Can genes be neither dominant nor recessive?

Another form of simple inheritance is possible which is neither dominant nor recessive and in which the heterozygote alone is affected. In this system, homozygosity for the normal allele AA, and the mutant allele A’A’, give a normal phenotype.

What are homozygous and heterozygous alleles?

Homozygous: You inherit the same version of the gene from each parent, so you have two matching genes. Heterozygous: You inherit a different version of a gene from each parent.

How many types of alleles are there?

two alleles
Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent. Each pair of alleles represents the genotype of a specific gene.

Which allele is dominant?

A dominant allele is denoted by a capital letter (A versus a). Since each parent provides one allele, the possible combinations are: AA, Aa, and aa. Offspring whose genotype is either AA or Aa will have the dominant trait expressed phenotypically, while aa individuals express the recessive trait.

Is EE heterozygous or homozygous?

The individual is homozygous for the trait when it has two identical alleles. In the example above about earlobes, both the EE and ee individuals are homozygous for the trait. The person with the Ee genotype is heterozygous for the trait, in this case, free earlobes.

Is white a dominant color?

The white skin color gene is recessive, so if you have one white parent and one black parent, your skin color will be more similar to your black parent than your white parent. Same goes for Asian parents and Amerindian parents. However, the white skin color is dominant over SOME other skin tones.

What is a dominant allele and recessive allele?

Dominant refers to the relationship between two versions of a gene. Individuals receive two versions of each gene, known as alleles, from each parent. If the alleles of a gene are different, one allele will be expressed; it is the dominant gene. The effect of the other allele, called recessive, is masked.