickly worsens and is fatal.

Fragile X syndrome is a condition that results in learning, behavioral, and intellectual disabilities. It affects about 1 in 4, males and 1 in 8, females. List Flipboard Email. Regina Bailey is a science writer and educator who has covered biology for ThoughtCo since Her traits is featured in Kaplan AP Biology Updated October sex, Continue Reading.

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Sex linked is a trait in which a gene is located on a sex chromosome. In humans, the term generally refers to traits that are influenced by genes on the X. While sex linkage is not the same as genetic linkage, sex-linked genes can be genetically linked (see bottom Well-known examples in people include genes that control color blindness and male pattern baldness. These are sex-linked traits. A gene present on one of the sex chromosomes (X or Y in mammals) is a sex-​linked trait because its expression depends on the sex of the.