Which term describes the expression of a trait?
A trait is a specific characteristic of an organism. The genetic contribution to a trait is called the genotype. The outward expression of the genotype is called the phenotype.
What kind of trait is phenotype?
A phenotype is an individual’s observable traits, such as height, eye color, and blood type. The genetic contribution to the phenotype is called the genotype. Some traits are largely determined by the genotype, while other traits are largely determined by environmental factors.
What is genotype phenotype?
A genotype refers to the genetic characteristics of an organism. A phenotype refers to the physical characteristics. For example, having blue eyes (an autosomal recessive trait) is a phenotype; lacking the gene for brown eyes is a genotype.
How does a genotype become a phenotype?
Genotype & Phenotype. Definitions: phenotype is the constellation of observable traits; genotype is the genetic endowment of the individual. Phenotype = genotype + development (in a given environment). In a narrow “genetic” sense, the genotype defines the phenotype.
What is a homozygous simple definition?
Homozygous Homozygous is a genetic condition where an individual inherits the same alleles for a particular gene from both parents.
Is eye color a Mendelian trait?
In the most elementary form, the inheritance of eye color is classified as a Mendelian trait. On the basis of the observation of more than two phenotypes, eye color has a more complex pattern of inheritance. Eye color ranges include varying shades of brown, hazel, green, blue, gray, and in rare cases, violet and red.
What type of trait is eye color?
polygenic
Is purple a eye color?
Violet Eyes This color is most often found in people with albinism. It is said that you cannot truly have violet eyes without albinism. Mix a lack of pigment with the red from light reflecting off of blood vessels in the eyes, and you get this beautiful violet!
Can albinos have purple eyes?
Although some individuals with albinism have reddish or violet eyes, most have blue eyes. Some have hazel or brown eyes. However, all forms of albinism are associated with vision problems.
Do albinos have blue eyes?
People with ocular albinism usually have blue eyes. In some cases, the iris (the colored part of the eye) has very little color so a person’s eyes might look pink or reddish.
Why do albinos have blue eyes?
Albinism keeps the body from making enough of a chemical called melanin, which gives eyes, skin, and hair their color. Most people with ocular albinism have blue eyes. But the blood vessels inside can show through the colored part (the iris), and the eyes can look pink or red.
What race is albinism most common in?
sub-Saharan African
Who is most likely to albinism?
The condition affects people in many ethnic groups and geographical regions. Types 1 and 2 are the most common forms of this condition; types 3 and 4 are less common. Type 2 occurs more frequently in African Americans, some Native American groups, and people from sub-Saharan Africa.
Can albinism be detected before birth?
KIE: Albinism, a recessive genetic condition, can be diagnosed by fetoscopy between the 16th and 20th weeks of pregnancy, in time for subsequent abortion. Taylor, president of The Albino Fellowship, considers whether the disabilities of albinism justify abortion of an albino fetus.