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WorksheetsUnit 3: Genetics
Total questions: 36
Worksheet time: 19mins
Name
Class
Date
1.
In mink, brown fur color is dominant to silver-blue fur color. If a homozygous brown mink is mated with a silver-blue mink and 8 offspring are produced, how many would be expected to be silver-blue?
a)
0
b)
3
c)
6
d)
8
2.
Crossing over is important because....
a)
It prevents mutations from entering the gametes.
b)
It allows for even distribution of chromosomes in the gametes.
c)
It allows for more genetic diversity of gametes.
d)
It allows for genetic uniformity of gametes.
3.
What is another way of saying "true breeding"?
a)
homozygous
b)
dominant
c)
recessive
d)
heterozygous
4.
An organism's appearance or other observable characteristics:
a)
phentoype
b)
genotype
c)
recessive
d)
dominant
5.
An organism's genetic make-up:
a)
phenotype
b)
genotype
c)
dominant
d)
recessive
6.
bb crossed with BB, what is the probability of Bb?
a)
0%
b)
25%
c)
50%
d)
100%
7.
A dog gives birth to 5 puppies. What percentage of the chromosomes does each puppy share with the mother?
a)
25%
b)
50%
c)
75%
d)
100%
8.
Mendel's law of segregation states that during meiosis, the alleles that control each trait separate, and only _________________ from each pair is/are passed to the offspring
a)
one allele
b)
the dominant trait
c)
two alleles
d)
the recessive trait
9.
A female guinea pig homozygous dominant for black fur color is mated with a homozygous for white fur color. In a litter of eight offspring, there would probably be ________
a)
8 black guinea pigs
b)
4 black and 4 white guinea pigs
c)
2 black, 4 gray and 2 white guinea pigs
d)
8 white guinea pigs
10.
Human eggs and sperm are _____, and each has ____ chromosomes.
a)
diploid, 23
b)
diploid, 46
c)
haploid, 23
d)
haploid, 46
11.
The Law of Segregation states that alleles separate during the process of ...
a)
Mitosis
b)
Meiosis
c)
Fertilization
d)
Replication
12.
The cells produced via meiosis are called:
a)
gametes
b)
somatic cells
c)
body cells
d)
skin cells
13.
What is the cause of some traits "skipping" a generation?
a)
dominant traits
b)
recessive traits
c)
hybrid alleles
d)
homologous chromosomes
14.
Recessive alleles may not be expressed because they are
a)
masked by a dominant allele
b)
the least common allele in a population.
c)
the most common allele in a population.
d)
less likely to have crossing over.
15.
Which event during meiosis leads to a reduction in chromosome number from 2n (diploid) to n (haploid)?
a)
Pairs of homologous chromosomes line up at the equator.
b)
DNA undergoes replication.
c)
Homologous chromosomes are pulled to opposite sides of the cell.
d)
Sister chromatids are pulled apart at the centromere.
16.
Crossing over would most likely occur during which stage of the cell cycle?
a)
when DNA is being replicated
b)
when homologous chromomosomes line up in pairs
c)
when centromeres are separated
d)
when cytokinesis begins
17.
What is the role of the spindle fibers?
a)
to join homologous chromosomes together
b)
to store nucleotides prior to DNA synthesis
c)
to initiate the formation of the nuclear membrane
d)
to move chromosomes in the cell
18.
In mice, black is dominant to white color and color is determined by a single gene. Two black mice are crossed. They produce 2 black offspring and one white offspring. If the white offspring is crossed with one of its parents, what percent of the offspring are expected to be white?
a)
0
b)
25
c)
50
d)
75
19.
Mendel took the pollen from a tall pea plant and pollinated the flower of a short pea plant. When he did this, he removed the male parts of the flower on the short plant. Why was it important that he remove the male parts from the flower of the short plant?
a)
because he wanted to prevent self pollination
b)
because the short plant was heterozygous
c)
because he wanted to prevent the development of seeds
d)
because the short plant was not a true-breeding plant
20.
There are no carriers for Huntington's Disease- you either have it or you don't. Is Huntington's disease caused by a dominant or recessive trait?
a)
Dominant
b)
Recessive
21.
Is hitchhiker's thumb dominant or recessive? The carriers are not marked. Should there be carriers in this pedigree?
a)
Dominant
b)
Recessive
22.
Which of the following could only be a result of nondisjunction during meiosis of sperm formation and not egg formation?
a)
XYY
b)
XXX
c)
XXY
d)
XO
23.
What occurs during the process of meiosis in humans that can lead to a child with the condition of Down Syndrome?
a)
production of a duplicate chromosome set
b)
production of gametes which are diploid
c)
production of gametes with one duplicate chromosome
d)
production of gametes with one duplicate sex chromosome
24.
A DNA segment is changed from-AATTAG- to -AAATAG-. This is a ____.
a)
frameshift mutation
b)
substitution
c)
insertion
d)
deletion
25.
A DNA segment is changed from -AATTAGAAATAG- to -ATTAGAAATAG-. This is a ____.
a)
c. inversion
b)
insertion
c)
frameshift mutation
d)
translation
26.
One of the goals of the Human Genome Project is to
a)
increase the number of genes in the human genome
b)
map the location of only the most important genes on each chromosome
c)
clone the entire human genome in bacteria
d)
determine the nucleotide sequence of the entire human genome
27.
To cut DNA molecules into pieces at specific sequences of nucleotides, genetic engineers use
a)
cloning
b)
insulin
c)
bacteria
d)
restriction enzymes
28.
In gel electrophoresis, DNA fragments migrate toward one end of a gel because they are
a)
pulled toward that end by gravity
b)
attracted to complementary DNA fragments at that end of the gel
c)
attracted to the positively charged end of the gel
d)
repelled by hydrophobic molecules at the other end of the gel
29.
Based on these results whose blood was found in the blood stain at the crime scene?
a)
Bob
b)
Sue
c)
John
d)
Lisa
30.
Which two bear species are most closely related?
a)
Bear 1 and Bear 2
b)
Bear 1 and Bear 3
c)
Bear 2 and Bear 3
d)
There’s no way to tell
31.
How do scientists cut DNA into smaller strands?
a)
restriction enzymes
b)
scissors
c)
ligase
d)
agarose
32.
A scientist cloned a goat. Which of these is a true statement about the cloned goat?
a)
It has new genes and traits
b)
It lacks the genes for reproduction
c)
It has the genes that are identical to the original goat
d)
It looks the same but has different genes.
33.
What are 4 components of gel electrophoresis?
a)
Scissors, Electricity, a Buffer and a Microwave
b)
Gel, Electricity, Meiosis and a Buffer
c)
Scissors, Meiosis, a Microwave and Agarose
d)
Gel, Electricity, a Buffer and DNA
34.
What is the ultimate source of genetic variability
a)
inbreeding
b)
hybridization
c)
mutations
d)
radiation
35.
The process of making changes in the DNA code of a living organism is called
a)
selective breeding
b)
genetic engineering
c)
inbreeding
d)
hybridization
36.
Prokaryotes divide by binary fission, a form of asexual reproduction in which
a)
the nucleus divides into two nuclei.
b)
the number of chromosomes in the cell is reduced.
c)
a cell divides into two cells with identical genetic information.
d)
spindle fibers attach to the poles of the cell.
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