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Ch 5 Heredity
Vocabulary
| Term | Definition |
|---|---|
| Heredity | The passing of traits from parents to offsprings |
| genetics | the study of how traits are passed on/inherited |
| Gregor Mendel | Father of modern genetics. An Austrian monk who studied pea plants to learn how traits are passed from parents to offspring. |
| cross-pollination | when sperm in the pollen of one plant fertilize eggs in the flower of another |
| self-pollination | sperm from one plant fertilize the eggs of the same plant |
| characteristic | a feature that has different forms |
| trait | a specific characteristic (ex. height, eye color) |
| dominant trait | the trait that always appear |
| recessive trait | the trait that is hidden (goes away) |
| genes | instructions for an inherited trait. offsprings have 2 sets; one from each parent |
| alleles | different versions of a gene. Dominant alleles are given a capital letter and recessive alleles are given a lower case letter |
| phenotype | an organisms physical appearance |
| genotype | the combination of alleles that an organism gets from its parents/genetic makeup |
| homozygous | a plant with 2 dominant or 2 recessive alleles |
| heterozygous | a plant with one dominant allele and one recessive allele |
| incomplete dominance | traits that do not blend together |
| Punnett square | used to predict the possible genotypes of offspring from certain parents |
| probability | the mathematical chance that something will happen |
| asexual reproduction | only one parent is needed to produce offspring |
| sexual reproduction | 2 parents join to form offspring |
| homologous chromosome | a pair of chromosomes that carry the same sets of genes |
| sex cells | cells that join to make offsprings |
| meiosis | a copying process that produces cells with half the number of chromosomes |
| sex chromosomes | carry genes that determine sex |
| pedigree | a tool for tracing a trait though generations of a family |
| selective breeding | breeding plants and animals to produce a desired trait. |