DIHYBRID CROSS
Mendel’s Peas
A dihybrid cross involves the
observation of two traits simultaneously.
Let’s consider two pea plant characteristics: color
of the peas and the texture of the peas.
Alleles: R = round
r = wrinkled
Y = yellow
y = green
We will start with a parental generation pure
bred for both dominant and recessive alleles.
Pure bred plants are homozygous.
One parent = homozygous dominant
One parent = homozygous recessive
What about the F1 offspring?
What different types of gametes can
a RrYy individual form?
(pollen or egg cells)
Mendel Dihybrid F1 cross
RrYy
x
RrYy