1. Template for Crosses Female Parent Male Parent genotype genotype X
Female gametes
Male gametes
F1 Progeny genotype
and ratios
F1 Progeny phenotypes
Which progeny are you continuing with? Why?

2. F1 parent X
self cross
F1 gametes
students can show Punnet Square
F2 Progeny genotype
F2 Progeny phenotypes
and ratios

3. 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