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BIOL 239 (260)


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University of Waterloo
BIOL 239
Christine Dupont

Lec1: mendelian genetics 15. Phenotype: observable characteristics, introduce generational lines Cross-fertilize, even self-fertilize Version or variant of gene 17. for single gene: 2 traits, still there but not expressed 18. Chromosomes from either parent, homologous chromosomes (same gene, same order, not exact same DNA sequence, diff. alleles but same gene come from diff. dna sequence) 19. italicized means the gene/allele/dna, not protein product 2 chromosomes of pea, diploid; look at texture of pea; 2 copies of dominant allele; phenotype is smooth Genotype is heterozygous but still smooth, but for homozygous recessive is wrinkled 20. multiple alleles of genes. Polymorphic: many different versions, how frequent do you see those versions in a population Monomorphic: many genes in metabolic processes eg. Sickle cell anemia, mutant gene; other versions are at really low frequency, eg. Tsacs, Huntington 21. genes come in pairs 22. female: homo. Dominant Male: homo. Recessive Since both homo. Punnet squares: possible consequences are all heterozygous; all monohybrids PS shows possibilities, not all the offsprings, not actual # of babies 24. offspring are all heterozygous, all yellow peas 25. only one option, monohybrids, heterozygous consequences For both heterozygous, phenotypically: 1:2:1, genotypically: 3:1 28. 29. for texture (SBE1), not in italics, know if talking about gene or protein If change amino acid sequence, mutate gene and cause inactive SBE1 Active enzyme results into smooth, for inactive enzyme cannot branch sequence, insoluble goes to smooth and soluble to wrinkled 30. if bind, not soak up a lot of water, when pea dries out stays smooth. For insoluble, water gets packed, when pea dries out, water evaporates, so pea shrinks and shrivels up Packing in branched starch, heterozygous plants end up with smooth texture due to insoluble branches MEMORIZE THE RATIOS
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