The detectable traits of an organism as determined by what alleles are present is the what? The two copies, called alleles, can be slightly different from each other. a third new phenotype appears in the heterozygous condition as a blend of the dominant and recessive phenotypes codominance in the heterozygous condition, both alleles are expressed equally with no blending; represented by using two different capital letters Combinations of different alleles thus go on to generate different traits through the information flow charted above. These traits are called dominant traits. A test cross is a way to explore the genotpye of an organism.

If this is for an answer in Horse Isle 2, the answer is dominant Not expressed when the dominant form of the trait is present? Early use of the test cross was as an experimental mating test used to determine what alleles are present in the genotype. A and B alleles are codominant, whereas the O allele is recessive.

What is a trait called that appears only when both alleles are present?

A trait that is controlled by more than one gene is called polygenic which translates to "multiple genes". A dominant allele is an allele that is almost always expressed, even if only one copy is present. Dominant vs. Recessive Alleles.
An organism’s underlying genetic makeup, consisting of both physically visible and non-expressed alleles, is called its genotype. An allele that appears or expresses itself over a recessive trait is called a dominant allele. The genes work together to make one trait.Examples are skin, eye and hair color. A gene is only a DNA code sequence; the slightly different variations of that sequence are called alleles.


When the alleles present for a trait are the same, it is called Homozygous What is a trait called that appears only when both alleles are present? The trait that first appears or is visibly expressed in the organism is called the dominant trait. When you are homozygous for a recessive allele, the phenotype expressed is the recessive trait. Two alleles for a given gene in a diploid organism are expressed and interact to produce physical characteristics. the particular alleles at specified loci present in an organism. The trait that is present at the gene level but is masked and does not show itself in the organism is called the recessive trait. They will overcome the recessive gene and the dominant trait will be expressed. Type AB blood is an example.

Dominant alleles are responsible for dominant traits and if two dominant alleles are found together, a dominant trait will be expressed. The observable traits expressed by an organism are referred to as its phenotype.

recessive trait that will only appear in the phenotype if organism inherits two alleles (so is homozygous); The combinations work out as follows: AA and AO give type A blood, BB and BO gives type B blood, AB gives AB blood and OO gives O type blood. consists of one dominant and one recessive allele.

A trait controlled by two or more genes, and each genes often have two alleles. An individual with one dominant and one recessive allele for a gene will have the dominant phenotype.They are generally considered “carriers” of the recessive allele: the recessive allele is there, but the recessive phenotype is not.


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