Concept explainers
A.
To determine: Why calico cats are almost female.
Concept introduction: Some of the cats are white with patches of two colors (usually black and orange). Such cats are called as calico cats. The coat colors in them are determined and are associated with the X chromosomes. Most of the calico cats are females. One of their color coats is determined by the maternal X chromosome and the other with the paternal X chromosome. Males are rare as they have only one sex chromosome and mostly the males are often sterile.
B.
To determine: Why the calico cats are rare and sterile.
Concept introduction: Some of the cats are white with patches of two colors (usually black and orange). Such cats are called as calico cats. The coat colors in them are determined and are associated with the X chromosomes. Most of the calico cats are females. One of their color coats is determined by the maternal X chromosome and the other with the paternal X chromosome. Males are rare as they have only one sex chromosome and mostly the males are often sterile.
C.
To propose: A mechanism that would give rise to the white fur.
Concept introduction: Some of the cats are white with patches of two colors (usually black and orange). Such cats are called as calico cats. The coat colors in them are determined and are associated with the X chromosomes. Most of the calico cats are females. One of their color coats is determined by the maternal X chromosome and the other with the paternal X chromosome. Males are rare as they have only one sex chromosome and mostly the males are often sterile.
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