1. Complementation – Cross 1 making the heterozygous males
Male Parent
genotype
Hermaphrodite Parent
genotype X
Female gametes
Male gametes
Progeny genotype
Progeny phenotypes
and ratios

2. Complementation – mutations in different dpy genes
Male Parent
genotype
Hermaphrodite Parent
genotype X
Female gametes
Male gametes
Progeny genotype
Progeny phenotypes
and ratios
WHY might there be some Dpy hermaphrodites?

3. Complementation – mutations in the same dpy gene
Male Parent
genotype
Hermaphrodite Parent
genotype X
Female gametes
Male gametes
Progeny genotype
Progeny phenotypes
and ratios
Why are we looking for Dpy males when the mutations are in the same gene?

4. Symbols to Know for Crosses
a//a – a is the allele and // represents the chromatids – there are two for a diploid organism – sometimes written as /
a b//a b – two different genes on the same chromosome
a//a ; b//b – two different genes on different chromosomes
X – symbolizes mating between two different individuals
X - symbolizes a self cross – when the hermaphrodite worms fertilize their own eggs