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science chapter 3
| Term | Definition |
|---|---|
| heredity | is the passing of physical characteristics from parents to offspring hint hint heredity |
| trait | a specific characteristic hint hint trait |
| genetics | mendel experiments with thousands of peas hint hint genetics |
| fertilization | sperm cells and a egg joins together hint hint fertilization |
| purebred | organisms offspring of many generations that have the same form of a trait hint hint purebred |
| gene | factors control trait hint hint gene |
| allele | are the different forms of a gene hint hint allele |
| dominate allele | is one whose trait always shows up in the organism when the allele is present hint hint dominate allele |
| recessive allele | on the other hand is hidden whenever the dominant allele is present hint hint recessive allele |
| hybrid | organisms has two different allele for a trait hint hint hybrid |
| probability | a number that describes how likely it is that an event will occur hint hint probability |
| punnett square | is a chart that shows all the possible ways alleles can combine in a genetic cross hint hint punnett square |
| phenotype | is a physical appearance hint hint phenotype |
| genotype | organisms alleles hint hint genotype |
| homozygous | an organism that has two identical alleles for a hint hint homozygous |
| heterzygous | an organism that has two different alleles for a trait hint hint heterzygous |
| incomplete dominance | occurs when one allele is only partially dominant hint hint incomplete dominance |
| codominance | occurs when both alleles for a gene are expressed equally hint hint codominance |
| multiple alleles | which means that three or more possible alleles determine the trait hint hint multiple alleles |
| polygenic inheritance | occurs when more then one gene affects a trait hint hint polygenic inheritance |
| meiosis | is the process by which the number of chromosomes is reduced by half as sex cells form hint hint meiosis |