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Genetics Review 2

Total questions: 52

Worksheet time: 1hrs 9mins

Name
Class
Date
1.

Which genotypes would be considered homozygous? (select all correct answers)

a)

TT

b)

yy

c)

Bb

d)

IAi

e)

IBIB

2.

A gene is a segment of ___________ that codes for a trait.

a)

RNA

b)

amino acids

c)

DNA

d)

alleles

3.

In guinea pigs, B=black fur and b=brown fur


If a black Guinea pig is crossed with

a brown Guinea pig and the litter

contains a brown baby, the genotype

of the black parent is probably

a)

Bb

b)

bb

c)

BB

4.

What is a chromosome?

a)

Tightly coiled DNA

b)

A small section of DNA

c)

A long chain of amino acids

d)

A short chain of amino acids

5.

What is a gene?

a)

A small section of DNA

b)

One chromosome that codes for a trait

c)

A protein that builds DNA

d)

All of these

6.

Each box in a punnett square represents a __________% chance that an offspring will inherit that genotype.

a)

10

b)

100

c)

50

d)

25

7.

If Y is the allele for yellow, what are the odds that the offspring will be yellow?

a)

50%

b)

25%

c)

100%

d)

75%

8.

A genotype is the...

a)

physical trait an organism has

b)

the set of letters that represents the genes of an organism

9.

Select the homozygous dominant genotype.

a)

AA

b)

Aa

c)

aa

d)

All of these

10.

Select ALL homozygous genotypes.

a)

AA

b)

Aa

c)

aa

d)

Bb

11.
What is the dominant phenotype? 
a)
BB
b)
Purple
c)
White
d)
Purple and White
12.
What percentage of the offspring are heterozygous (hybrid)?
a)
25%
b)
50%
c)
75%
d)
100%
13.
Select the appropriate genotype.
a)
green
b)
aa
14.
What percentage of offspring are purebred?
a)
100%
b)
75%
c)
50%
d)
25%
15.
These steps are called?
a)
base-pairs
b)
chromosome
c)
DNA
d)
Gene
16.
This structure X like is called a.....?
a)
Gene
b)
DNA
c)
Chromosome
d)
Nucleus
17.
The control center of a cell is called... (holds DNA)
a)
DNA
b)
Nucleus
c)
Gene
d)
Chromosome
18.
The Father of Genetics is?
a)
Watson
b)
Mendel
c)
Galileo
d)
Einstein
19.
How many chromosomes do humans have?
a)
45
b)
46
c)
23
d)
47
20.
What's the probability of being purebred recessive?
a)
75%
b)
25%
c)
100%
d)
50%
21.
A change in the DNA is called a.....?
a)
correction
b)
mutation
c)
change
22.
Mutations can be.....?
a)
Good
b)
Bad
c)
Good or bad
d)
Good, Bad or Neither
23.
The study of genes is called.....
a)
life science
b)
biology
c)
genetics
d)
heredity
24.
The passing of traits to offspring is called....
a)
heredity
b)
genetics
c)
biology
d)
life science
25.

The different forms of a gene are called ---

a)

traits

b)

hybrids

c)

alleles

26.

The blending of two traits is known as ---

a)

incomplete dominance

b)

codominance

27.

This type of inheritance pattern is a MIXTURE of two traits. This is known as ---

a)

incomplete dominance.

b)

codominance

28.

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

a)

Incomplete dominance

b)

Codominance

29.

If you cross a black chicken with a white chicken, only black and white checkered chickens would be produced. What kind of inheritance pattern does this follow?

a)

Incomplete dominance

b)

Codominance

30.

This is an example of ---

a)

Incomplete dominance

b)

Codominance

31.

This is an example of ---

a)

Incomplete dominance

b)

Codominance

32.

A red flowered plant (RR) is crossed with a white flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have pink (RW) flowers?

a)

0%

b)

25%

c)

50%

d)

100%

33.

A tall plant (TT) is crossed with a short plant (SS). The result is a medium plant (TS). This is what type of inheritance pattern?

a)

Incomplete dominance

b)

Codominance

34.

The hair form gene shows incomplete dominance. Straight hair (SS) is dominant, curly hair (CC) is recessive, and wavy hair (SC) is heterozygous. Mr. and Mrs. Anderson both have wavy hair (SC). What percentage of their children will also have wavy hair (SC)?

a)

25%

b)

50%

c)

75%

d)

100%

35.

What does this Punnett square and the probabilities of the ofspring represent?

a)

incomplete dominance

b)

codominance

36.

Codominance occurs in calico cats, which allows for the Black and Tan colors to show. What percentage of the offspring will be calico (black and tan spotted)?

a)

25

b)

50

c)

75

d)

100

37.

Incomplete dominance occurs in cats, which allows them to be Black, White, or gray as shown on this Punnett square. What percentage of the offspring will be black?

a)

25

b)

50

c)

75

d)

100

38.
This is an example of ___________.
a)
 Incomplete Dominance
b)
 Codominance
39.
In Andalusian fowls, black individuals (BB) and white individuals (bb) are homozygous. Heterozygous individuals are grey (Bb).  
Cross a black fowl with a white fowl. What is the phenotype ratio?
a)
4 black: 0 grey: 0 white
b)
2 black: 2 grey: 0 white
c)
0 black: 4 grey: 0 white
d)
0 black: 2 grey: 2 white
40.
The sex of a child is determined by
a)
whether the father's sperm contains an x or y chromosome
b)
whether the mother's egg contains an x or y chromosome
c)
the age of the parents
41.
Any change in the sequence of DNA is...
a)
transgenic shift
b)
Single Genotype
c)
Monohybrid Trait
d)
Mutation
42.
Are all mutations bad?
a)
Yes
b)
No
43.
What pairs with Adenine (A)? 
a)
Guanine (G)
b)
Cytosine (C)
c)
Adenine (A)
d)
Thymine (T)
44.
What pairs with Thymine (T)?
a)
Adenine (A)
b)
Thymine (T)
c)
Guanine (G)
d)
Cytosine (C) 
45.
What pairs with Guanine (G)?
a)
Adenine (A)
b)
Thymine (T)
c)
Cytosine (C)
d)
Guanine (G)
46.
What pairs with Cytosine (C)?
a)
Guanine (G)
b)
Cytosine (C)
c)
Adenine (A)
d)
Thymine
47.
What are the three types of mutation? 
a)
Insertion, Deletion, Subsitution
b)
Deletion, Newstion, Subsitution 
c)
Newstion, Deletion, Insertion 
d)
Insertion, Newstion, Substitution 
48.
Which of the following best describes a DNA molecule?
a)
double helix
b)
contains ribose
c)
made of amino acids
d)
contains Uracil
49.
Why is DNA important?
a)
it is very small and very complicated
b)
it's in everything
c)
it serves as the blueprint for traits of all living things
d)
because we eat it every day for energy
50.
What do hurtful mutations do? 
a)
Decrease chances of survival 
b)
Increases changes of survival 
c)
Decreases likelihood of developing cancer
d)
Increases likelihood of developing cancer
51.
What do helpful mutations do? 
a)
Increases chances of survival 
b)
Decreases changes of survival 
c)
Increases chances of developing cancer
d)
Decreases skills
52.
Which of the following is an example of a hurtful mutation? 
a)
Developing cancer
b)
Makes the organism faster
c)
Makes the organism a predator 
d)
Develops sharp claws

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