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Ch 4 Sec 1,2,3,4
vocab
| Question | Answer |
|---|---|
| The passing of traits from parents to offspring | heredity |
| A characteristic that an organism can pass on to its offspring through its genes | trait |
| The scientific study of heredity | genetics |
| The joining of a sperm and an egg | fertilization |
| The offspring of many generations that have the same traits | purebred |
| The set of information that controls a trait | gene |
| The different forms of a gene | alleles |
| An allele whose trait always shows up in the organism when the allele is present | dominant allele |
| An allele that is masked when a dominant allele is present | recessive allele |
| An organism that has two different alleles for a trait | hybrid |
| A number that describes how likely it is that an event will occur | probobility |
| A chart that shows all possible combinations of alleles that can result from a genetic cross | Punnett square |
| An organisms physical appearence or visible traits | phenotype |
| An organisms genetic makeup, or allele combinations | genotype |
| Having two of the same alleles for a trait | homozygous |
| having two different alleles for a trait | heterozygous |
| A condition in which neither of two alleles of a gene are dominant or recessive | codominance |
| The process by which the number of chromosomes is reduced by half to form sex cells | meiosis |
| Takes the code from the nucleus to the ribosome in the cytoplasm | messenger RNA |
| The RNA that encodes the code of the messenger RNA to make the proteins | transfer RNA |
| Any change in a gene or trait | mutation |