The Y chromosome is much smaller than the X chromosome. X X X XX XX Y XY XY a karyotype is used to show the difference between autosomes and sex chromosomes X. Pedigrees. Patterns of Inheritance. B. Autosomal Dominant Inheritance the trait is expressed in heterozygous carriers. Tips for Doing Genetics Problems.
Freckles are an autosomal recessive trait.
XA XAXa XAY Xa XaXa XaY 3. If this has confused you please make the corrections Thanks to the students who brought this to my attention. Tortora and Grabowski , Principles of Anatomy and Physiology, 8th Edition , Harper Collins Publishing, 1997.