Cellular control - important terms 0.0 / 5 ? BiologyCellular processesA2/A-levelOCR Created by: Steff06Created on: 24-04-16 17:49 Genotype The genetic make-up of an organism. Describes alleles an organism contains. 1 of 11 Homozygous An organism with two identical allele for a particular gene. 2 of 11 Heterozygous An organism with two different alleles of the same gene. 3 of 11 Autosomes All the chromosomes apart form the sex chromosomes. 4 of 11 Phenotype Characteristics that are expressed in the organism. Determined by genotype and environment. 5 of 11 Dominant allele Always expressed in the phenotype, even if a different allele for the same gene is present in the genotype. 6 of 11 Recessive allele Only expressed in the phenotype in the presence of another identical allele or in the absence of a dominant allele. 7 of 11 Codominant Two genes that are both expressed in the phenotype of a heterozygote. 8 of 11 Linkage Two or more genes that are located on the same chromosome. 9 of 11 Crossover Alleles from one chromatid become linked to alleles on the other chromatid. 10 of 11 Sex-linkage Characteristic is sex-linked if the gene that codes for it is found on one of the sex (X and Y) chromosomes. 11 of 11
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