Symbols to Know for Crosses a/a – a is the allele and / represents the two chromatids – there are two alleles for a diploid organism a b/a b – two different genes on the same chromosome a/a ; b/b – two different genes on different chromosomes ; designated separate chromosomes X – symbolizes mating between two different individuals X - symbolizes a self cross – when the hermaphrodite worms fertilize their own eggs + is the wild type or non-mutant form of a gene

Series 1: Autosomal Unlinked Female Parent genotype Male Parent genotype X Male gametes Female gametes F1 Progeny genotypes Which progeny are you continuing with? Why? F1 Progeny phenotypes and ratios +/+ ; +/+ dpy/dpy; unc/unc

Series 1: Autosomal Unlinked F1 parent Xself cross F1 gametes F2 Progeny genotype F2 Progeny phenotypes and ratios students can show Punnet Square

Series 1: Autosomal Linked Female Parent genotype Male Parent genotype X Male gametes Female gametes F1 Progeny genotype Which progeny are you continuing with? Why? F1 Progeny phenotypes and ratios + + / + + dpy unc/dpy unc

F1 parent Xself cross F1 gametes F2 Progeny genotype F2 Progeny phenotypes and ratios

Series 1: One Autosomal, One x-linked Female Parent genotype Male Parent genotype X Male gametes Female gametes F1 Progeny genotype Which progeny are you continuing with? Why? F1 Progeny phenotypes and ratios +/+ ; +/0 gene-1/gene1; x-gene2/x-gene2

F1 parent Xself cross F1 gametes F2 Progeny genotypes F2 Progeny phenotypes and ratios Series 1: One Autosomal, One x-linked