Punnett Square Quiz Review
_______1. Garden pea plants can have yellow seeds or green seeds. In a pea plant that is
heterozygous for seed color, the allele for yellow seeds masks the effects of the allele for green
seeds.
Which of the following terms best describes the allele for yellow seeds?
A. codominant
B. dominant
C. recessive
D. sex-linked
_______2. Hawaiian happy face spiders from the island of Maui can have
different markings, as shown below. A single gene determines the
markings on the spiders.
A plain spider is crossed with a patterned spider. The patterned spider is
homozygous. The pattern allele is dominant to the plain allele.
What percentage of the offspring from this cross are expected to be
patterned instead of plain?
A. 0%
C.
50%
B. 25%
D.
100%
Draw the Punnett Square
What possible genotypes could be created?
What possible phenotypes could be created?
_______3. In pea plants, the genes for seed color and seed shape are on different chromosomes.
Which of the following explains why the genes for these traits are not inherited together?
A.
B.
C.
natural selection
artificial selection
the law of segregation
D.
the law of independent assortment
4. (CODOMINANCE) A homozygous blood type B person has children with a heterozygous blood type A
person. Draw a square for the cross:
a. Genotypes of the offspring: _______________________________
b. Phenotypes of the offspring: _______________________________
5.
Red flowers (R) are incompletely dominant to white flowers (W). Cross a heterozygous parent with a
white parent.
a. Draw the Punnett
square:
b.
What are all the possible genotypes (alleles) of the offspring?
____________________________
c.
What ratio would you expect those genotypes to appear in?
______________________
d.
What are all the possible phenotypes of the offspring?
_______________________
e.
What ratio would you expect those phenotypes to appear in?
___________
f.
If they have 4 offspring. How many would you expect to be red?
_____