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GENETICS
MIDTERM/FINAL EXAMINATION
NAME: ________________________________
Course, Year & section: _________________

Score: ________
Date: _________

Multiple Choice
...

1
...
flowering patterns
c
...
gamete formation
d
...
The chemical factors that determine traits are called
a
...
traits
c
...
characters
3
...
not inherited by offspring in the next generation
b
...
determined by dominant factors only
d
...
When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited
a
...
an allele for tallness and an allele for shortness
c
...
an allele from only the tall parent
5
...
the allele for tall plants is recessive
b
...
the allele for tall plants is dominant
d
...

6
...
If the tall F1 pea plants are allowed to selfpollinate
a
...
all of the offspring will be tall
...
all of the offspring will be short
d
...
If in the P2 generation both heterozygous tall plants were bred, the probability that
an F2
plant will be tall is
a
...
75%
c
...
100%
8
...
hybrid
c
...
homozygous
d
...
In the Punnett square shown in Figure 1, which of the following is true about the
offspring resulting from the cross? (TT x Tt)

a
...
All are expected to be short
c
...
All are expected to be tall
10
...
2TT:2Tt
b
...
2tall:2short
d
...
The phenotypic ratio of the offspring in Figure 1 is:
a
...
1TT:2Tt:1tt
c
...
4 tall
12
...
principle of dominance
b
...
principle of probabilities
d
...
How many different allele combinations would be found in the gametes produced
by a
pea plant whose genotype was RrYY?
a
...
4
c
...
16
14
...
2
b
...
8
d
...
The number of chromosomes in a gamete is represented by the symbol
a
...
X
c
...
Y
16
...
12
b
...
24
d
...
Gametes have
a
...

b
...

c
...
one allele for each gene
18
...
mitosis
b
...
crossing-over
d
...
What is shown in Figure 2?
a
...
anaphase I of meiosis
b
...
Replication
20
...
prophase of meiosis I
c
...
interphase
d
...
What happens between meiosis I and meiosis II that reduces the number of
chromosomes?
a
...

c
...
Additional replication occurs
...
No additional replication occurs
22
...
diploid cells
...
haploid cells
c
...
body cells
23
...
two genetically identical cells
...
four genetically different cells
c
...
two genetically different cells
...
In a 2 factor cross where both parents are heterozygous for both traits (TtYy x TtYy),
the

expected phenotypic ratio would be:
a
...
12:4
c
...
9:3:3:1
25
...
3:1
b
...
2:2
d
...
The principle of independent assortment states that ____________________ for
different
traits can segregate independently during the formation of gametes
...
sex cells
b
...
chromosomes
d
...
Where two alternatives for a trait are tall and short, and tall is dominant, the
genotype of
a heterozygous individual would be expressed
a
...
ss
c
...
Ss
28
...
genotype
b
...
phenotype
d
...
Centromeres are
a
...
Starting points for DNA replication
c
...
Sequences of nucleotides found at ends of chromosomes
“You’re never a loser til you quit trying
...
A plant that has purple flowers is crossed with one that has white flowers
...
What were the genotypes of the parents?
a
...
Pp x Pp
c
...
PP x WW
b
...

31
...

a
...
anaphase
b
...
telophase
32
...
prophase
c
...
metaphase
d
...
Which of the following processes that occur in meiosis are the causes of variation in
humans
...
independent assortment
c
...
crossing-over
d
...
A phase in mitosis where chromosomes are pulled to center of cell or the
equatorial plate
...
prophase
c
...
metaphase
d
...
In this stage of interphase, all the enzymes necessary to aid in the cell division are
produced
...
Gap 1
c
...
Gap 2
d
...
During this stage in the interphase, all the organelles and cytoplasmic components
including the centrioles replicate
...
Gap 1
c
...
Gap 2
d
...
This important checkpoint ensures that all the kinetochores are attached to the
spindle
fibers before it proceed to the anaphase stage
...
G1/S checkpoint
C
...
G2/M checkpoint
D
...
This trait usually appears in the generation and masks the other trait
...
dominant
c
...
recessive
d
...
This is the masked or hidden trait
...
dominant
c
...
recessive
d
...
TT and tt are both ___________ genotypes
...
dominant
c
...
recessive
d
...
How many sperms will develop from 1800 secondary spermatocytes?
A
...
3,600
C
...
5,400
42
...
twelve
B
...
6 thousand
D
...
eleven oogonia? (A
...
22
C
...
28)
44
...
7
B
...
14
D
...
What happens in the Gap 2 (G2) phase of interphase?
A
...

B
...

C
...

D
...

46
...
Independent Assortment
C
...
Crossing-over
D
...
In Telophase II of meiosis,
A
...
Tetrads move toward the center or the equatorial plate
C
...
crossing over takes place
48
...

A
...
23
C
...
47
49
...

A
...
23
C
...
47
50
...
A phase in the cell cycle where DNA replicates
...
All the organelles and cytoplasmic components including the centrioles replicate
...
All the enzymes necessary to aid in the cell division are produced
...
Spindle fibers are formed

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