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Review #1 for End of Genetics Unit Assessment

Total questions: 48

Worksheet time: 36mins

Name
Class
Date
1.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
2.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
3.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
4.
What percentage of the offspring will have this recessive disease?
a)
0%
b)
25%
c)
50%
d)
75%
5.
What percentage of the female offspring will be a carrier for this recessive disease?
a)
0%
b)
50%
c)
100%
d)
25%
6.
I have 2 X chromosomes. What am I?
a)
Male
b)
Female
7.
I have 1 X chromosome and 1 Y chromosome. What am I?
a)
Male
b)
Female
8.
If a gene is found only on the X chromosome and not the Y chromosome, it is said to be what?
a)
sex-linked trait
b)
polygenic trait
c)
codominant trait
d)
incomplete dominance trait
9.
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
10.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
a)
XHXh
b)
XhXh
c)
XHY
d)
XhY
11.

H= normal blood clotting

h=hemophilia


XHXh x XHY


What is the probability that any of their offspring will have hemophilia?

a)

4/4

b)

3/4

c)

2/4

d)

1/4

12.

Look at this cross: XB XB x Xb Y

What proportion/percent of the male children are colorblind?

a)

100%

b)

75%

c)

25%

d)

0%

13.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R X r ?

a)

male with white eyes

b)

female with red eyes

c)

male with red eyes

d)

female with white eyes

14.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R Y ?

a)

male with white eyes

b)

female with white eyes

c)

male with red eyes

d)

female with red eyes

15.

In fruit flies, eye color is a sex linked trait. Red is dominant to white. What is the sex and eye color of flies with the following genotype: X R X R ?

a)

male with red eyes

b)

female with red eyes

c)

male with white eyes

d)

female with white eyes

16.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X r Y ?

a)

male with red eyes

b)

female with red eyes

c)

male with white eyes

d)

female with white eyes

17.
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
18.
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
19.
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
20.
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
21.

Males can be heterozygous for sex-linked traits.

a)

True

b)

False

22.

How many recessive genes does a carrier female have for colorblindness?

a)

1

b)

2

c)

0

23.

Muscular dystrophy is a sex-linked recessive disorder. A man with muscular dystrophy marries a woman who doesn’t have this disease. Half of their daughters and half of their sons develop this disease. What is the genotype of the mother?

a)

XNXN

b)

XNXn

c)

Xn

d)

XN

24.

Physical characteristics, or visible traits of an organism

a)

phenotype

b)

genotype

c)

trait

25.

Two identical alleles for the same trait.

a)

Heterozygous

b)

Homozygous

c)

Dominant

26.

Two different alleles for the same trait.

a)

Heterozygous

b)

Homonzygous

c)

Dominant

27.

A trait that overpowers the other trait.

a)

Hybrid

b)

Dominant

c)

Recessive

28.

The Alleles bb are

a)

Heterozygous

b)

Homozygous Dominant

c)

Homozygous Recessive

29.

The allelles BB are

a)

Heterozygous

b)

Homozygous Recessive

c)

Homozygous Dominant

30.

The Alleles Bb are

a)

Homozygous

b)

Heterozygous

c)

Homozygous Dominant

31.

The allele that is weaker and will not show if a dominant allele is present

a)

Dominant

b)

Recessive

c)

Traits

32.

Which of the following is a Phenotype?

a)

Bb

b)

Brown Eyes

33.

Which of the following is an example of Genotype?

a)

Tt

b)

Tall

34.

Which of the following Genotypes would be considered heterozygous

a)

BB

b)

gg

c)

Ff

d)

TT

35.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
b)
Tall = T
Short = t
c)
Tall = t
Short = T
d)
Tall = TT
Short = tt
36.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
37.
What is the probability of a purple-horned unicorn if a heterozygous pink-horned unicorn is crossed with a heterozygous pink-horned unicorn?
a)
0%
b)
25%
c)
50%
d)
75%
38.
Identify the homozygous dominant genotype:
a)
FF
b)
Ff
c)
ff
39.

Complex molecule that carries genetic information that defines an organism's traits. It is stored in the nucleus.

a)

Protein

b)

DNA

c)

RNA

d)

Glucose nucleic acid (GNA)

40.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
41.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
42.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
43.

B = brown eyes

b = blue eyes

One brother has genotype BB and the other brother has genotype Bb.

Which statement is true about these two brothers?

a)

They have same phenotype and genotype

b)

They have different phenotypes and genotypes

c)

They have same phenotype, but different genotypes

d)

They have different phenotypes, but the same genotype

44.

Which of the following would be a phenotype?

a)

Aa

b)

red hair

c)

heterozygous

d)

DNA

45.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
46.

Which of the following genotypes is homozygous dominant?

a)

Yy

b)

yY

c)

yy

d)

YY

47.

Which of the following genotypes is homozygous recessive?

a)

Tt

b)

tt

c)

TT

d)

tT

48.

In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any white-flowering plant resulting from this species?

a)

rr

b)

rR

c)

RR

d)

Rr

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