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Genetics Review

Total questions: 51

Worksheet time: 40mins

Name
Class
Date
1.

The passing of traits from parent to child is known as _______________.

a)

heredity

b)

gene

c)

DNA

d)

RNA

2.

This trait is represented by a lower case letter and hidden whenever the dominant allele is present

a)

dominant allele

b)

codominance

c)

recessive allele

d)

Punnett Square

3.

This trait is represented by a capital letter and always shows up in an organism when the allele is present

a)

dominant allele

b)

codominance

c)

probability

d)

recessive allele

4.

Which of the following is homozygous recessive?

a)

RR

b)

Rr

c)

rR

d)

rr

5.

Which genotypes are heterozygous?

a)

EE

b)

tt

c)

Rr

d)

Both EE and tt

6.

Which genotypes are homozygous dominant?

a)

EE

b)

tt

c)

Rr

d)

Both EE and tt

7.

Which genotypes are homozygous?

a)

EE

b)

tt

c)

Rr

d)

Both EE and tt

8.

_____ is the genetic makeup of an organism.

a)

phenotype

b)

genotype

9.

A ____ is a region of DNA that controls a trait.

a)

gene

b)

phenotype

c)

chromatin

d)

genotype

10.

The ____ is the physical appearance of an organism.

a)

genotype

b)

phenotype

11.
Genotype refers to the ...
a)
physical expression of the genes
b)
the possible combination of alleles in a gene
c)
whether an allele is dominant or recessive
d)
how an organism will appear
12.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
13.
having two different genes for a trait (sometimes called hybrid).
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
14.
G = green, g = yellow
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
15.
Where, in the eukaryotic cell, is DNA located?
a)
ribosomes
b)
nucleus
c)
E.R.
d)
cytoplasm
16.
Sex cells are produced through the process of
a)
mitosis
b)
cytokinesis
c)
binary fission
d)
meiosis
17.
What does heterozygous mean?
a)
An organism that has the same genes for a trait (TT or tt)
b)
An organism that has different genes for a trait (Tt)
c)
When neither gene is fully dominant; offspring is a mixture of both
d)
the different forms of a trait (hair color--> brown, blonde, red
18.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
19.
Complex molecule that carries genetic information that defines an organism's traits. It is stored in the nucleus.
a)
DNA
b)
protein
c)
RNA
d)
glucose nucleic acid (GNA)
20.
rule where genes come in only dominant or recessive
a)
Regulatory Genes
b)
Mendelian Inheritance
c)
Incomplete Dominance
21.
shows even if only one parent passes on the gene
a)
recessive
b)
regulatory gene
c)
dominant
22.

"T" is dominant, "t" is recessive. If an organism has the genes "Tt."

Which will trait will result?

a)

"T" dominant

b)

"t" recessive

23.

"G" is dominant, "g" is recessive. If an organism has the genes "gg."

Which will trait will result?

a)

"G" dominant

b)

"g" recessive

24.

Emily has brown hair.

Which most likely explains why Emily has brown hair?

a)

Emily’s favorite color is brown.

b)

Emily has a parent with brown hair.

c)

Emily’s older brother has brown hair.

25.

What should you use to predict the traits of offspring when you know the genes of two parents?

a)

a graph

b)

a flow chart

c)

a data table

d)

a Punnett square

26.

Which statement best supports why many offspring look similar to their parents?

a)

Offspring inherit traits from only one parent.

b)

Offspring inherit traits from both parents.

c)

Parents choose which traits to pass on to their offspring.

27.

What is the probability of bb offspring?

a)

1/4

b)

2/4

c)

0/4

d)

4/4

28.

What allele combination should go in the missing box?

a)

AA

b)

Aa

c)

aa

d)

none of these

29.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being purple?
a)
25%
b)
0%
c)
100%
d)
50%
30.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being white?
a)
25%
b)
0%
c)
100%
d)
50%
31.
Is it possible for a visible trait to skip a generation? Example: Blue eyes
a)
Yes
b)
No
32.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
33.
B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
34.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
35.
In the punnett square shown, what is the genotypes of the two parents?
a)
RW and RR
b)
RW and WW
c)
RR and WW
d)
RW and RR
36.
Which of the following is a phenotype?
a)
Aa
b)
black hair
c)
heterozygous genes
d)
mutated DNA
37.
This image shows a...
a)
Punnett Square
b)
Phenotype
c)
Genotype
d)
Dominant allele
38.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
39.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
40.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
41.
Which of the following genotypes are purebred?
a)
Pf
b)
Pp
c)
PP
d)
pP
42.
Which of these is homozygous recessive?
a)
Rr
b)
rR
c)
RR
d)
rr
43.
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
44.
An individual's sex is determined by 
a)
1 of 23 chromosomes
b)
2 of 46 chromosomes
c)
4 of 92 chromosomes
45.
Why is the gene for a disease or disorder more likely to be found on the X chromosome than Y?
a)
The X chromosome has many more genes
b)
The Y chromosome has many more genes
46.
Males are more likely to suffer from a sex-linked disease or disorder because
a)
males are the weaker sex
b)
males have less DNA
c)
males have 1 X chromosome, so the disorder is more likely to be expressed
47.
When we say that a woman is a carrier for a genetic disease or disorder it means that
a)
she has 1 gene, but not the disorder
b)
she has 2 genes for the disorder
c)
she can pass the gene only to male children
d)
she can pass the gene only to female children
48.
Why are men 16 times more likely to be color-blind than women?
a)
to be color-blind, you must have a Y chromosome
b)
to be color-blind, all of your X chromosomes must have the gene
c)
color-blindness is caused by testosterone
d)
color-blindness is caused by the same gene as baldness
49.
If a gene is found only on the X chromosome and not the Y chromosome, it is said to be 
a)
sex-linked trait
b)
polygenic trait
c)
codominant trait
d)
incomplete dominance trait
50.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?
a)
XHXh
b)
XhXh
c)
XHXH
d)
XhY
51.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
a)
XHXh
b)
XhXh
c)
XHY
d)
XhY

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