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- Dominant, as related to genetics, refers to the relationship between an observed trait and the two inherited versions of a gene related to that trait. Individuals inherit two versions of each gene, known as alleles, from each parent. In the case of a dominant trait, only one copy of the dominant allele is required to express the trait.
What is the difference between dominant and recessive traits? Dominant traits are always expressed when the connected allele is dominant, even if only one copy of the dominant trait exists. Recessive traits are expressed only if both the connected alleles are recessive.
- Inheritance Example
- Other Types of Genetic Dominance
- Disorders and Diseases
- References
With respect to eye color, the allele for brown eyes (B) is dominant, and the allele for blue eyes (b) is recessive. If a person receives dominant alleles from both parents (BB) she will have brown eyes. If she receives a dominant allele from one parent and a recessive gene from the other (Bb) she will also have brown eyes. But if she receives rece...
Incomplete Dominance
When a parent has a homozygous trait (RR) that cannot completely dominate the other parent's differenthomozygous trait (WW), the genotype of both parents is said to be incompletely, or partially, dominant. Neither parent's dominant trait can overtake the other parent's dominant trait, and characteristics from both parents merge in the offspring. This results in a new, blended trait (phenotype) with a heterozygous genotype that can then be passed on to future offsprings. An example of incomple...
Codominance
With codominant genes, both characteristics from both parents are seen. For example, in the camellia shrub, flowers can be red or white, but if a plant receives its genes from two parent plants, one with white flowers and one with red, its flowers will have splotches of both red and white. As with incomplete dominance, recessive alleles are never present in either parent when codominance occurs.
Mixed Dominance
Some characteristics can be mixtures of the types of dominance described above. Human blood types are an example. A and B blood types are codominant. If a child receives the A blood type from one parent and the B blood type from the other, he will be type AB. This blood type has characteristics that are a mixture of type A and type B. However, both A and B are dominant over type O, another blood type. So if this child were instead to receive A from one parent and O from the other, he will be...
Some human diseases are hereditary. If one or both parents have a heritable disease, it may be passed down to a child. Genetic abnormalities may be passed down on dominant alleles (autosomal dominant inheritance) or recessive alleles (autosomal recessive inheritance). It is possible for a person to be a carrier of a disease but not have symptoms of...
Heredity: Crash Course Biology #9 - Crash Course on YouTubePatterns of Inheritance - OpenStax CollegeApr 27, 2017 · A dominant trait is an inherited characteristic that appears in an offspring if it is contributed from a parent through a dominant allele. Traits, also known as phenotypes, may include features such as eye color, hair color, immunity or susceptibility to certain diseases and facial features such as dimples and freckles.
The terms dominant and recessive describe the inheritance patterns of certain traits. That is, they describe how likely it is for a certain phenotype to pass from parent offspring. Sexually reproducing species, including people and other animals, have two copies of each gene.
Capital letters represent dominant alleles and lowercase letters represent recessive alleles. The phenotypic ratios are the ratios of visible characteristics. The genotypic ratios are the ratios of gene combinations in the offspring, and these are not always distinguishable in the phenotypes.
Sep 17, 2023 · Capital letters represent dominant alleles and lowercase letters represent recessive alleles. The phenotypic ratios are the ratios of visible characteristics. The genotypic ratios are the ratios of gene combinations in the offspring, and these are not always distinguishable in the phenotypes.
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The dominant/recessive character is a relationship between two alleles and must be determined by observation of the heterozygote phenotype. Figure 6.5.2 Allele for Purple Flowers (P) is Completely Dominant Over Allele for White Flowers (p) [Long description]
