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Genetic crosses
| Term | Definition |
|---|---|
| Allele | Different forms of the same gene |
| Autosomes | Chromosomes that don't determine sexuality |
| Dihybrid cross | Involves the study of two characteristics (in a genetic cross) |
| Dominance | A dominant gene stops a recessive gene from being expressed |
| Fertilisation | The fusion of two haploid gametes to form a diploid zygote |
| Genotype | The genetic make up of an organism |
| Heterozygous | Two different allele (Rr) |
| Homozygous | Two of the same allele (RR) |
| Incomplete dominance | There is no dominant or recessive allele and the heterozygous condition produces an intermediate phenotype |
| Law of independent assortment | At gamete formation, either pain of alleles is equally likely to combine with either of another pair of allele |
| Linkage | Genes located on the same chromosome |
| Locus | The position of a gene on a chromosome |
| Monohybrid cross | A single trait cross |
| Law of segregation | Characteristics are controlled by a pair of allele and these alleles separate at gamete formation |
| Non-nuclear inheritance | DNA found outside the nucleus in the mitochondria or chloroplast |
| Pedigree | A diagram showing the genetic history of a group of related individuals |
| Phenotype | The physical appearance of an organism |
| Progeny | The offspring that are produced by a cross |
| Recessive | A gene that isn't expressed in the presence of a dominant gene |
| Sex linked | A characteristic controlled by a gene on the sea chromosomes |
| Somatic cells | Diploid cells which are not gametes |
Created by:
christinaronan
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