Biology
Unit 2 - Genetics
Williams
Name _________________________________________________ Date: ________________________ Hr: _____________
Exam 1 Study Guide
1. Define the following terms:
a. Phenotype
b. Genotype
c. Homozygous
d. Heterozygous
e. Dominant
f. Recessive
g. Allele
h. Co-dominance
i.
Incomplete dominance
j.
Autosomal traits
k. X-linked traits
2. Complete a punnett square for a cross between two individuals who are
heterozygous for the trait.
Biology
Unit 2 - Genetics
Williams
Name _________________________________________________ Date: ________________________ Hr: _____________
3. Complete a punnett square for a cross between two individuals who are
heterozygous for two traits.
4. Without completing a punnett square, determine the probability of the offspring
possessing the following traits. The parents are heterozygous for three traits.
(AaBbCc)
a. What is the probability the offspring will be heterozygous for all three traits?
b. What is the probability that the offspring will be dominant (phenotypically)
for all three traits?
c. What is the probability that the offspring will be dominant for the first two
traits, but recessive for the third?
d. What is the probability that the offspring will be heterozygous for the first
trait, homozygous recessive for the second trait, and homozygous dominant
for the third trait?
Biology
Unit 2 - Genetics
Williams
Name _________________________________________________ Date: ________________________ Hr: _____________
5. Describe the features of the following modes of inheritance.
a. Autosomal recessive
b. Autosomal dominant
c. X-linked recessive
d. X-linked dominant
6. For traits with incomplete dominance:
a. A red flower is crossed with a blue flower, what are the phenotypes of their
offspring?
b. If two of these offspring are crossed, what are the genotypes and phenotypes
of their offspring?
7. For traits with co-dominance:
a. A red flower is crossed with a blue flower, what are the phenotypes of their
offspring?
b. If two of these offspring are crossed, what are the genotypes and phenotypes
of their offspring?