3. DNA DNA is a double helix formed by base pairs attached to a sugar-phosphate backbone. http:// ghr.nlm.nih.gov/handbook/illustrations/dnastructure
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7. Genes - small fragment of DNA in a chromosome where a piece of genetic (hereditary) info is stored - gene locus = place on the chromosome where the gene resides; controls a particular trait e.g. colour, height, etc.
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9. Genotype = the specific combination of alleles; represented by letters Phenotype = what trait looks (acts) like
10. Pair of homologous chromosomes A gene locus A pair of alleles 3 pairs of alleles Test yourself
14. C c Fertilization produces heterozygous offspring meiosis II meiosis I (chromosomes duplicated before meiosis) Homozygous dominant parent Homozygous recessive parent gametes gametes Mendel’s Theory of Segregation C C C C C C C C C C C C C C c c c c c c c c c c c c c c