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Genetics Review

Total questions: 40

Worksheet time: 2hrs 41mins

Name
Class
Date
1.

How many alleles (letters) does a child get from each parent?

a)

1

b)

2

c)

3

d)

4

2.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
3.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
4.
AA and Aa always show up as
a)
dominant
b)
recessive
5.
aa always shows up as
a)
dominant
b)
recessive
6.
If B = brown hair and b = blonde hair, what is the probability of brown hair?
a)
25%
b)
50%
c)
0%
d)
75%
7.
In certain species of plants, purple flowers (P) are dominant to white flowers (p). If two heterozygous plants are crossed, what will be the phenotype of the offspring?
a)
100% purple flowers
b)
100% white flowers
c)
75% white flowers, 25% purple flowers
d)
25% white flowers, 75% purple flowers
8.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
9.
What do we use pedigrees for?
a)
To look at families
b)
To make determinations about the offspring
c)
To track traits in families
d)
Nothing
10.
In a pedigree, what shape represents a male?
a)
circle
b)
square
c)
triangle
d)
diamond
11.
What does an open circle represent?
a)
Not Affected Male
b)
Not Affected Female
c)
Affected Male
d)
Affected Female
12.
What does a filled in square represent?
a)
Not affected Female
b)
Not affected Male
c)
Affected Male
d)
Affected Female
13.
What do half colored symbols represent?
a)
The individual is a carrier (heterozygous).
b)
The individual expresses the trait.
c)
The individual has both recessive alleles.
d)
The individual has both dominant alleles.
14.
How many individuals are there in the 3rd generation?
a)
2
b)
3
c)
4
d)
6
15.
How are individuals III-2 and II-4 related?
a)
Cousins
b)
Dad and Daughter
c)
Uncle and Niece
d)
Grandpa and Granddaughter
16.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
17.
This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?
a)
8
b)
5
c)
2
d)
3
18.

If this pedigree shows a recessive disorder, what MUST the genotype of individual 4 be?

a)

HH

b)

Hh

c)

hh

19.

In snapdragons, flower color is an incompletely dominant trait. Which genotype will lead to a third blended phenotype?

a)

Homozygous dominant

b)

Heterozygous

c)

Homozygous recessive

20.

Red is incompletely dominant to white in snapdragons. Which cross would result in 100% pink flowers?

a)

RR x rr

b)

rr x rr

c)

Rr x Rr

d)

RR x RR

21.

In humans, curly hair is dominant to straight hair, and wavy hair is an intermediate texture. Which explanation most likely accounts for wavy hair?

a)

a mutation occurred, producing wavy hair

b)

a different set of genes resulted in wavy hair

c)

inheritance occurred through incomplete dominance

d)

inheritance occurred as a result of a gene from only one parent

22.

In chickens, black is co dominant with white feathers. Which cross would result in 50% black and white feathers?

a)

BW x BW

b)

BB x WW

c)

BW x WW

d)

WW x BB

23.

In a certain breed of cattle, both red and white hairs show up together. This is an example of which type of inheritance pattern?

a)

incomplete dominance

b)

codominance

c)

multiple alleles

d)

polygenic inheritance

24.

What is name for traits that are controlled by many genes such as height and skin color?

a)

complete dominance

b)

incomplete dominance

c)

co dominance

d)

polygenic

e)

multiple alleles

25.

A child has blood type AB. Which blood types would his parents most likely have?

a)

B and O

b)

O and A

c)

A and B

d)

AB and O

26.

Which could NOT result from a cross between IAIB and IAi?

a)

Type A Blood

b)

Type B Blood

c)

Type AB Blood

d)

Type O Blood

27.

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

a)

Incomplete Dominance

b)

Co Dominance

c)

Sex-Linked

d)

Polygenic

28.

A red flowered plant (RR) breeds 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%

29.
A roan cow shows co-dominance in fur color (orange and white). What is the phenotype ratio expected if a roan cow and a roan steer mate together?
a)
4: Orange and White
b)
1: Orange : 1 White
c)
2 Orange: 2 Orange and White: 0 White
d)
1: Orange: 2 Orange and White: 1 White
30.

This type of inheritance pattern is a Blend of both traits.

a)

incomplete dominance

b)

co-dominance

c)

complete dominance

d)

recessive pattern

31.
This type of inheritance pattern shows BOTH traits in possible offspring
a)
complete dominance
b)
incomplete dominance
c)
co-dominance
d)
dominant pattern
32.
How many PAIRS of chromosomes do humans have?
a)
23
b)
46
c)
1
d)
2
33.
How many PAIRS of sex chromosomes do humans have?
a)
23
b)
46
c)
1
d)
2
34.

this image is an example of

a)

codominance

b)

dominance

c)

incomplete dominance

d)

sex-linked inheritance

35.

This is an example of ___________?

a)

Incomplete dominance

b)

Co-Dominance

c)

Sex-linked inheritance

d)

Autosomal recessive inheritance

36.
Looking at this pedigree, how many family members have the disease?
a)
4
b)
7
c)
All
d)
None
37.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXB
b)
XbXb
c)
XbY
d)
XBY
38.
Hemophilia is a recessive x-linked disorder. According to the Punnett square, what percentage of offspring will have the disorder?
a)
0%
b)
25%
c)
50%
d)
100%
39.

If two parents have type AB blood, what is the probability that their child will have type O blood?

a)

0%

b)

25%

c)

50%

d)

100%

40.

The genotypes of the couple in the 3rd generation

a)

must be AA x AA

b)

must be Aa x Aa

c)

must be Aa x aa

d)

must be aa x aa

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