homozygous(different gene)-Rr
heterozygous(same gene)-RR,rr
Capital letters usually denote dominant alleles. Therefore QQ genotype would contain two dominant alleles for the Q genotype.
When the genotype is neither homozygous nor heterozygous, it typically indicates incomplete dominance or codominance. In incomplete dominance, the two different alleles are neither dominant nor recessive, resulting in a blending of phenotypes. In codominance, both alleles are expressed fully in the phenotype, leading to distinct traits from each allele being visible.
Blood type is determined by the presence of specific alleles for the ABO blood group system. There are three main alleles: A, B, and O. The A and B alleles are co-dominant, meaning that if both are present (genotype AB), both antigens are expressed on the red blood cells. The O allele is recessive, so an individual must have two O alleles (genotype OO) to express the O blood type.
There is only one possible blood genotype that gives group O. The person must be homozygous for type O.
The mating of organisms with different homozygous alleles for a single trait is referred to as a monohybrid cross. In this scenario, one parent possesses two dominant alleles (homozygous dominant), while the other has two recessive alleles (homozygous recessive). The offspring produced from this cross will be heterozygous, displaying the dominant trait, while the recessive trait will not be expressed in the phenotype. This type of cross is often used to illustrate basic principles of Mendelian inheritance.
Capital letters usually denote dominant alleles. Therefore QQ genotype would contain two dominant alleles for the Q genotype.
In genetics, homozygous genes are identical alleles, while heterozygous genes have different alleles. For example, TT(same alleles) is homozygous genotype, while Tt (different alleles) is a heterozygous genotype.
A homozygous gene has identical alleles. Homozygous means the individual has two copies of the same allele for a particular gene.
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.
Hybrid
When the genotype is neither homozygous nor heterozygous, it typically indicates incomplete dominance or codominance. In incomplete dominance, the two different alleles are neither dominant nor recessive, resulting in a blending of phenotypes. In codominance, both alleles are expressed fully in the phenotype, leading to distinct traits from each allele being visible.
A Phenotype, physical appearance.
Capital letters usually denote dominant alleles. Therefore QQ genotype would contain two dominant alleles for the Q genotype.
Recessive. Dominant alleles are expressed in both homozygous and heterozygous individuals (DD or Dd), but recessive alleles are only expressed in homozygous individuals (dd).
variation in alleles of genes, occurs both within and among populations. Genetic variation is important because it provides the genetic material for natural selection. Genetic variation is brought about by mutation, which is a permanent change in the chemical structure of a gene. Polyploidy is an example of chromosomal mutation. Polyploidy is a condition wherein organisms have three or more sets of genetic variation (3n or more).
Phenotypes are the traits expressed by the genotype. So, for blood type, a person can have A and i alleles (genotype). However, in the phenotype, since i is recessive, only the A will be expressed, and the person will have an A blood type.
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