If the paired alleles are the same, the organism’s genotype is said to be homozygous for that trait; if they are different, the organism’s genotype is heterozygous.
What are two paired alleles?
Paired alleles (one on each of two paired chromosomes) that are the same are called homozygous , and those that are different are called heterozygous . In heterozygous pairings, one allele is usually dominant, and the other recessive.
When two alleles are both expressed it is called?
If both alleles are dominant, it is called codominance?. The resulting characteristic is due to both alleles being expressed equally. An example of this is the blood group AB which is the result of codominance of the A and B dominant alleles.
What are 2 alleles called?
An organism in which the two copies of the gene are identical — that is, have the same allele — is called homozygous for that gene. An organism which has two different alleles of the gene is called heterozygous.
What is the term for two alleles for a particular locus considered together?
Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent. … Genotypes are described as homozygous if there are two identical alleles at a particular locus and as heterozygous if the two alleles differ.
What is different between two alleles of the same gene?
If the two alleles are the same, the individual is homozygous for that gene. If the alleles are different, the individual is heterozygous.
What term refers to two dominant alleles of a contrasting pair fully expressed at the same time in heterozygous individual?
Closely related to incomplete dominance is codominance, in which both alleles are simultaneously expressed in the heterozygote.
When two alleles are both expressed and the resulting phenotype is a blending of the two traits the condition is called?
Codominance refers to the dominance in which the two alleles or traits of the genotypes (of both homozygotes) are expressed together in offspring (phenotype). There is neither a dominant nor recessive allele in cross-breeding.
What is the term heterozygous mean?
(HEH-teh-roh-ZY-gus JEE-noh-tipe) The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles (compound heterozygote).
Do all genes have 2 alleles?
Individual humans have two alleles, or versions, of every gene. Because humans have two gene variants for each gene, we are known as diploid organisms. The greater the number of potential alleles, the more diversity in a given heritable trait.
What term is used to refer to an organism that has two identical alleles for a particular trait?
Homozygous also refers to a genotype consisting of two identical alleles of a gene for a particular trait. An individual may be homozygous dominant (AA) or homozygous recessive (aa).
Why do we have two alleles for each gene?
Since diploid organisms have two copies of each chromosome, they have two of each gene. Since genes come in more than one version, an organism can have two of the same alleles of a gene, or two different alleles. This is important because alleles can be dominant, recessive, or codominant to each other.
When there are two different alleles present in a heterozygote and both of these alleles are expressed as in blood type This condition is called?
Codominance is a relationship between two versions of a gene.
What is the relationship among the terms allele locus gene and genotype?
Terminology. A specific position along a chromosome is called a locus. Each gene occupies a specific locus (so the terms locus and gene are often used interchangeably). Each locus will have an allelic form (allele). The complete set of alleles (at all loci of interest) in an individual is its genotype.
When two different alleles are present in a heterozygote and both of these alleles are expressed This condition is called?
codominance. 1. Condition in which two alleles of a locus are expressed in a heterozygote; 2. A condition in which both alleles for a gene are fully expressed.