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What are the hallmarks of autosomal recessive traits?

Question:

What are the hallmarks of autosomal recessive traits?

Chromosomes:

A human has 23 pairs of chromosomes. One pair of chromosomes are the sex chromosomes which are XX for women and XY for men. The other 22 pairs of chromosomes are autosomes.

Answer and Explanation:

The hallmarks of autosomal recessive traits are that they affect men and women equally and they can skip generations in a person's genetic pedigree chart. The reason they affect men and women equally is that all humans have 22 pairs of autosomal chromosomes so there will always be two alleles to influence a trait rather than sex-linked traits that are more common in men than in women. As recessive traits require two copies of a particular gene to manifest, the trait can skip generations where a parent is a carrier of one copy of the gene but lacks the corresponding gene for the trait to manifest.


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Pedigree Analysis in Human Genetics: Inheritance Patterns

from Biology 102: Basic Genetics

Chapter 6 / Lesson 3
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