Is a Selkirk Rex Homozygous or Heterozygous? Unveiling the Genetic Traits

The journey of the Selkirk Rex began in 1987 when a curly-coated kitten named Miss DePesto was born in Montana, USA. Miss DePesto’s unique appearance caught the attention of breeder Jeri Newman, who recognized the potential for a new breed. She bred Miss DePesto with a Persian cat, resulting in a litter of kittens with curly coats. Thus, the Selkirk Rex breed was born.

Physical Characteristics of Selkirk Rex

One of the most striking features of the Selkirk Rex is its curly coat. Unlike other curly-haired cat breeds, such as the Cornish Rex or Devon Rex, the Selkirk Rex’s curls are thicker and more voluminous. These curls can range from loose waves to tight ringlets, giving each cat a unique and eye-catching appearance.

Apart from their curly coats, Selkirk Rex cats have a sturdy and muscular build. They have round faces, prominent cheeks, and large eyes that exude a sweet and affectionate expression. Their body structure is well-balanced and their limbs are of medium length.

Behavioral Traits of Selkirk Rex

Selkirk Rex cats are known for their friendly and laid-back nature. They are generally sociable and get along well with other pets and family members, including children. These cats have a gentle and patient disposition, making them a popular choice for families and individuals seeking a loving and calm companion.

Exploring Genetic Terms

Before diving into the specific genetic traits of the Selkirk Rex, let’s clarify some essential genetic terms that will help us understand the topic better.

Genotype vs. Phenotype

When discussing genetics, two key terms often come up: genotype and phenotype. The genotype refers to the genetic makeup of an organism, while the phenotype refers to its observable characteristics. In the case of the Selkirk Rex, the genotype determines the specific genes responsible for their curly coats, coat colors, and eye color variations.

Homozygous vs. Heterozygous

Homozygous and heterozygous are terms used to describe the presence of identical or different alleles, respectively, of a specific gene. In simple terms, homozygous means that an individual has two copies of the same gene, while heterozygous means that they have two different copies.

Genetic Traits of Selkirk Rex

Now that we have a basic understanding of the genetic terms, let’s explore the specific genetic traits that make the Selkirk Rex breed so unique.

Coat Texture and Curling Gene

The most distinctive genetic trait of the Selkirk Rex is, of course, its curly coat. This curly coat is the result of a specific gene known as the “curling gene.” Selkirk Rex cats can inherit this gene from either one or both of their parents, which affects the texture and curliness of their coats.

The curling gene is a dominant gene, meaning that even if a cat inherits just one copy, it will have a curly coat. However, the degree of curliness can vary depending on whether the cat is homozygous or heterozygous for the gene.

Coat Colors and Patterns

Selkirk Rex cats come in a wide range of coat colors and patterns. From solid colors like black, white, and red, to various tabby patterns, tortoiseshell, and bicolor coats, there is a Selkirk Rex to suit every aesthetic preference.

These coat colors and patterns are determined by multiple genes, and the inheritance can be more complex compared to the curling gene. However, it is not directly linked to whether a Selkirk Rex is homozygous or heterozygous.

Eye Color Variations

Selkirk Rex cats can display a beautiful array of eye colors, including blue, green, gold, and copper. Eye color is also influenced by genetics, but like coat colors and patterns, it is not directly linked to the homozygous or heterozygous status of the cat.

Determining the Homozygous or Heterozygous Status

Determining whether a Selkirk Rex is homozygous or heterozygous for the curling gene requires genetic testing. This testing can provide valuable insights into the specific alleles present in an individual cat.

Genetic Testing for Selkirk Rex

Genetic testing involves analyzing the DNA of a cat to identify specific genes and their variations. By testing for the presence of the curling gene, breeders and owners can determine whether a Selkirk Rex is homozygous or heterozygous for the gene, shedding light on the potential curliness of future offspring.

Factors Influencing Homozygosity or Heterozygosity

The homozygous or heterozygous status of a Selkirk Rex can be influenced by various factors. Breeding practices and the selection of parent cats play a significant role in determining the genetic makeup of the offspring. Breeders who aim to maintain or enhance specific traits, such as coat curliness, may choose to selectively breed homozygous cats to increase the likelihood of passing on desired traits to future generations.

Implications of Homozygosity or Heterozygosity

Understanding whether a Selkirk Rex is homozygous or heterozygous can have implications for their health and future breeding strategies.

Health Considerations

Homozygosity can sometimes lead to an increased risk of certain genetic disorders. Therefore, breeders and owners need to be aware of any potential health concerns associated with specific genetic traits and take appropriate measures to ensure the well-being of their cats.

Breeding Strategies

Knowing the homozygous or heterozygous status of a Selkirk Rex can help guide breeding strategies. Breeders may choose to pair homozygous cats to maintain specific traits consistently or introduce heterozygous cats to diversify the gene pool and reduce the risk of health issues associated with homozygosity.


The Selkirk Rex is undoubtedly a captivating breed with its curly coat and lovable personality. Understanding the genetic traits behind their unique appearance can enhance our appreciation for these wonderful cats. While determining whether a Selkirk Rex is homozygous or heterozygous requires genetic testing, the knowledge gained from such tests can inform breeding strategies and ensure the health and well-being of these beloved feline companions. So, the next time you come across a Selkirk Rex, you’ll have a deeper understanding of the genetic wonders that make them truly special.

ThePetFaq Team