Genetics for Dummies
For Dummies Provided by Hunter & Skye
What is the study of Genetics?
Who discovered Genetics and how did he do this?
Examples of Genes
Not Genes Examples
The Difference between Dominant & Recessive Alleles.
Dominant: Observed trait of an organism that masks the recessive form of a trait.
Recessive: Trait of an organism that can be masked by the dominant form of a trait.
The Difference Between Heterozygous & Homozygous.
Heterozygous: When there are two different alleles for a trait.
Homozygous: When there are two identical alleles for a trait.
The Difference Between Genotype & Phenotype.
Genotype: Combination of genes in an organism
Phenotype: Outward appearence
Punnett Square
This is a simple cross Punnett Square. A resembles the gene for tallness. a resembles the gene for shortness.
In this example:
- AA (Tall) = 25%
- aa (Short) = 25%
- Aa (Tall) = 50%
Therefore this person will have a 75% chance of being tall & a 25% being short.
What is Incomplete Dominance?
Incomplete dominance is the appearance in a heterozygote of a trait that is intermediate between either of the trait's homozygous phenotypes. - Dictionary.com
What is Codominance?
Codominance is the genetics of or pertaining to two different alleles that are fully expressed in a heterozygous individual.
What are Multiple Alleles?
Multiple alleles are a code of DNA that help determine the sex of the infant(s).