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Unit 7 Quiz 2 Dihybrid Cross (InClass)

Total questions: 25

Worksheet time: 39mins

Name
Class
Date
1.

Mendel proposed that traits observed in pea plants resulted from a combination of "factors" inherited from each parent. His description of these "factors" can be considered the first scientific definition of the role of —

a)

ribosomes

b)

meiosis

c)

genes

d)

cell nuclei

2.

Mendel's early work with pea plants demonstrated a significant genetic discovery. The crossing of homozygous tall pea plants with homozygous short pea plants always resulted in tall plants and demonstrated that tallness in pea plants is a trait that is —

a)

blended

b)

dominant

c)

mutated

d)

recessive

3.

The following items are examples of __________.

Items: eye color, hair color, height

a)

homozygous alleles

b)

genotype

c)

heterozygous alleles

d)

phenotype

4.

What is the term for a cross that involves just one trait, such as pod shape?

a)

test cross

b)

dihybrid cross

c)

monohybrid cross

d)

homozygous cross

5.

When the heterozygous condition results in traits that are blended or intermediate (not dominant or recessive), it is _______.

a)

codominance

b)

dominance

c)

Mendelian

d)

incomplete dominance

6.
What goes in box 1
a)
AABb
b)
AABB
c)
aabb
d)
AaBb
7.

What is the term for when an organism has two different alleles at a particular locus?

a)

purebred

b)

dominant

c)

recessive

d)

heterozygous

8.

What goes in box 15

a)

aabb

b)

AABB

c)

aaBB

d)

AAbb

9.

Select the following option(s) that is/are considered to be homozygous.

a)

BB

b)

Bb

c)

bb

10.

Select the following option(s) that is/are considered to be heterozygous.

a)

BB

b)

Bb

c)

bb

11.
In guinea pigs, the allele for short hair is dominant over the allele for long hair.
B = short 
b = long
What would the cross be for two heterozygous guinea pigs?
a)
BB X BB
b)
BB X Bb
c)
Bb X Bb
d)
bb X bb
12.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
13.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
14.
An organism’s genetic makeup, or allele combinations
a)
Recessive
b)
Genotype
c)
Phenotype
d)
Heterozygous
15.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
16.
In a ____________ cross, one pair of contrasting traits are being crossed.
a)
monohybrid
b)
dihybrid
c)
trihybrid
d)
quadhybrid
17.
In a dihybrid cross, _________ pairs of contrasting traits are being crossed.
a)
one 
b)
two
c)
three
d)
four
18.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
19.
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%
20.
Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r  = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds? 
a)
0%
b)
25%
c)
50%
d)
100%
21.
What is the genotype for a pea plant heterozygous for round seeds (R), and homozygous recessive for green seeds (y)?
a)
Ry
b)
RRyy
c)
RrYy
d)
Rryy
22.
In guinea pigs, black hair is dominant to white hair and short hair is dominant to long hair. What would be the phenotype of a guinea pig with the genotype Bbss?
a)
Black hair, long hair
b)
Black hair, short hair
c)
White hair, long hair
d)
White hair, short hair
23.
Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?
a)

9/16

b)

2/16

c)

3/16

d)

6/16

24.

Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?

a)

9/16

b)

3/16

c)

1/16

d)

16/16

25.

Based off this punnett square, what fraction of the offspring will have wrinkled, green seeds?

a)

9/16

b)

3/16

c)

1/16

d)

16/16

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