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Heredity (1 & 2 Trait Crosses)

Total questions: 20

Worksheet time: 25mins

Name
Class
Date
1.

Which of the following genotypes is homozygous dominant?

a)

Bb

b)

dd

c)

G

d)

RR

2.

Physical descriptions such as hair color, eye color, height are known as an organisms ___________.

a)

phenotype

b)

genotype

3.

The same gene can come in different versions, the different versions of a gene are called:

a)

Alleles

b)

Chromosomes

c)

Traits

4.

Which of the following would produce a recessive phenotype?

a)

hh

b)

Rr

c)

Ww

d)

BB

5.

If your genotype is Bb, then you can only pass a B or b separately to your child but you can't pass both. This is known as the ________.

a)

Law of Dominance

b)

Law of Segregation

c)

Law of Independent Assortment

6.

The ___________ states that a recessive allele is only expressed when a dominant allele is not present.

a)

Law of Dominance

b)

Law of Inheritance

7.

Different traits are inherited independently of each other

a)

Law of independent assortment

b)

Genetics law

8.

What is the phenotypic ratio for the monohybrid cross between blue and brown eyes?

a)

3:1

b)

2:2

c)

0:2:1

d)

1:2:1

9.

Based on the results in the monohybrid punnett square, what is the percent chance of having a child with blue eyes?

a)

75%

b)

50%

c)

25%

d)

0%

10.

Based on the results in the monohybrid punnett square, what is the genotypic ratio?

a)

1:2:1

b)

0:2:2

c)

0:0:4

d)

none

11.

What goes in box 1?

a)

AABb

b)

AABB

c)

aabb

d)

AaBB

12.

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%

13.

In cacti, long arms (A) are dominant to short arms (a). Suppose 2 heterozygous cacti are crossed. What percentage of their offspring are expected to have short arms?

a)

0%

b)

25%

c)

75%

d)

100%

14.

In watermelons, green rinds (G) are dominant to striped rinds (g). What is the genotype of a heterozygous green watermelon?

a)

GG

b)

Gg

c)

gg

d)

green

15.
The Father of Genetics: ______________
a)
Mendel
b)
Genetics
c)
Homozygous
d)
Genotype
e)
Phenotype
16.
The phenotype for box 2.
a)

Free earlobes, red hair

b)

attached earlobes, non-red hair

c)

Free earlobes, non-red hair

d)

Attacched earlobes, red hair

17.

In a dihybrid cross of complete dominance, what is the phenotypic ratio?

a)

1:2:1

b)

3:1

c)

9:3:3:1

d)

12:4

18.

In a population of 100 offspring, how many would you expect to be homozygous dominant in a cross between a homozygous dominant and a homozygous recessive parent?

a)

0

b)

25

c)

50

d)

75

e)

100

19.
What is the genotype ratio for crossing a heterozygous red flower with a white flower?
a)
0:2:2
b)
2:2:0
c)
1:2:1
d)
0:0:4
20.

Based on the results in the monohybrid punnett, what is the phenotypic ratio?

a)

3:1

b)

1:1

c)

2:2

d)

4:0