Question

Calico cats are nearly all females because the alleles for the different colors that appear are carried on the X chromosomes. Males are rarely multicolored, because they can only carry one form of the allele. What is this an example of?

Answer 1

This is example of Inactivation of X chromosome.

Step-by-step explanation:

In calico cats, Fur color is carried on Chromosome X. Female cats have two X chromosomes. When they have two X chromosomes, some of these X chromosomes in some cells throughout the body are INACTIVATED and they are seen as black dots under microscope. These black dots are called Barr Bodies. Normally calico cats have brown and white fur color, and also black color due to this barr bodies. X in activation or the formation of barr bodies are not observed in males because they have only one X chromosome.