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chapter11
| term | definition |
|---|---|
| Meiosis | The process in which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes in a diploid cell. |
| Crossing-over | The process in which homologous chromosomes exchange portions of their chromatids during meiosis. |
| Zygote | A fertilized egg. |
| Homologous | The term used to refer to chromosomes in which one set comes from the male parent and one set comes from the female parent. |
| Diploid | The term used to refer to a cell that contains two sets of homologous chromosomes. |
| Haploid | The term used to refer to a cell that contains only a single set of genes. |
| Codominance | A situation in which the phenotypes produced by both alleles are completely expressed. |
| Incomplete dominance | A situation in which one allele is not completely dominant over another allele. |
| Multiple alleles | A gene that has more than two alleles. |
| Polygenic traits | A trait controlled by two or more genes. |
| Independent assortment | One of Mendel's principles that states that genes for different traits can segregate independently during the formation of gametes. |
| Probability | The likelihood that a particular event will occur. |
| Homozygous | Having two identical alleles for a particular gene. |
| Heterozygous | Having two different alleles for a particular gene. |
| Phenotype | The physical characteristics of an organism. |
| Genotype | The genetic makeup of an organism. |
| Segregation | The separation of alleles. |
| Gametes | Sex cells. |
| Genetics | The scientific study of heredity. |
| Fertilization | The process in sexual reproduction in which male and female reproductive cells join to form a new cell. |
| Trait | A specific characteristic of an individual. |
| Gene | A factor that is passed from parent to offspring. |
| Allele | One of a number of different forms of a gene. |
| Principle of dominance | States that some alleles are dominant and others are recessive. |