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Grade 9 - Human Genetics

Total questions: 51

Worksheet time: 51mins

Name
Class
Date
1.

The diagram below represents the karyotype of a person with a genetic disorder.

Which is the likely cause of this condition? (3.2.2)

a)

nondisjunction during mitosis

b)

nondisjunction during meiosis

c)

chromosomal deletion during mitosis

d)

chromosomal deletion during meiosis

2.

Chromosomal disorder where a male has an extra X chromosome(3.2.2)

a)

Down syndrome

b)

Turners

c)

Jacobs

d)

Klinefelter's

3.

What is the name of the human chromosomal disorder that results in an extra chromosome #21? (3.2.1)

a)

Down syndrome

b)

Turners

c)

Jacobs

d)

Klinefelter's

4.

Achondroplasia is a dominant human disorder that results in dwarfism. If two people that are heterozygous for achondroplasia have a child, what is the probability it will be tall? (3.2.1)

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

5.

What genetic disorder results in 45 chromosomes in each of the body cells? (3.2.2)

a)

Turner's syndrome

b)

Down syndrome

c)

Klinefelter's

d)

Jacobs syndrome

6.
Which best explains why children resemble their parents?
a)
they eat same foods
b)
they have similar DNA
c)
they speak the same language
d)
they have the same interests
7.

Which term describes the different forms of a gene

a)

Chromosome

b)

Allele

c)

DNA

d)

Punnett Squares

8.

Aa, DD, Bb, yy are all examples of _______

a)

genotypes

b)

phenotypes

9.

Which statement is true?

a)

Your DNA is identical to your siblings.

b)

Your DNA is identical to your father's.

c)

Your DNA is identical to your mother's.

d)

Your DNA is unique to you.

10.
the passing of genetic traits from parent to offspring.
a)
heredity
b)
trait
c)
gene
d)
allele
11.
G = green, g = yellow
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
12.
Genotype refers to the ...
a)
physical expression of the genes
b)
the possible combination of alleles in a gene
c)
whether an allele is dominant or recessive
d)
how an organism will appear
13.
If "T" is the allele for tall and "t" is the allele for short, then Tt would produce?
a)
tall
b)
short
c)
medium
d)
not enough info
14.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
15.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
16.

What is the probability that the offspring will express the dominant trait?

a)

25%

b)

50%

c)

75%

d)

100%

17.
A child is diagnosed with a rare disease. Neither parent has the disease. How did the child inherit the disorder?
a)
The disorder is dominant and carried by a parent.
b)
The disorder is recessive and carried by both parents.
c)
The disorder is sex-linked and inherited only from the father.
d)
A mutation in the child occurred.
18.

95% of the cells life cycle

Stage where DNA is copied

a)

Interphase

b)

Metaphase

c)

Telophase

d)

Prophase

19.

Nuclear membrane disappears

Chromosomes can now be seen

Centrioles move to opposite sides

a)

Metaphase

b)

Interphase

c)

Telophase

d)

Prophase

20.

Chromosomes line up at the equator of the cell

Spindle fibers extend from the centrioles to the middle of the chromosomes

a)

Prophase

b)

Metaphase

c)

Anaphase

d)

Interphase

21.

Chromatids separate

a)

Anaphase

b)

Metaphase

c)

Prophase

d)

Telophase

22.

Nuclear membrane reforms around the new daughter cells.

Cytoplasm begins to "pinch" in.

a)

Anaphase

b)

Metaphase

c)

Telophase

d)

Interphase

23.

Two replicated cells split from each other and are able to move on their own.

a)

Metaphase

b)

Prophase

c)

Cytokinesis

d)

Telophase

24.

The goal of mitosis is to

a)

make a new parent cell

b)

make two new daughter cells with the same DNA

c)

make two new daughter cells with different DNA

d)

to grow a larger toe

25.

In interphase, the cell is

a)

multiplying chromosomes

b)

growing and copying DNA

c)

destroying DNA

d)

moving inside

26.

How many chromosomes are in each human cell?

a)

1

b)

146

c)

46

d)

1,000,000

27.
The stages of mitosis in order
a)
Metaphase, Anaphase, Prophase, Telophase
b)
Prophase, Anaphase, Metaphase, Telophase
c)
Prophase, Metaphase, Anaphase, Telophase
d)
Anaphase, Prophase, Telophase, Metaphase
28.
Which of the following cells is a gamete?
a)
egg
b)
bone
c)
heart
d)
muscle
29.
The cells produced via meiosis are called:
a)
sex cells
b)
somatic cells
c)
body cells
d)
skin cells
30.
Meiosis makes sperm and egg cells. In humans, sperm and egg cells each have _____ chromosomes. Therefore a fertilized human egg cell (sperm and egg cell combined) would create a cell with _____ chromosomes.
a)
23, 46
b)
46, 23
c)
2, 4
d)
50, 100
31.
Unlike mitosis, meiosis in male mammals results in the formation of
a)
one haploid gamete
b)
three diploid gametes
c)
four diploid gametes
d)
four haploid gametes
32.
If a somatic cell in a butterfly contains 24 chromosomes, a butterfly egg would contain
a)
3
b)
6
c)
12
d)
24
33.
The process of crossing over occurs in what phase of meiosis?
a)
anaphase 1
b)
prophase 1
c)
prophase 2
d)
telophase 1
34.
Crossing over helps promote 
a)
male genotype
b)
genetic variation
c)
DNA replication
d)
mitosis
35.
Chromosomes exchange genetic material during 
a)
crossing over
b)
replication
c)
synthesis
d)
translation
36.
What process, and which type of resulting cells are represented?
a)
mitosis, gametes
b)
mitosis, body cells
c)
meiosis, gametes
d)
meiosis, body cells
37.

At the end of mitosis you have _____ cells.

a)

identical

b)

different

c)

identical twins

d)

variety

38.

The products of meiosis are genetically...

a)

different.

b)

identical.

39.

Identify a purpose of mitosis. Select all that apply.

a)

Produce gametes for reproduction.

b)

Repair damaged or dead cells.

c)

Reduce the chromosome number.

d)

Growth of organisms from birth to adulthood.

40.

What phase is this?

a)

Telophase I

b)

Prophase II

c)

Metaphase I

d)

Anaphase II

41.

What phase is this?

a)

Prophase I

b)

Metaphase II

c)

Anaphase I

d)

Telophase II

42.

What phase is this?

a)

Metaphase I

b)

Prophase II

c)

Telophase I

d)

Anaphase II

43.

What phase is this?

a)

Metaphase II

b)

Prophase I

c)

Telophase I

d)

Anaphase I

44.

What phase is this?

a)

Anaphase II

b)

Telophase I

c)

Telophase II

d)

Anaphase I

45.

What phase is this?

a)

Prophase II

b)

Telophase II

c)

Telophase I

d)

Prophase I

46.

What phase is this?

a)

Telophase I

b)

Metaphase I

c)

Metaphase II

d)

Telophase II

47.

What phase is this?

a)

Prophase I

b)

Metaphase I

c)

Metaphase II

d)

Prophase II

48.

Which genetic disorder is described as having trisomy 21?

a)

Down syndrome

b)

Patau syndrome

c)

Turner syndrome

d)

Klinefelter syndrome

e)

Edwards syndrome

49.

Which genetic disorder is described as having trisomy 18?

a)

Down syndrome

b)

Patau syndrome

c)

Turner syndrome

d)

Klinefelter syndrome

e)

Edwards syndrome

50.

Which genetic disorder is described as missing a sex chromosome?

a)

Down syndrome

b)

Patau syndrome

c)

Turner syndrome

d)

Klinefelter syndrome

e)

Edwards syndrome

51.

Which genetic disorder is described as having trisomy 13?

a)

Down syndrome

b)

Patau syndrome

c)

Turner syndrome

d)

Klinefelter syndrome

e)

Edwards syndrome

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