Sex-linked traits - some traits are carried on the sex chromosomes, X and Y. Most traits carried are present on only the X-chromosome. The Y-chromosome is smaller, and so, very few genes are located on this chromosome.
Colorblindness is a sex-linked, recessive trait.
1. What is the phenotype for the following genotypes – make sure that you specify male or
female:
XBXB _________________________ XBY _________________________ XBXb _________________________ XbY _________________________
XbXb _________________________
The phenotypes for the following genotypes are:
XBXB: Female carrier of colorblindness
XBY: Male with normal color vision
XBXb: Female carrier of colorblindness
XbY: Male with colorblindness
XbXb: Female with colorblindness