Asked by Jessica Cabrera on May 17, 2024
Verified
All calico cats are female because
A) two recessive X-linked genes are required for the calico phenotype.
B) Y-linked genes prevent the expression of the calico phenotype.
C) the calico phenotype is caused by random X chromosome inactivation.
D) the calico phenotype is a Y-linked trait.
E) one X chromosome and one Y chromosome are needed for the expression of the calico phenotype.
Calico Cats
Cats characterized by a tri-color fur pattern, typically involving patches of orange, black, and white, this pattern is most commonly found in female cats due to genetic linkage to the X chromosome.
X Chromosome Inactivation
A process in female mammals where one of the two X chromosomes is inactivated to ensure dosage compensation for gender-based genetic differences.
Phenotype
The set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.
- Explain the genetic basis of certain coat colors and patterns in animals through examples like calico cats.
Verified Answer
AC
Andrea CaballeroMay 21, 2024
Final Answer :
C
Explanation :
The calico phenotype in cats is due to the random inactivation of one of the two X chromosomes in females, leading to the expression of different color genes on the active X chromosomes in different cells. This phenomenon does not occur in males, as they have only one X chromosome.
Learning Objectives
- Explain the genetic basis of certain coat colors and patterns in animals through examples like calico cats.