In January 2019, the Indy Star (Indianapolis, IN) published a story about a male calico cat named David Bowie that was adopted from a local shelter. It is estimated that about 1 in 3000 calico cats is a male. When looking under the microscope at nuclei from cells taken from David Bowie, veterinarians noticed that each nucleus contains a Barr body. What is David Bowie's likely karyotype with respect to his sex chromosomes? O XY O XX Ο ΧΥΜ O XXY O XXX
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.


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