Control, Genomes and Environment key words 0.0 / 5 ? BiologyDNA, genetics and evolutionA2/A-levelOCR Created by: EmilyknoxknoxCreated on: 07-04-16 16:47 Gene A piece of DNA coding for a polypeptide and determines a specific characteristic 1 of 22 Allele Variant form of a gene 2 of 22 Recessive Allele only expressed when homozygous 3 of 22 Dominant Allele if present is switched on/expressed 4 of 22 Homozygous Organisms cells have identical alleles for a gene 5 of 22 Heterozygous Cells have different alleles for a gene 6 of 22 Genotype Genetic constitution of an organism 7 of 22 Phenotype Expression of the genotype and interaction with the environment 8 of 22 Homogametic sex Human females, ova is single X (and always is X) 9 of 22 Heterogametic sex Human males, X or Y in sperm 10 of 22 Monohybrid inheritance Genetic cross for one gene 11 of 22 Dihybrid inheritance Genetic cross for two genes 12 of 22 F1 generation First set of offspring from genetic cross 13 of 22 F2 generation Second set of offspring from genetic cross 14 of 22 Locus Specific location of gene on a chromosome 15 of 22 Sex chromosomes Females have ** and males have XY 16 of 22 Sex linkage Genes carried ion sex chromosomes, inheritance differences in males and females 17 of 22 Test cross Identifying unknown genotypes 18 of 22 Pure breeding Homozygous for particular gene, self fertilised to produce identical offspring 19 of 22 Multiple alleles Gene has more than two allele types 20 of 22 Phenotype ratio Proportions of a phenotype occurring 21 of 22 Codominance Both alleles expressed in phenotype 22 of 22
OCR F215 Control, Genomes and the Environment revision PPT. 5.0 / 5 based on 1 rating Teacher recommended
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