What refers to an individual with two different alleles for a trait?
having the same allele at the same locus on both members of a pair of homologous chromosomes. 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).
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.
- 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.
- The physical appearance of an organism as distinguished from its genetic makeup. The phenotype of an organism depends on which genes are dominant and on the interaction between genes and environment. Compare genotype.
- An organism can be homozygous dominant, if it carries two copies of the same dominant allele, or homozygous recessive, if it carries two copies of the same recessive allele. Heterozygous means that an organism has two different alleles of a gene.
Heterozygous. A diploid organism is heterozygous at a gene locus when its cells contain two different alleles (one wild-type allele and one mutant allele) of a gene. The cell or organism is called a heterozygote specifically for the allele in question, and therefore, heterozygosity refers to a specific genotype.
- Copies of genes are referred to as "alleles," and because of the way reproduction works, the alleles can carry identical copies of a gene or different copies, depending on what is passed on by each parent. Identical alleles means that a person's genotype for that trait is homozygous.
- There are several patterns that account for the inheritance of traits. These include Mendelian or monogenetic, where one gene causes one trait; pleiotropic, where one gene is responsible for multiple traits; and polygenic or multifactorial, where two or more genes are required to produce one trait.
- A trait that is controlled by more than one gene is called polygenic which translates to "multiple genes". The genes work together to make one trait. Examples are skin, eye and hair color. In that case one gene has more than two alleles. An example of multiple alleles is blood type.
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).
- 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).
- Organisms that have two unlike genes for a certain trait are called hybrid. A pea plant with one recessive gene for shortness and one dominant gene for tallness is a hybrid for that trait. A hybrid is called heterozygous, as it has two different alleles.
- When the gene for one trait exists as only two alleles & the alleles play according to Mendel's Law of Dominance, there are 3 possible genotypes (combination of alleles) & 2 possible phenotypes (the dominant one or the recessive one).
Updated: 11th December 2019