What is an example of penetrance?

What is an example of penetrance?

Penetrance refers to the probability of a gene or trait being expressed. In some cases, despite the presence of a dominant allele, a phenotype may not be present. One example of this is polydactyly in humans (extra fingers and/or toes).

What phenotype is purebred?

Purebred – Also called HOMOZYGOUS and consists of gene pairs with genes that are the SAME. Hybrid – Also called HETEROZYGOUS and consists of gene pairs that are DIFFERENT. Genotype is the actual GENE makeup represented by LETTERS. Phenotype is the PHYSICAL appearance of a trait, such as a YELLOW (or BLUE) body color.

What gene is responsible for fur color?

The type and amount of melanin in hair is determined by many genes, although little is known about most of them. The best-studied hair-color gene in humans is called MC1R. This gene provides instructions for making a protein called the melanocortin 1 receptor, which is involved in the pathway that produces melanin.

What is an example of incomplete penetrance?

A specific example of incomplete penetrance is the human bone disease osteogenesis imperfecta (OI). The majority of people with this disease have a dominant mutation in one of the two genes that produce type 1 collagen, COL1A1 or COL1A2. Collagen is a tissue that strengthens bones and muscles and multiple body tissues.

What causes variable penetrance?

As with reduced penetrance, variable expressivity is probably caused by a combination of genetic, environmental, and lifestyle factors, most of which have not been identified. If a genetic condition has highly variable signs and symptoms, it may be challenging to diagnose.

Is multiple alleles also occurs in the fur color of rabbits and laboratory mice?

One of the best-known examples of multiple allele inheritance is coat color in rabbits. A single gene that has at least four different alleles determines a rabbit’s coat color. The four known alleles display a pattern of simple dominance that can produce four coat colors.

Which is an example of incomplete dominance?

Children born with semi-curly or wavy hair are an example of individuals exhibiting incomplete dominance because the crossing of parents alleles both straight and curly hairs to produce such offspring. Thus, incomplete dominance occurs to produce an intermediate trait between the two parent traits.

What is purebred animal?

Purebred are those animals that have been bred-up to purebred status as a result of using full blood animals to cross with an animal of another breed. The breeders association rules the percentage of fullblood genetics required for an animal to be considered purebred, usually above 87.5%.

Is fur color a phenotype or genotype?

Phenotype is the term for all the observable characteristics for which the genes code. In other words, the genotype refers to the genetic information, while the phenotype refers to the observable characteristics, including traits. In humans, phenotype examples are eye color and hair color.

Is fur color an allele?

Mendel implied that only two alleles, one dominant and one recessive, could exist for a given gene. An example of multiple alleles is coat color in rabbits (Figure 1). Here, four alleles exist for the c gene. The wild-type version, C +C+, is expressed as brown fur.