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21 terms

Russell~ Chapter 3 test

STUDY
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Heredity
The passing of traits from parents to offspring.
Trait
a specific characteristic that an organism can pass to its offspring through its genes.
Genetics
a specific study of heredity
Fertilization
The process in sexual reproduction in which an egg and a sperm cell join to form a new cell.
Purebred
An offspring of many generations that has the same form of an trait.
Gene
A sequence of DNA that determines a trait and is passed from parent to offspring.
Allele
The different forms of a gene.
Dominate allele
An allele trait that always shows up in the oragnism when the allele is present.
Recessive allele
The allele that is hidden whenever the dominat allele is present.
Hybrid
An offspring of cross that has two different alleles for traits.
Probability
An number that describe how likey or an event will occur.
Punnet square
A chart that shows all the possible of alleles that can result from a genetic cross.
Phenotype
An organism physical appearence or physical traits.
Geneotype
An organism genetic make up or allele combinations.
Homozygous
having two identical alleles for a particular gene.
Heterozygous
Having two different alleles for a particular gene.
Incomplete dominace
Situation in which one allele is not completely dominate over another allele.
Codominace
A situation in which both alleles for genes are expressed equally.
Multiple alleles
Three or more possible alleles of a gene that determine a trait.
Polygenic in heritance
The inheritance of traits that are controlled by two or more genes.
meiosis
The process that occurs in the formation of sex cells.