Genetics 0.0 / 5 ? BiologyDNA and inheritanceIGCSEEdexcel Created by: SmoggyCreated on: 02-04-15 09:37 Inheritance the transmission of genetic information in the form of genes from one generation to the next 1 of 13 Gene a length of the genetic material DNA that codes for the manufacture of a particular protein. 2 of 13 Chromosome a molecule (strand) of DNA associated with proteins consisting of about 1000 genes inherited as a unit e.g. the X and Y chromosomes. 3 of 13 Allele one or more alternative forms of a gene occupying the same position on a chromosome 4 of 13 Genotype he genetic makeup of an organism, the alleles for a particular gene that the organism has 5 of 13 Phenotype the characteristics (physical features or chemical makeup) of an organism 6 of 13 Homozygous having two identical alleles of a gene 7 of 13 Heterozygous having two different alleles of a gene 8 of 13 Dominant allele the allele that is always expressed in the phenotype if it is present 9 of 13 Recessive allele the allele that is only expressed in the phenotype in the absence of the dominant allele 10 of 13 Diploid nucleus a nucleus containing a pair of each chromosome. 11 of 13 Haploid nucleus a nucleus containing one of each pair of chromosomes 12 of 13 Mutation a spontaneous change in a gene or a chromosome. 13 of 13
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