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.
In this regard, what is the allele combination of an organism?
Genetics Vocabulary Quiz
|phenotype||An organism's physical appearance, or visible traits|
|genotype||An organism's genetic makeup, or allele combinations|
|heterozygous||Describes an organism that has two different alleles for a trait|
|homozygous||Describes an organism with two identical alleles for a trait|
What is the actual combination of alleles of an organism?
Considering the alleles of a gene present in an organism and the physical results, brings us to the terms genotype, phenotype, and trait. An organism's genotype is its specific combination of alleles for a given gene.
Alternative forms of a given gene are called alleles, and they can be dominant or recessive. When an individual has two of the same allele, whether dominant or recessive, they are homozygous. Heterozygous means having one each of two different alleles.
Ch 8 Vocabulary - Mendel & Heredity
|genotype (8-2)||set of alleles that an individual has|
|heredity (8-1)||passing of traits from parents to offspring|
|heterozygous (8-2)||the alleles of a particular gene are different|
|homozygous (8-2)||when the two alleles of a particular gene are the same|
Homologous chromosomes can have different alleles on them. Alleles are variants of the same gene that occur on the same place on a chromosome. (Through a mutation, they are different.) A locus refers to the location on the chromosome where the gene is found.
Recessive and dominant alleles. You will recall that genes have different forms called alleles. An allele can be recessive or dominant. A recessive allele only shows if the individual has two copies of the recessive allele.
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.
Polydactyly is an inherited condition in which a person has extra fingers or toes. It is caused by a dominant allele of a gene. This means it can be passed on by just one parent if they have the disorder.
The dominant homozygote has the genotype RR, while the recessive homozygote has the genotype rr). Having identical alleles for a trait. 2) Carrying two copies of the same allele. Compare to heterozygous.
The terms dominant and recessive describe the inheritance patterns of certain traits. For a recessive allele to produce a recessive phenotype, the individual must have two copies, one from each parent. An individual with one dominant and one recessive allele for a gene will have the dominant phenotype.
So, basically An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles ,one at each genetic locus, with one allele inherited from each parent.
Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait. One example of a recessive inherited trait is a smooth chin, as opposed to a dominant cleft chin.
Ch 10 Mendel and Inheritance. the allele for shortness and the allele for tallness segregated when the F1 plants produced gametes. What principle states that during gamete formation genes for different traits separate without influencing each other's inheritance?
An allele is one of the possible forms of a gene. Most genes have two alleles, a dominant allele and a recessive allele. If an organism is heterozygous for that trait, or possesses one of each allele, then the dominant trait is expressed. So a gene is a particular region of your DNA that controls a specific trait.
A gene is a stretch of DNA or RNA that determines a certain trait. Genes mutate and can take two or more alternative forms; an allele is one of these forms of a gene. For example, the gene for eye color has several variations (alleles) such as an allele for blue eye color or an allele for brown eyes.
Organisms that have two identical alleles for a particular trait are said to be homozygous (AA) or (aa). 6. Organisms that have two different alleles for the same trait are heterozygous (Aa).
Mutations in somatic cells (body cells) cannot be passed on to offspring, but may cause problems such as cancer. Alleles come from other genes through a process known as mutation. They are found on the same place on the chromosomes.
n an allele that produces its characteristic phenotype only when its paired allele is identical. Synonyms: recessive Type of: allele, allelomorph. (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character.
Inheritance of Traits by Offspring Follows Predictable Rules. Genes come in different varieties, called alleles. Somatic cells contain two alleles for every gene, with one allele provided by each parent of an organism.
n an allele that produces the same phenotype whether its paired allele is identical or different. Synonyms: dominant Type of: allele, allelomorph. (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character.
An organism which has two different alleles of the gene is called heterozygous. Phenotypes (the expressed characteristics) associated with a certain allele can sometimes be dominant or recessive, but often they are neither.