DNA & Gentics Keywords 0.0 / 5 ? BiologyDNA, genetics and evolutionASAQA Created by: CurlotCreated on: 25-05-15 17:14 Genetic Variation Meiosis helps to bring about variation by crossing over or assortment 1 of 23 Gene A section of DNA that codes for a polypeptide 2 of 23 Exon Coding or expressed sequences. 3 of 23 DNA Deoxyribonucleic acid 4 of 23 Codon A triplet of bases 5 of 23 Chromatid One of two identical strands of material that form a chromosome 6 of 23 Chromosomes A thread-like structure, composed of DNA and protein. Found in the nucleus 7 of 23 Centromere The part of the chromsome that attaches to the spindles during cell division 8 of 23 Allele A different form of a particular gene 9 of 23 Homologus Chromosomes A pair of chromosomes with similar structural features 10 of 23 Intron Non-coding intervening sequence. 11 of 23 Mitosis Cell division producing two daughter cells with a full chromosome number 12 of 23 Meiosis Cell division producing four daughter cells with half the chromsome number 13 of 23 Nucleotide A molecule made from sugar, a phosphate and an organic base 14 of 23 Recombination The broken-off portions of chromatids recombine uring meiosis 15 of 23 Haploid Half the chromosome number (23) 16 of 23 Diploid The constant body number of chromosomes (46) 17 of 23 Locus The fixed position of a gene 18 of 23 Polypeptide Long chain of amino acids 19 of 23 Triplet Code The DNA bases that code for amino acids 20 of 23 Degenerative Code An amino acid with more than one triplet code. 21 of 23 Stop Code A triplet code that does not code for an amino acid 22 of 23 Genetic Diversity The variability within a species due to differences in alleles 23 of 23
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