A genetic characteristic of an individual is any trait that can be attributed to a hereditary cause, coded for in inherited DNA. Any other trait is derived from environmental causes, either while within the womb or outside of it. It can be very difficult to determine if a characteristic is genetic, congenital but not genetic or acquired after birth.Know More
Generally, any characteristic that appears in one family for several generations is suspected to have a genetic cause. Some genetic characteristics are fairly well-known and uncontroversial. These include such benign traits as hair color, eye color, attachment of earlobes, hair texture and freckles. However, just because a trait has a genetic basis does not mean that a person with that gene will have that characteristic.
Among the genes that cause various characteristics in individuals, some are dominant and some are recessive. For instance, if a person carries genes for brown eyes from her mother and genes for blue eyes from her father, her eyes will normally be brown. This is because the genes for brown eyes are dominant over the genes for blue eyes. When both are present, the maternal genes have more influence. This dominance is usually not total, and some compromise between opposing genes is often the result.Learn more about Molecular Biology & DNA
A multiple allele trait is one of at least three different types of a specific gene, but only two of these types are able to exist in a diploid. A diploid is a type of organism or cell that has two sets of chromosomes, with one set typically from the father and the other from the mother.Full Answer >
A Mendelian trait is controlled by one gene and features a one-two-one genotype ratio and a three-one phenotype ratio. These ratios exist because these genes possess two alleles.Full Answer >
Genetic information is stored in several places, which are DNA molecules, genes, chromosomes, mitochondria and the genome. Different amounts and types of genetic information are stored in these locations. The majority of genetic information is stored within individual DNA molecules, although it is found in other cellular locations as well.Full Answer >
Chromosomes exchange genetic information in the form of genes during the process of meiosis. This process creates both egg and sperm cells in females and males, respectively. During meiosis, crossing over occurs between the chromosomes to exchange genetic information and create unique eggs and sperm.Full Answer >