In classic genetics: AA or Aa for autosomal dominance; for sex-linked dominance, females will need XX or Xx, while males will need Xy
It gets more complicated with epistasis and other factors that modulate the genes.
A homozygous dominant genotype contains two dominant alleles. For example, in humans, being able to roll the tongue into a U shape is dominant, and not being able to roll the tongue is recessive. Lets assign the letter R for the dominant allele and the letter r for the recessive allele. A homozygous dominant individual would have the homozygous dominant genotype, RR.
An individual with two recessive alleles will have the recessive phenotype (eg. bb, tt, rr)
Homozygous dominant and heterozygous genotypes will produce the dominant phenotype.
AA or Aa
An Aa genotype can result in the same phenotype as either an AA or AA genotype, if one of the alleles acts in a dominant fashion. If the A allele is dominant over the a allele, then the phenotype of a heterozygous (Aa) individual will be the same as the phenotype of a homozygous dominant (AA) individual.
To determine the genotype of an individual that shows the dominant phenotype you would cross that individual with one that is homozygous recessive. A monohybrid cross of two individuals that are heterozygous for a trait exhibiting complete dominance would probably result in a phenotype ratio is 3 dominant 1 recessive.
The genotype AA represents a homozygous dominant genotype. The capital letter "A" represents the dominant allele, while the lowercase letter "a" would represent the recessive allele. If both dominant alleles are present in a genotype (homozygous dominant) then the phenotype is "A" phenotype. If one dominant allele and one recessive allele are present (heterozygous dominant) then the phenotype is "A". Finally, if both recessive alleles "a" are present (homozygous recessive) then the phenotype is "a". Therefore, the answer to your question is the genotype AA would result in an "A" phenotype because the genotype is homozygous dominant.
the Phenotype is the direct result of the genotype and the environment...... genotype + environment = Phenotype
Yes. the phenotype is the visible manifestation of a genotype. In the example of fruit flies, if red eyes are dominant and white eyes recessive, than the genotypes "AA" and "Aa" will give a dominant phenotype of red eyes. Conversely, a recessive "aa" will give a phenotype of white eyes.
An Aa genotype can result in the same phenotype as either an AA or AA genotype, if one of the alleles acts in a dominant fashion. If the A allele is dominant over the a allele, then the phenotype of a heterozygous (Aa) individual will be the same as the phenotype of a homozygous dominant (AA) individual.
To determine the genotype of an individual that shows the dominant phenotype you would cross that individual with one that is homozygous recessive. A monohybrid cross of two individuals that are heterozygous for a trait exhibiting complete dominance would probably result in a phenotype ratio is 3 dominant 1 recessive.
The genotype AA represents a homozygous dominant genotype. The capital letter "A" represents the dominant allele, while the lowercase letter "a" would represent the recessive allele. If both dominant alleles are present in a genotype (homozygous dominant) then the phenotype is "A" phenotype. If one dominant allele and one recessive allele are present (heterozygous dominant) then the phenotype is "A". Finally, if both recessive alleles "a" are present (homozygous recessive) then the phenotype is "a". Therefore, the answer to your question is the genotype AA would result in an "A" phenotype because the genotype is homozygous dominant.
Genotype relates to the genetic makeup of an individual, and refers to all the genes on your chromosomes, whereas phenotype refers to the physical attributes that exist as a result of the genotype. Taking eye colour as an example, your phenotype will be brown eyes, and your genotype will be the two genes (one from the sperm and one from the egg). Only one of these two genes (the dominant one) will contribute toward your phenotype.
the Phenotype is the direct result of the genotype and the environment...... genotype + environment = Phenotype
Yes. the phenotype is the visible manifestation of a genotype. In the example of fruit flies, if red eyes are dominant and white eyes recessive, than the genotypes "AA" and "Aa" will give a dominant phenotype of red eyes. Conversely, a recessive "aa" will give a phenotype of white eyes.
Genotype is the allele combination and phenotype is the physical appearance of the result of the genotype. Genotype for tallness may be: Tt Phenotype example: Brown hair, blue eyes, widow's peak, etc.
Phenotype
Genotype is the alleles (different forms of a gene) which an individual has with respect to a particular characteristic. The Phenotype is how these genes are expressed in an individual.
a phenotype is the physical characteristics of an organism based on its genotype.
The observable trait that appears in an organism as a result of its genetic makeup is called a phenotype. Its underlying genetic makeup is referred to as the genotype.
When genes are expressed, the result is called phenotype. What is actually in all the genes (some are recessive) is called the genotype.