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Dec 20, 2023 · Each gene is made up of two alleles, one inherited from each parent. In the case of a recessive gene, the trait only manifests if both alleles are recessive. The inheritance of recessive traits is known as hereditary. When it comes to the actual causes of a recessive gene, it all boils down to the genotype.
- How Are Traits determined?
- How Are Traits Inherited?
- Dominant Traits vs. Recessive Traits
- Other Examples of Weird Inherited Traits
- Sources
Traits are determined by an individual's genotype, the summation of the genes in our DNA. A gene is a portion of a chromosome. A chromosome is composed of DNA and contains the genetic material for an organism. Humans have twenty-three pairs of chromosomes. Twenty-two of the pairs are called autosomes. Autosomes are typically very similar in males a...
How are traits passed from one generation to the next? This happens when gametes unite. When an egg is fertilized by a sperm, for each chromosome pair, we receive one chromosomefrom our father and one from our mother. For a particular trait, we receive what is known as an allelefrom our father and one allele from our mother. An allele is a differen...
When alleles are expressed via simple dominant versus recessive traits, the specific alleles inherited determine how the phenotype is expressed. When an individual has two dominant alleles, the phenotype is the dominant trait. Likewise, when an individual has one dominant allele and one recessive allele, the phenotype is still the dominant trait. W...
A longer second toe and attached earlobes are often cited as examples of a "weird trait" that follows the two dominant/recessive alleles forms of one gene inheritance. Again, however, evidence suggests that both attached earlobe and longer second toe inheritance are quite complex.
“Attached Earlobe: The Myth.” Myths of Human Genetics, udel.edu/~mcdonald/mythearlobe.html.“Observable Human Characteristics.” Nutrition & the Epigenome, learn.genetics.utah.edu/content/basics/observable/.- Regina Bailey
Dec 20, 2023 · Dominant traits are those that are expressed in an individual even if they only have one copy of the allele, while recessive traits require two copies of the allele to be expressed. Determining whether a trait is dominant or recessive can be difficult, particularly when dealing with complex traits influenced by multiple genes.
Finding the cause of a trait can be tricky. In the early 1900s, a disease called pellagra (pell-AG-ruh) became common in the southern United States. Pellagra causes severe skin rashes, stomach problems, severe depression, and dementia. The disease was common in families, so some doctors thought it was genetic.
Pedigree analysis. While adoption and twin studies can suggest a genetic or non-genetic cause for a trait, tracking a trait through multiple generations of an extended family can provide additional information. Pedigrees are pictorial representations of a family tree, used to track phenotypes (or sometimes genotypes) through a family.
Dec 20, 2023 · Genetic traits can exhibit a wide variation within a population due to the presence of different alleles, or variations of a particular gene. For example, the gene responsible for eye color can have multiple alleles, resulting in various shades of brown, blue, green, or gray. This variation adds diversity and uniqueness to the human population.
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How are traits inherited?
How are traits determined?
What are genetic traits?
How are traits determined in genetic inheritance?
How do environmental factors affect genetic traits?
An unaffected individual cannot have any alleles of a dominant trait (because a single allele of a dominant trait causes an individual to be affected). Individuals marrying into the family are assumed to have no disease alleles – they will never be affected and can never be carriers of a recessive trait (because the trait is rare in the population).
