Symbols to Know for Crosses

1. 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

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

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

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

5. F1 parent self cross X F1 gametes F2 Progeny genotype F2 Progeny phenotypes and ratios

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

7. Series 1: One Autosomal, One x-linked F1 parent self cross X F1 gametes F2 Progeny genotypes F2 Progeny phenotypes and ratios