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Science Chapter 3

Interactive Science Book 2

TermDefinition
Heredity The passing of physical characteristics from parents to offspring.
Trait What it looks or acts like.
Genetics The study of heredity.
Fertilization When a new organism begins to form when egg and sperm cells join in the process.
Purebred When an animal has the same trait from generations ago.
Gene Factors that control traits.
Allele Are the different forms of a gene.
Dominant Allele One whose trait always shows up in the organism when the allele is present.
Recessive Allele Is hidden when ever the dominant allele is present.
Hybrid An organism that has to different allele for a trait.
Probibilaty A number on how likely something is to occur.
Punnet square A chart that shows all the possible ways allele can combine in a genetic cross.
Phenotype Physical traits.
Genotype Its genetic makeup or allele.
Homozygous An organism that has two identical allele for a trait.
Heterozygous An organism that has two different allele for a trait.
Incomplete Dominance Occurs when one allele is only partial dominant.
Codominance Occurs when both alleles for a gene are expressed equally.
Multiple Alleles When three or more alleles determine the trait.
Polygenic Inheritance Occurs when more than one allele affects the trait.
Meiosis The process in which the number of chromosomes is reduced by half as sex cell forms.
Created by: mwels11341