Are your traits dominant?

Genetic Traits

Genetic traits are the characteristics of an organism that are determined by its genes. These traits can be physical, such as eye color or hair color, or they can be behavioral, such as personality traits. Traits can be inherited from the previous generation and passed onto the next.

genetic shapes



Dominant and Recessive Traits

Genetic traits are inherited from both parents. Each parent contributes one allele, or copy, of each gene to their offspring. If the two alleles are the same, the offspring is said to be homozygous for that gene. If the two alleles are different, the offspring is said to be heterozygous for that gene.

Dominant traits are those that are expressed in the offspring even if the offspring only has one copy of the gene. Recessive traits are only expressed in the offspring if the offspring has two copies of the gene.


Some examples of dominant and recessive traits in humans include:

  • Dominant traits:
    • Brown eyes
    • Straight hair
    • Dark skin
    • Right-handedness
  • Recessive traits:
    • Blue eyes
    • Curly hair
    • Fair skin
    • Left-handedness


The Laws of Mendelian Genetics

The inheritance of genetic traits is governed by the laws of Mendelian genetics. These laws state that:

  • Each parent contributes one allele for each gene to their offspring.
  • The combination of alleles determines the phenotype of the offspring.
  • The genotype of an organism is the combination of alleles that it has for a particular gene.
  • The phenotype of an organism is the observable characteristics of the organism.



Genotype and phenotype are two important concepts in genetics. Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable characteristics of an organism.


  • The genotype of an organism is determined by the alleles it inherits from its parents.
  • Alleles are different forms of a gene.
  • Each organism has two alleles for each gene, one inherited from each parent.
  • The genotype of an organism can be homozygous or heterozygous.
  • A homozygous organism has two identical alleles for a gene.
  • A heterozygous organism has two different alleles for a gene.


  • The phenotype of an organism is determined by its genotype and its environment.
  • The environment can affect the expression of genes, which can lead to different phenotypes.
  • Some phenotypes are controlled by a single gene, while others are controlled by multiple genes.
  • Some phenotypes are also influenced by environmental factors.