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Genetics
Genetics Definitions
Term | Definition |
---|---|
Homozygous recessive | A gene that is expressed only in the homozygous state : ee, qq, ww |
Homozygous dominant | A gene that is always expressed : AA, KK, TT |
Heterozygous | Genotypes made up of two different alleles : Dd, Jj, Ss |
Phenotype | Physical characteristics |
Genotype | The pairs of genes that make up a trait |
Complete dominance | The dominant allele completely covers the recessive allele : RR+rr+Rr |
Incomplete dominance | Neither allele dominates so a new phenotype is shown |
Codominance | Both alleles are shown : red cow + white cow = red and white spotted cow |
Diploid | The two sets of chromosomes we inherit from our parents. Twice the haploid number. |
Haploid | When a cell has half the number of chromosomes after Meiosis. |
Somatic Cells | The cells that mitosis produces |
Carrier | A person who has inherited the recessive allele but does not show the trait |