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Quiz: Chapter 11 (Introduction to Genetics)



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

1. 

Linked genes
a.
are never separated.
b.
assort independently.
c.
are on the same chromosome.
d.
are always recessive.
 

2. 

Gametes are produced by the process of
a.
mitosis.
b.
meiosis.
c.
crossing-over.
d.
replication.
 

3. 

If a pea plant has a recessive allele for green peas, it will produce
a.
green peas if it also has a dominant allele for yellow peas.
b.
both green peas and yellow peas if it also has a dominant allele for yellow peas.
c.
green peas if it does not also have a dominant allele for yellow peas.
d.
yellow peas if it does not also have a dominant allele for green peas.
 

4. 

A cross of a red cow with a white bull produces all roan offspring. This type of inheritance is known as
a.
incomplete dominance.
b.
polygenic inheritance.
c.
codominance.
d.
multiple alleles.
 

5. 

Mendel concluded that traits are
a.
not inherited by offspring.
b.
inherited through the passing of factors from parents to offspring.
c.
determined by dominant factors only.
d.
determined by recessive factors only.
 

6. 

Mendel’s principles of genetics apply to
a.
plants only.
b.
animals only.
c.
pea plants only.
d.
all organisms.
 

7. 

The principles of probability can be used to
a.
predict the traits of the offspring produced by genetic crosses.
b.
determine the actual outcomes of genetic crosses.
c.
predict the traits of the parents used in genetic crosses.
d.
decide which organisms are best to use in genetic crosses.
 

8. 

How many different allele combinations would be found in the gametes produced by a pea plant whose genotype was RrYY?
a.
2
b.
4
c.
8
d.
16
 

9. 

Organisms that have two identical alleles for a particular trait are said to be
a.
hybrid.
b.
homozygous.
c.
heterozygous.
d.
dominant.
 

10. 

What are Mendel’s factors called today?
a.
alleles
b.
traits
c.
genes
d.
characters
 
 
  
Tt
  
T
t





TT

T

TT

Tt

T

TT

Tt

T
=
tall
t
=
short

Figure 11-1
 

11. 

In the Punnett square shown in Figure 11-1, which of the following is true about the offspring resulting from the cross?
a.
About half are expected to be short.
b.
All are expected to be short.
c.
About half are expected to be tall.
d.
All are expected to be tall.
 

12. 

If you made a Punnett square showing Mendel’s cross between true-breeding tall plants with true-breeding short plants, the square would show that the offspring had
a.
the genotype of one of the parents.
b.
a phenotype that was different from that of both parents.
c.
a genotype that was different from that of both parents.
d.
the genotype of both parents.
 

13. 

What does a Punnett square NOT show?
a.
all possible results of a genetic cross
b.
the genotypes of the offspring
c.
the alleles in the gametes of each parent
d.
the actual results of a genetic cross
 

14. 

The principle of dominance states that
a.
all alleles are dominant.
b.
all alleles are recessive.
c.
some alleles are dominant and others are recessive.
d.
alleles are neither dominant nor recessive.
 
 
quiz_chapter_11_files/i0170000.jpg

Figure 11-3
 

15. 

What is shown in Figure 11-3?
a.
independent assortment
b.
anaphase I of meiosis
c.
crossing-over
d.
replication
 

16. 

When you flip a coin, what is the probability that it will come up tails?
a.
1/2
b.
1/4
c.
1/8
d.
1
 
 
RrYy
  

RY

Ry

rY

ry
 
 

RY

RRYY

RRYy

RrYY

RrYy
Seed Shape
R – round
r – wrinkled


RrYy

Ry

RRYy

RRyy

RrYy

Rryy


Seed Color
Y – yellow
y – green

rY

RrYY

RrYy

rrYY

rrYy
 

ry

RrYy

Rryy

rrYy

rryy
 

Figure 11-2
 

17. 

The Punnett square in Figure 11-2 shows that the gene for pea shape and the gene for pea color
a.
assort independently.
b.
are linked.
c.
have the same alleles.
d.
are always homozygous.
 

18. 

When Mendel crossed true-breeding tall plants with true-breeding short plants, all the offspring were tall because
a.
the allele for tall plants is recessive.
b.
the allele for short plants is dominant.
c.
the allele for tall plants is dominant.
d.
they were true-breeding like their parents.
 

19. 

If two genes are on the same chromosome and rarely assort independently,
a.
crossing-over never occurs between the genes.
b.
crossing-over always occurs between the genes.
c.
the genes are probably located far apart from each other.
d.
the genes are probably located close to each other.
 

20. 

Unlike mitosis, meiosis results in the formation of
a.
diploid cells.
b.
haploid cells.
c.
2N daughter cells.
d.
body cells.
 

21. 

If an organism’s diploid number is 12, its haploid number is
a.
12.
b.
6.
c.
24.
d.
3.
 

22. 

What principle states that during gamete formation genes for different traits separate without influencing each other’s inheritance?
a.
principle of dominance
b.
principle of independent assortment
c.
principle of probabilities
d.
principle of segregation
 

23. 

Offspring that result from crosses between true-breeding parents with different traits
a.
are true-breeding.
b.
make up the F2 generation.
c.
make up the parental generation.
d.
are called hybrids.
 

24. 

Situations in which one allele for a gene is not completely dominant over another allele for that gene are called
a.
multiple alleles.
b.
incomplete dominance.
c.
polygenic inheritance.
d.
multiple genes.
 

25. 

Gregor Mendel used pea plants to study
a.
flowering.
b.
gamete formation.
c.
the inheritance of traits.
d.
cross-pollination.
 



 
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