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koban [17]
3 years ago
13

Which is true of sex-linked genes?

Biology
2 answers:
Elodia [21]3 years ago
7 0

Answer:

They always represent recessively inherited disorders.

Explanation:

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Chromosomes & mtDNA

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Help Me Understand Genetics

What are the different ways in which a genetic condition can be inherited?

Some genetic conditions are caused by mutations in a single gene. These conditions are usually inherited in one of several patterns, depending on the gene involved:

Patterns of inheritance

Inheritance pattern Description Examples

Autosomal dominant One mutated copy of the gene in each cell is sufficient for a person to be affected by an autosomal dominant disorder. In some cases, an affected person inherits the condition from an affected parent. In others, the condition may result from a new mutation in the gene and occur in people with no history of the disorder in their family. Huntington disease, Marfan syndrome

Autosomal recessive In autosomal recessive inheritance, both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition. Autosomal recessive disorders are typically not seen in every generation of an affected family. cystic fibrosis, sickle cell disease

X-linked dominant X-linked dominant disorders are caused by mutations in genes on the X chromosome, one of the two sex chromosomes in each cell. In females (who have two X chromosomes), a mutation in one of the two copies of the gene in each cell is sufficient to cause the disorder. In males (who have only one X chromosome), a mutation in the only copy of the gene in each cell causes the disorder. In most cases, males experience more severe symptoms of the disorder than females.

A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons (no male-to-male transmission)

========

givi [52]3 years ago
4 0

The true statement is that they may be on one sex chromosome and not the other.

<u>Explanation: </u>

  • The first statement says that, they are important only in sex determination. But it is not so, as they carry other genes which are not involved in sex determination.
  • They always don’t produce that are co-dominant. It is because when X genes are inherited it exerts certain traits whereas when Y genes are inherited it exerts certain traits which are separate and different in nature.
  • They represent the sex of the individual as well as the disorders associated with it.
  • Thus the statement which states that sex linked genes are inherited on either X-chromosome or on Y-chromosome is inferred as correct statement.

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