In cats, there is a coat color gene located on the X chromosome which has two alleles—an allele for orange fur and an allele for black. A heterozygous cat has tortoiseshell color (a splotchy mixture of orange and black). Predict the genotypic and phenotypic frequencies among the offspring of the following crosses. Pay careful attention to the genders of the offspring. Black female X Orange male Orange female X Black male Tortoiseshell female X Black male
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.
- In cats, there is a coat color gene located on the X chromosome which has two alleles—an allele for orange fur and an allele for black. A heterozygous cat has tortoiseshell color (a splotchy mixture of orange and black). Predict the genotypic and
phenotypic frequencies among the offspring of the following crosses. Pay careful attention to the genders of the offspring.
- Black female X Orange male
- Orange female X Black male
- Tortoiseshell female X Black male
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