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Inherited Disorders and Birth Defects

Sex influenced trait

10/15/2000

Question:

What are the sex influenced traits?

Answer:

Sex-influenced traits are traits that are expressed more frequently in one sex and are rare in the other. For example, pattern baldness is an autosomal dominant trait seen most commonly in males and requires only one gene to be expressed. For females to have expression of the trait, they would need to have two copies of the gene.

Sex-limited traits are those traits that are only expressed in one sex, but not the other. These are genes that are located on the autosomes (not the sex chromosomes - the X or the Y chromosome). For example, only females menstruate, however, males can carry the gene - they just would not be able to express it.

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Response by:

Anne   Matthews, RN, PhD Anne Matthews, RN, PhD
Associate Professor of Genetics
School of Medicine
Case Western Reserve University