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Biology 3201
Review
Name:________
Part A
Indicate whether the sentence or statement is true or false
1. Mendel restricted his observations to specific contrasting characteristics of pea plants
2. The phenotype is the appearance of the organism
3. The genotype is determined by the phenotype
4. A diploid organism is homozygous if it contains two different alleles of the same gene
5. It is possible to have more than two alleles for one gene
6. In drosophila Melangastor9fruit flies), eye color is an example of multiple alleles
7. In snapdragons, red flowering plants combine with white flowering plants to produce pink
flowering plants. This is an example of co-dominance
8. In a cross between a red shorthorn cow and a white cow, a roan calf was produced. This is an
example of co-dominance
9. A dihybrid cross is used to determine if the original F1 was pure-bred or hybrid
10. The probability of two heterozygous individuals having an offspring heterozygous for that gene
is ½
Part B
Circle the correct answer
1. Mendel’s first law ( the Law of segregation) states that
a. The dominant form of a trait will appear in every generation
b. Members of different pairs of genes behave differently during meiosis
c. Genes are carried in pairs and separate during meiosis to be disturbed into different sex
cells
d. If genes of separate chromosomes they are inherited independently of each other
2. What name did Mendel give to the chromosomes that seemingly disappear for a generation
a. Dominant
b. Recessive
c. Homozygous
d. Heterozygous
3. If the parents of the f1 are SS and ss then the F2 will be
e. All Ss
f.
½ Ss and ½ SS
g. ½ ss and ½ Ss
h. ¼ SS, ½ Ss and ¼ ss
4. Use the A-B-O method of blood typing in humans to answer the question. How many
phenotypes exist for this method of blood typing?
i.
1
j.
2
k. 4
l.
5
5. The cross that would yield some organisms homozygous for both genes is.
m. TTrr X TTrr
n. TtRr X ttRR
o. TtRr x ttRr
p.
TTrr X ttRr
Part C
Place the correct word in the space provided
1.
Alternative forms of the same gene controlling a given characteristic are called ________
2.
If an organism is heterozygous for a trait, the allele that is not expressed in the phenotype is said
to be ________
3.
A cross breeding of organisms in which only one characteristic is being studied is called a
_______
4.
If a diploid organism contains two identical alleles of the same gene, the individual is said to
be_______
5.
An organism genetic makeup is called its_______
6.
The production of offspring by two closest related parents is called ______
7.
The mating of different varieties of plants is a process known as________
8.
A gene which has more than two allele’s forms is said to have ______
9.
If a brown bull and a white cow have all brown and white calves color is probably inherited in a
manner known as _______
10.
A cross between a pure breeding pea [plant with yellow round peas and a pure breeding plant
with green wrinkled seeds is an example of a ____________ cross
Part D
Answer the following questions in the space provided
1. List 4 reasons why Mendel chose to work with pea plants.
2. What was Mendel able to conclude from his observations that a pair of factors , or alleles
separate or segregate during formation of sex cells/
3. Give an example in humans of multiple alleles
4. Determine the F2 phenotypes if the F1 cross was between a red snapdragon and a white
snapdragon. Colour in snapdragons is an example of incomplete dominance
5. What type of cross was Mendel conducting when he crossed pea plants that produce yellow
round seeds with a pea plant that produced green wrinkled
6. Predict the phenotypes of the offspring from a dihybrid cross between a pure breeding pea
plant with yellow round seeds and a pure breeding pea plant with green wrinkled seeds. In pea
plants yellow is dominant over green and round is dominant over wrinkled.
7. In pea plants, tall plants are dominant over dwarf plants and yellow seed coats are dominant
over green seed coats.
a. Show the results of a cross between a pure bred tall pea plant that produced yellow seeds and a
dwarf pea plant that produces green seeds
b. What would the results be if you crossed two plants from the F1 generation?
8. A man with type A blood is dating a woman type B blood. The woman has a child with type a
blood. The man claims the child cannot be his because both he and the female would produce a
type AB child between them. Is the man correct? Is it possible for the child to be his? Show how
you would tell.