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Practice Questions Unsolved with Dihybrid Crosses.
Typology: Exercises
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Name: __________________________________________ Date: ______________________ Period: ______
For the first two questions, determine the following:
Determine the parent gene types.
Determine the possible gene pairs donated by each parent. Fill in the Punnett square.
Determine the possible offspring phenotypes.
Example:
A tall green pea plant that is homozygous dominant for both traits is crossed with a short yellow pea plant that is homozygous recessive for both traits. Show the test cross.
Parent 1 = (T T G G)
Parent 2 = (t t g g)
Parent 1: TG, TG, TG, TG
Parent 2: tg, tg, tg, tg
T G T G T G T G
t g
t g
t g
t g
Determine offspring phenotypes
Tall/Green______ : Tall/Yellow______ : Short/Green_______ : Short/Yellow______
TtGg TtGg TtGg TtGg
TtGg
TtGg
TtGg
Possible phenotypes
Long/Yellow____ : Long Orange ____ : Short/Yellow ____ : Short/Orange____
What percentage of the offspring will lack mates because they have both slow head bobbing and yellow throats?
What percentage of the offspring will have trouble finding mates because because they lack one of the dominant traits?
What will be the phenotype of the F 1 generation?
What will be the genotypic ratio of the F 2 generation?