2. • The mating of two
individuals,
organisms, or strains
that have different
gene pairs that
determine three
specific traits or in
which three
3. Example:
23 = 8 * 8 = 64
MEANING:
• The fork line method can be used
by figuring the occurrence of each
gene or set of genes to be found in
the gamete, and then multiply
them together.
• This can be multiplied by figuring
each trait or combination of
traits separate for both the male
4. P1: WWGG * ww gg
F1: Ww Gg * Ww Gg
F2: Ww * Ww Gg * Gg
WW Ww Ww ww GG Gg Gg gg
Phenotypes:
¾W ¾ G = 9/16 WG
¼ g = 3/16 Wg
¼ w ¾ G = 3/16 wG
¼ g = 1/16 wg
Phenotypic ratio:
9:3:3:1