Modern Genetics Review

bewilderedvoyageBiotechnology

Dec 12, 2012 (4 years and 4 months ago)

263 views

____________________________
____________________________
____
Modern Genetics
Review___
_

____________________________
_

Modern Genetics

Review


Multiple Choice

Identify the choice that best completes the statement or answers the question.


_
___

1.

Which
of these traits is controlled by a gene with multiple alleles?

a.

straight hairline

b.

smile dimples

c.

widow’s peak



扬潯搠ty灥




____

2
.

Why does height in humans have such a wide variety of phenotypes?

a.

Height is controlled by at least four
genes.

b.

The gene for height has only two alleles.

c.

Height is controlled by sex
-
linked genes.

d.

Height is controlled by a recessive allele.


____

3
.

What controls variations in skin color among humans?

a.

a person’s diet



m慮y⁧敮es



m畬ti灬e

慬lel敳 潦⁡⁳ 湧l攠g敮e



tw漠慬lel敳 潦 愠ai湧l攠e敮e



____

4
.

Which of these human traits is altered by variations in environment?

a.

hairline

b.

height

c.

smile dimples

d.

blood type



____

5
.

What is a pedigree?

a.

a chart that tracks which
members of a family have a particular trait

b.

a geneticist who studies the inheritance of traits in humans

c.

a picture of all of the chromosomes in a cell

d.

an allele passed from parent to child on a sex chromosome



____

6
.

What would be the best
way to predict the probability of a baby having cystic fibrosis?

a.

by studying the parents’ karyotypes



by studying the family’s pedigree chart



批⁥硰 潲i湧敷整桯摳h潦⁧敮eti挠c湧i湥nri湧



批⁤整敲mi湩湧⁷桥hh敲 t桥⁰慲e湴猠桡h攠e潤潭i湡nt

alleles



____

7
.

What is the purpose of the Human Genome Project?

a.

to identify the DNA sequence of every gene in the human genome

b.

to clone every gene on a single chromosome in human DNA

c.

to cure genetic diseases

d.

to inbreed the best genes on

every chromosome in human DNA



____

8
.

Both parents of a child have type A blood. What might their child’s blood type be?

a.

Type A only

b.

Type A or type B

c.

Type A or type O

d.

Type A or type AB



____

9
.

Sex
-
linked genes are genes on

a.

the

X chromosome only.

b.

the Y chromosome only.

c.

the X and Y chromosomes.

d.

all 23 pairs of chromosomes.





____

10
.

Which form of selective breeding crosses parents with the same or similar sets of alleles?

a.

fertilization

b.

inbreeding

c.

hybridization

d.

cloning



____

11
.

Hemophilia is caused by a(n)

a.

recessive allele on the X chromosome.

b.

extra chromosome.

c.

dominant allele.

d.

codominant allele.




____

12
.

Many characteristics are affected by interactions between genes and

a.

chromosomes.

b.

the environment.

c.

alleles.

d.

carriers.



____

13
.

Adults with Down syndrome can often find work because they have received

a.

folic acid.

b.

physical therapy.

c.

education and job training.

d.

genetic counseling.



















1
4
.

What do the squares represent

on the pedigree
?

_______________________________________________________


_____________________________________________________________________________________________

15
.

Which pairs of individuals in the
pedigree have children?

_______________________________________________

16
.

Which individuals neither have the trait nor are carriers?

________________________________________________

17.

Could the trait that is traced by this pedigree be sex
-
linked? Explain

why or why not.

_________________________

______________________________________________________________________________________________

______________________________________________________________________________________________
________________________
______________________________________________________________________
______________________________________________________________________________________________
____________________________________________________________________________________________
__



Completion

Complete each statement.


18.

Except for
______________________________
, all people have
different

DNA.

19.

The three alleles on the single gene that controls blood type are said to be ____________________
_______
.

20.

When many genes control a trait,
the trait will show a large number of _________
__________
___________.

21.

A carrier is a person who has one ______
________________
______________ allele for a trait.

22.

A(n) _____
_______________
_______________ is used to track the occurrence of a trait in a family
.

23.

People who have the genetic disorder called _____________
________________
_______ suffer from abnormally low
levels of oxygen in the blood.

24.

A person who has the genetic disorder called ___________
_______________________ bleeds easily.

25.

____________________________________________
is caused by the presence of an extra
chromosome
.

26.

Breeders use a technique called ________
_______
____________ to cross genetically different individuals.

27.

A gene from one organism is inserted into the DNA of anot
her organism in the process known as
____________
__________________________
_____________.

28.

Scientists in the Human Genome Project are working to identify the ____________________
___________

of every
human gene.

29.

All of the DNA in one cell of an organism is c
alled a(n)
___________________
____________________.

30.

A selective breeding technique called _____
_________________
_______________ has been used to breed purebred
racehorses.

31.

A pattern produced from fragments of the DNA of a specific person is called a(n)
___
______
________________________
___________.

32.

A karyotype can be used to determine the number of _________
_________
___________ in a person’s cells.

Create a Pedigree

Draw a pedigree using the following information. Be sure to create an appropriate key.


33.

Jane and Joe are the first generation in the pedigree. Jane is a carrier of sickle
-
cell disease. They have two boys,
Scott and Ryan. Ryan is not a carrier and does
not
have any offspring. Scott is a carrier of sickle
-
cell disease and
marries Heather wh
o is also a carrier. They have four children. Sara and Jim are carriers of sickle
-
cell disease and
Megan and George have sickle
-
cell disease. (Be sure to label the pedigree.)
















Essay

Fully answer all of the following questions with detailed explanation. Minimum
of four well developed complete
sentences
.


34.

Human eyes come in a variety of colors ranging from light blue to very dark brown. Explain why eye color is not
likely to be contro
lled by a single gene.
______________________________________________________________________________________________
______________________________________________________________________________________________
_____________________________________________
_________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
__________________________________________________________
__________
_______________
___________

35.

Explain what causes cystic fibrosis and describe its effects on the body.

What are some treatments for those with the
disease?

______________________________________________________________________________________________
_______
_
______________________________________________________________________________________
______________________________________________________________________________________________
_________
__________________________________________________________________
___________________
______________________________________________________________________________________________
___________
________________________
___________________________________________________________

36.

A plant breeder clones a plant with beautiful fl
owers. Define cloning and explain how the cloned offspring compare
to the parent plant.

______________________________________________________________________________________________
___________________
_______________________________________________________
____________________
______________________________________________________________________________________________
___________________
___________________________________________________________________________
________________________________________________
______________________________________________
_______________________________
________________________
_______________________________________

37.

Contrast hybridization and inbreeding.

____________________________________________________________________________
__________________
______________________________________________________________________________________________
__________________
____________________________________________________________________________
__________________________________________________
____________________________________________
__________________
____________________________________________________________________________
_______
_______________________________________________________________________________________