Name: 
 

Genetics


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

1. 
Which term refers to physical characteristics that are studied in genetics?
a.
traits
b.
offspring
c.
generations
d.
hybrids
 

2. 
Factors that control traits are called
a.
genes.
b.
purebreds.
c.
recessives.
d.
parents.
 

3. 
The different forms of a gene are called
a.
alleles.
b.
factors
c.
masks.
d.
traits.
 

4. 
Scientists call an organism that has two different alleles for a trait a( Hint They have one dominant and one recessive Trait)
a.
hybrid.
b.
trait.
c.
purebred.
d.
factor.
 

5. 
What does the notation TT mean to geneticists?
a.
two dominant alleles
b.
two recessive alleles
c.
at least one dominant allele
d.
one dominant and one recessive allelle
 

6. 
What does the notation tt mean to geneticists?
a.
two dominant alleles
b.
two recessive alleles
c.
at least one dominant allele
d.
one dominant and one recessive allelle
 

7. 
What does the notation Tt mean to geneticists?
a.
two dominant alleles
b.
two recessive alleles
c.
at least one recessive allele
d.
one dominant allele and one recessive allelle
 

8. 
What is probability?
a.
the actual results from a series of events
b.
the likelihood that a particular event will occur
c.
the way the results of one event affect the next event
d.
the number of times a coin lands heads up
 

9. 
What did Mendel predict was the probability of producing a tall plant from a genetic cross of two hybrid tall plants?( Hint Draw a punnett square)
a.
one in four
b.
two in four
c.
three in four
d.
four in four
 

10. 
What does a Punnett square show?
a.
all the possible outcomes of a genetic cross
b.
only the dominant alleles in a genetic cross
c.
only the recessive alleles in a genetic cross
d.
all of Mendel's discoveries about genetic crosses
 

11. 
If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?
a.
25 percent
b.
50 percent
c.
75 percent
d.
100 percent
 

12. 
An organism's physical appearance is its
a.
genotype
b.
phenotype
c.
codominance
d.
heterozygous
 

13. 
An organism's genotype is its
a.
genetic makeup
b.
feather color
c.
physical appearance
d.
stem height
 

14. 
An organism that has two identical alleles for a trait isHint 2 capital or 2 recessive alleles)
a.
codominant.
b.
tall.
c.
homozygous.
d.
heterozygous.
 

15. 
A heterozygous organism has
a.
three different alleles for a trait.
b.
two identical alleles for a trait.
c.
only one allele for a trait.
d.
two different alleles for a trait.
 

16. 
What does codominance mean in genetics?
a.
Both alleles are dominant.
b.
Both alleles are recessive.
c.
The alleles are neither dominant nor recessive.
d.
Each allele is both dominant and recessive.
 

17. 
What is the genetic code?
a.
the order of nitrogen bases along a gene
b.
the number of nitrogen bases in a DNA molecule
c.
the order of amino acids in a protein
d.
the number of guanine and cytosine bases in a chromosome
 

18. 
Which combination of sex chromosomes results in a male human being?
a.
XX
b.
YY
c.
XY
d.
either XX or YY
 

19. 
What genetic disorder results in abnormally shaped blood cells?
a.
hemophilia
b.
Down syndrome
c.
cystic fibrosis
d.
sickle-cell disease
 

20. 
Which genetic disorder causes the body to produce unusually thick mucus in the lungs and intestines?
a.
hemophilia
b.
Down syndrome
c.
cystic fibrosis
d.
sickle-cell disease
 

21. 
John has 2 blue marbles, 2 black marbles and 2 pink marbles in a bag. What are the chances of picking 1 black marble ?
a.
16.6 %
c.
33.3%
b.
50 %
d.
0%
 

22. 
Bob has a cool 12 sided dice. They are numbered 1 through 12. What are the chances of rolling a 6 ?
a.
12 %
c.
50 %
b.
8.3 %
d.
25 %
 

23. 
During which stage of the cell cycle do the chromosomes appear ?
a.
Prophase
c.
Metaphase
b.
cytokinesis
d.
IDK
 



 
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