Patterns of inheritance: key words 0.0 / 5 ? BiologyPatterns of inheritanceA2/A-levelOCR Created by: Esme.BCreated on: 16-01-18 11:02 Genotype? The alleles possessed by an organism, 1 of 17 Phenotype? Observable characteristics of an organism (result of interaction between its genotype + environment) 2 of 17 Allele? An alternative versions of a gene 3 of 17 Homozygous? Possessing the same alleles, i.e- AA or aa 4 of 17 Heterozygous? Possessing different alleles, i.e- Aa 5 of 17 Dominant? Allele always expressed in phenotype whether homozygous (NN) or heterozygous (Nn) 6 of 17 Recessive? Allele only expressed in phenotype if no dominant allele present i.e homozygous (nn) 7 of 17 Codominant? Both alleles expressed in the phenotype of a heterozygote. 8 of 17 Monogenic? A cross between two parents for one characteristic (gene) 9 of 17 Dihybrid? Involving 2 gene loci 10 of 17 Multiple Alleles? 3 or more alleles at one gene locus 11 of 17 Sex linkage? When a gene that codes for a characteristic is located on one of the sex chromosomes (usually the X) 12 of 17 Autosomal Linkage? Gene loci on the same chromosome (non-sex chromosome) which are often inherited together. 13 of 17 Epistasis? Interaction of gene loci where one masks the expression of another. 14 of 17 Test-cross? Dominant phenotype crossed with individual of recessive phenotype= expected ratio is 1:1=50% or 0.5 15 of 17 Multiple alleles? Characteristics for which there are three or more alleles in the populations gene pool. i.e - blood type 16 of 17 Codominance? Both alleles present in the genotype of a heterozygous individual contributes to the individuals phenotype. 17 of 17
OCR F215 Control, Genomes and the Environment revision PPT. 5.0 / 5 based on 1 rating Teacher recommended
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