WORKSHEET PATTERNS OF
HEREDITY
Answer the Following questions.
1. Complete the Punnet square for a cross
between a homozygous red-flowered
snapdragon (RR) and a homozygous
white-flowered snapdragon (rr). Give
the ratio for the phenotype and the
genotype
Key
genotype _________________
RR – red
rr – white
Rr – pink
F1
phenotype ________________
2. What happens to the phenotype of the heterozygotes when traits are
inherited in an incomplete dominance pattern?
_____________________________________________________________
3. Complete the Punnet Square for a cross between two F1 plants (Rr).
Give the phenotype ratio for the F2 generation.
Possible genotypes and phenotypes.
F2
% red ______% pink______% white_______
_____________________________________________________________
4. Complete the Punnet square for a cross between a black chicken (BB)
and a white chicken (WW). Give the genotype and phenotype of the
offspring in the F1 generation.
Key
BB – black
WW – white
F1
BW – checkered
Genotypes and Phenotypes possible ______________________________
5. What is the name of the inheritance pattern in which both alleles are
expressed equally?
Tell whether the questions 6-11 show incomplete dominance or codominance.
6. Yellow Guinea pigs are crossed with white guinea pigs and produce
cream offspring.
7. Radishes can be long, round, or oval.
8. Birds can be black, blue, or blue with black feathers.
9. A mouse can be black, white, or gray.
10. A grasshopper can have red stripes, yellow stripes, or red and yellow
checkers.
11.In shorthorn cattle, when a red bull (RR) is crossed with a white cow
(rr),all the offspring are roan(Rr)-a spotted, red and white or milky red
color.
12.Show the cross of matting a roan bull (see above) with a roan cow.
a. List the genotypes and phenotypes of all
offspring.
13.Show the cross of a red snapdragon with a pink snapdragon.
b. List the genotypes and phenotypes of all offspring