Genetics Quiz #1 Study Guide
1. Define the following terms:

Mendel:

Synapsis:

Tetrad:

Homologous chromosomes:

Mendel’s Laws:

Allele:

Gene:

Genetics:

Genotype:

Heredity:

Heterozygous:

Homozygous:

Hybrid:

Purebred:

Phenotype:

Recessive:

Dominant:

Trait:

P=

Punnett square:
F1 =
F2 =
2. During which phases do(es) ______ occur:
a. Synapsis __________________
b. Independent assortment _________
c. Crossing over __________________
d. Tetrads separate_________________
e. Sister chromatids separate ______________
3. Explain what happens during each phase of mitosis. Keep track of the chromosome
number through the phases.
Interphase
(before
Meiosis I):
Prophase I
Prophase II
Metaphase I
Metaphase II
Anaphase I
Anaphase II
Telophase I
Telophase
4. What has to occur before Meiosis I?
5. What is the end result of Meiosis I?
6. What is the end result of Meiosis II?
7. Are the following genotypes homozygous (ho) or heterozygous (he)?
FF _____
Dd _____
BB _____
Ee _____
Tt ______
8. Tall height is dominant over short. Give the genotype(s) for the following:
Tall _________________
Short __________________
9. Short hair in bulldogs is dominant over long hair. Give the phenotype for the
following:
Hh ___________
HH ____________
hh ____________
10. In fruit flies, long wing is dominant over vestigial (short) wing. If two flies heterozygous for
this trait are crossed, what are the phenotypic and genotypic ratios for their offspring?
11. In squash, the allele for white fruits (W) is dominant over the allele (gene) for yellow (w). If
a white-fruited plant is crossed with a yellow-fruited plant and all the offspring are yellow,
what are the possible genotypes of the parents and the offspring?
a. Parents genotype
____________
b. Offspring genotype ____________
12. The genetic disease called cystic fibrosis is inherited through a recessive gene. If both
parents are heterozygous for this trait, what is the probability that they will have a child who
suffers from this disease?
13. Pea plants can have either yellow pods or green pods; green is dominant over yellow. Cross
a heterozygous green pea plant and a yellow pod pea plant. State the offspring probabilities.
a. Genotype
_____________
b. Phenotype _____________
14. In rabbits, gray fur is dominant to white fur and black eye color is dominant over red eye
color. A male rabbit homozygous for gray fur and red eyes is crossed with a female rabbit
homozygous for white fur and heterozygous for black eyes. Determine the phenotypic ratios of
the offspring.
How many will have gray fur & black
eyes? _________
How many will have gray fur & red
eyes? _________
How many will have white fur & black
eyes? _________
How many will have white fur & red
eyes? _________
15. In rabbits, gray fur is dominant to white fur and black eye color is dominant over red eye
color. A male rabbit heterozygous for both fur and eye color is crossed with a female rabbit
heterozygous for both fur and eye color. Determine the phenotypic ratios of the offspring.
How many will have gray fur & black
eyes? _________
How many will have gray fur & red
eyes? _________
How many will have white fur & black
eyes? _________
How many will have white fur & red
eyes? _________
16. If a blue footed spotted booby is crossed with a red footed striped booby and they give birth
to 100 babies, all of which are blue footed & striped, answer the following questions – you do
NOT need to make a punnett square:
a.
b.
c.
d.
e.
What is the dominant allele for foot color? ______________________
What is the dominant allele for pattern? _______________________
What is the genotype of the parent that is blue footed & spotted? ____________________
What is the genotype for the parent that is red footed & striped? ____________________
What is the genotype for the offspring? __________________________