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Genetics

QuestionAnswer
Traits physical characteristics like eye or hair color
Heredity The passing of traits from parents to offspring
Genetics Scientific study of Heredity
homozygous organism that has the same 2 alleles for a trait; always produces offspring with the same form of a trait as the parents (purebred) (GG or gg)
Gene factors that control traits (a portion of DNA)
Allele Different forms of a gene (ex. one for short and for tall)
Dominate allele one who's trait always shows up in an organism when the allele is present ( represent with upper case letter)
Recessive allele One whose trait is masked or covered up when the dominate allele is present(lower case)
heterozygous An organism that has 2 different alleles for trait ; hybrid(Gg)
probability Chance that trait will show
Punnett Square Chart that shows all the possible combinations of alleles that can result from a genetic cross
Phenotype physical appearance or visible trait that you can see in the person
Genotype organism's genetic makeup or allele combination, this you can't see( Gg)
Gregor Mendel Father of genetics
DNA -deoxyribonucleic acid- -a chemical molecule that carries all of the cell’s instructions. Code for life.
Double helix Shape of DNA -looks like a twisted ladder
incomplete dominance organisms with two different phenotypes produce offspring with a third phenotype that is a blending of the parental traits. (red x white produces pink)
co dominance Punnett square--Use one capital letter to represent trait, then add a superscript letter to represent the the color. See page 405 in book
co dominance Both of the parental traits appear together in offspring. (red x white produces red and white spots)
incomplete dominance Punnett square--Use 2 different capital letters. Example R for red flowers, W for white flowers. RW would represent the pink flowers. page 405 in book.
Created by: science7th