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Basic Genetics

Total questions: 57

Worksheet time: 50mins

Name
Class
Date
1.

Which of the following terms is an option of a trait?

a)

Gene

b)

Allele

c)

Zygote

d)

Gamete

2.

Which of the following is a section of DNA?

a)

Allele

b)

Gene

c)

Trait

d)

Chromosome

3.

The diploid number in humans is ...

a)

23

b)

46

c)

62

d)

108

4.

Organisms with higher numbers of chromosomes are more complex than organisms with lower numbers of chromosomes.

a)

True

b)

False

5.

Which of the following is NOT found in DNA?

a)

Adenine

b)

Deoxyribose

c)

Uracil

d)

Ribose

6.

Traits that cannot be expressed unless with its match are...

a)

Dominant

b)

Recessive

7.

Which of the following traits are homozygous?

a)

Gg

b)

GG

c)

gg

8.

Which of the following traits are heterozygous?

a)

Gg

b)

GG

c)

gg

9.

Which of the following combinations produces a male?

a)

XX

b)

XY

c)

YY

10.

Which sex chromosome combination is not possible?

a)

XX

b)

XY

c)

YY

11.

Look at the following alleles:

R = red eyes

r = white eyes


If this gene works on the principle of complete dominance, what would the eye color be if the genotype is Rr?

a)

Red eyes

b)

White eyes

c)

Pink eyes

12.

Look at the following alleles:

R = Red scales

r = yellow scales


If this gene works on the principle of incomplete dominance, what would the scale color be if the genotype is Rr?

a)

Red scales

b)

Yellow scales

c)

Orange scales

13.

A plant that always produces offspring identical to itself is...

a)

Homozygous

b)

True breeding

c)

Dominant

14.

If true breeding dominant plants are bred with true breeding recessive plants, what would the offspring look like?

a)

The would look like a mixture of both plants.

b)

They would look like the dominant plant.

c)

They would look like the recessive trait.

15.

What would the genotype of the question marked square be?

a)

GG

b)

Gg

c)

gg

16.

In a cross between Rr and rr, how many of the offspring would be Rr?

a)

1

b)

2

c)

3

d)

4

17.

In a cross between Rr and Rr, how many of the offspring would be rr?

a)

1

b)

2

c)

3

d)

4

18.
George Guinea Pig met Greta Guinea Pig at a picnic.  George is heterozygous for his long hair, but Greta has short hair.  What are the chances of having a baby guinea pig with short hair?
a)
100%
b)
75%
c)
50%
d)
25%
19.
George Guinea Pig met Greta Guinea Pig at a party.  George is heterozygous for his long hair, but Greta has short hair.  How can we describe Greta's genotype?
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
20.
Stuart Snail is heterozygous for tall eyeballs.  Sally Snail has tall eyeballs but does carry the recessive allele.  What are the chances that their baby snail would have short eyeballs?
a)
75%
b)
50%
c)
25%
d)
0%
21.
Stuart Snail is heterozygous for tall eyeballs.  Sally Snail has tall eyeballs but does carry the recessive allele.  If their baby snail has tall eyeballs then what is/are the possible genotype(s) he could have?
a)
TT
b)
TT , Tt
c)
TT, Tt, tt
d)
tt
22.
Gary Goldfish is heterozygous for dark orange color.  Ginny Goldfish is homozygous dominant.  Their baby has light orange color.  Is Gary the father?
a)
Yes, because the light orange color is dominant
b)
No, because there is no way they could produce a homozygous recessive baby
c)
Yes, because Ginny has two alleles for light orange color, so their baby could be light orange
d)
No, because Gary does not have the allele for light color.
23.
 Gary Goldfish is heterozygous for dark orange color.  Ginny Goldfish is homozygous dominant.  What is the chance that they will have a heterozygous offspring?
a)
100%
b)
75%
c)
50%
d)
25%
24.
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
25.
What are the possible genotypes for this cross?
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
26.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
27.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
d)
recessive pattern
28.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
29.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
30.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
31.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
32.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
33.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
34.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
35.
B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
36.
AA and Aa always show up as
a)
dominant
b)
recessive
37.
aa always shows up as
a)
dominant
b)
recessive
38.
Aa is
a)
homozygous
b)
heterozygous
39.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
40.
What ratio of the offspring from the cross shown will be homozygous recessive for the  trait of tallness? 
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
41.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
42.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
43.
Which of the characteristics is a lion least likely to pass on to its offspring?
a)
fur color
b)
length of tail
c)
scars on leg
d)
body size
44.
What gender has an X and a Y chromosome?
a)
male
b)
female
c)
transgender 
d)
all of the above
45.

What are the possible phenotype(s) of the offspring? (A-Brown hair; a-blond hair)

a)

50 % Brown Hair and 50% Blond Hair

b)

25 % Brown Hair and 75% Blond Hair

c)

75 % Brown Hair and 25% Blond Hair

d)

0% Brown Hair and 100% Blond Hair

46.

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%

47.
What is the yellow seed genotype?
a)
aa
b)
Aa
c)
AA
d)
AA or Aa
48.
What genotype would go in box 2?
a)
BB
b)
Bb
c)
bb
49.

What is the probability of heterozygous offspring?

a)

0%

b)

100%

c)

50%

d)

25%

50.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
51.

What are the possible genotypes for this cross?

a)

TT = 25% Tt= 50% tt=25%

b)

all tall

c)

TT= 75% tt = 25%

d)

Tt = 100%

52.

What genotype would go in box 4?

a)

BB

b)

Bb

c)

bb

53.

What genotype would go in box 1?

a)

BB

b)

Bb

c)

bb

54.

What is the possibility of this offspring having the dominant trait?

a)

50%

b)

75%

c)

25%

d)

0%

55.
What is the missing allele?
a)
a
b)
A
c)
AA
d)
aa
56.
W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
a)
none
b)
3/4
c)
1/2
d)
all
57.
Which of the following best describes a DNA molecule?
a)
double helix
b)
contains ribose
c)
made of amino acids
d)
contains uracil

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