Dominant – An allele whose trait always shows up in the organism when it is present. 3. Gene – The set of information that controls a trait; in the DNA.
What does an allele show?
An allele is a viable DNA (deoxyribonucleic acid) coding that occupies a given locus (position) on a chromosome. Usually alleles are sequences that code for a gene, but sometimes the term is used to refer to a non-gene sequence. An individual’s genotype for that gene is the set of alleles it happens to possess.
What trait only shows up when two of its alleles are present *?
Codominance occurs when two alleles for a gene are expressed equally in the phenotype of heterozygotes. In the case of ABO blood type, IAIB heterozygotes have a unique phenotype, with both A and B antigens in their blood (type AB blood).
What is an allele describe its function?
Alleles are different forms of the same gene which are located on the same part of the chromosome. Genes are made up of information needed to produce different proteins, so alleles carry information to produce different versions of the same protein.
Do alleles make up genes?
A gene is a portion of DNA that determines a certain trait. An allele is a specific form of a gene. Genes are responsible for the expression of traits. Alleles are responsible for the variations in which a given trait can be expressed.
What is the allele that always shows up and hides the weaker allele *?
|trait||characteristic of an organism that makes it unique|
|dominant||the allele that always shows up and hides the weaker allele|
|reccessive||the allelle that is always masked in the presence of the stronger allele|
|heredity||the passing of traits from parent to offspring|
When the alleles for a trait that are present in an organism are not the same?
For example, a fly with the genotype Bb will produce two types of gametes: B and b. In comparison, a fly with the genotype BB will only produce B gametes, and a fly with the genotype bb will only produce b gametes. Figure 10: A monohybrid cross between two parents with the Bb genotype.
When one of the alleles of a heterozygous pair masks the presence of another, recessive allele, it is known as a dominant allele.
When an allele determines the appearance of an organism?
Alleles contribute to the organism’s phenotype, which is the outward appearance of the organism. Some alleles are dominant or recessive. When an organism is heterozygous at a specific locus and carries one dominant and one recessive allele, the organism will express the dominant phenotype.
What do alleles have to do with characteristics?
The combination of alleles that an organism carries constitutes its genotype. 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.
How does an allele different from a gene?
A gene is a unit of hereditary information. Except in some viruses, genes are made up of DNA, a complex molecule that codes genetic information for the transmission of inherited traits. Alleles are also genetic sequences, and they too code for the transmission of traits.
How are alleles represented in genetics?
Alleles are often represented by upper and lower case letters. The upper case letters represent the dominant form while the lower case letters represent the recessive form. The expression of a genotype is called the phenotype.
How are alleles created in the first place?
When SNPs and other mutations create variants or alternate types of a particular gene, the alternative gene forms are referred to as alleles .