In the case of humans, since each individual is formed by the union of the eggs and sperm cells of both parents, diploid cells are developed that contain the necessary genetic material to create him. This genetic material consists of chromosomes with a single gene or allele that contains a specific trait. For each trait, an individual acquires two copies of the gene or allele, one from the mother and one from the father.
The offspring are homozygous if the two alleles from the two parents are similar, and heterozygous if they are different, in which case the stronger of the latter will appear in descendants, while the weaker one is masked.
Alleles or genes that appear are called “dominant” and alleles that are masked are called “recessive”. A recessive allele, or gene, occurs only when the offspring inherit the recessive copy of the trait from both parents.
A dominant gene is usually one that is frequently observed in offspring and passed on to offspring, while a recessive gene is only shown for a few generations and eventually disappears. Dominant genes are represented by uppercase letters, and recessive genes are represented by lowercase letters. There are three combinations of genotypes or alleles: AA (dominant traits from both parents), Aa (dominant traits from one parent and recessive traits from the other) and aa (recessive traits from both parents) ).
Eye color is an example where a dominant gene masks a recessive gene. If one parent has brown eyes and the other has blue eyes, brown is the dominant color and blue is the recessive color.
“AA” means the offspring will have brown eyes receiving the dominant gene from both parents; “Aa,” he will have brown eyes with the recessive gene masked by the dominant; and “aa,” because he has the recessive gene from both parents sex gene, he will have blue eyes.
In the case of an individual’s hair type, if both parents have straight hair, the offspring will definitely have straight hair. If one parent has curly hair and the other straight, the offspring can have straight, curly, or curly hair depending on the genetic makeup of both parents’ alleles.
1. A person receives two copies of every trait he inherits from his parents, one from the mother and one from the father, one of which is explicit and the other implicit.
2. A dominant gene is a strong gene, while a recessive gene is a weak gene.
3. The dominant gene will appear in the trait, while the recessive gene, although still present, is masked or hidden by the dominant gene.
4. A recessive gene will appear only if the offspring inherits the parent’s recessive gene.
5. The dominant gene is most likely to be passed on to offspring, while the recessive gene will slowly disappear.