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Heredity and Genetics Answers

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Which of the following statements BEST describes DNA?

A
DNA are the same as genes.
B
All living things contain DNA.
C
There are three bases that compose DNA.
D
Billions of people in the world have the same genetic code.
2
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When describing Down syndrome, it's important to note that __________.

A
it can be classified as a single-gene disorder
B
it is caused when red blood cells cannot properly form hemoglobin
C
it causes infected males to have low testosterone levels
D
it is usually caused by three copies of chromosome 21
3

Dominant traits include __________.

A
cleft chin and attached earlobes
B
dimples and attached earlobes
C
dimples and no widow's peak
D
cleft chin and free earlobes
4

Gene therapy is a process whereby normal genes are injected to replace abnormal genes. Please select the best answer from the choices provided.

A
T
B
F
5

Genes are segments of a chromosome that are responsible for specific hereditary traits.

A
T
B
F
6

Which of the following are types of hereditary disorders?

A
single-gene and chromosomal
B
complex and duplex
C
single-gene and duplex
D
all of the above
7

Heredity refers to the __________.

A
removal of DNA from the human body
B
formation of chromosomes from DNA
C
many types of female genes
D
passing of traits from parents to children
8

Amniocentesis is a test in which fluid is removed from the uterus so the baby's genetic composition can be determined.

A
T
B
F
9

Sickle cell anemia is most common in people of Northern European descent.

A
T
B
F
10

Chromosomes are composed of DNA.

A
T
B
F
11

Gene testing is foolproof since it scans the building blocks of humans.

A
T
B
F
12

Complex diseases are caused by imperfections in multiple genes.

A
T
B
F
13

Cystic fibrosis is a disease that __________.

A
causes all those infected to live only into their teen years
B
makes it difficult to breathe
C
can be cured with proper medication
D
occurs most frequently in people of Asian descent
14

The normal function of a gene is to __________.

A
encode a protein
B
prevent illness
C
mutate into other cells
D
determine personality
15

Which of the following statements BEST describes chromosomes?

A
Humans have 460 chromosomes in every cell.
B
Chromosomes are arranged in 230 pairs.
C
Chromosomes carry the codes for hereditary traits.
D
Chromosomes are found outside the nucleus of each human cell.
16

Which of the following statements BEST describes chromosomes?

A
Humans have 460 chromosomes in every cell.
B
Chromosomes are arranged in 230 pairs.
C
Chromosomes carry the codes for hereditary traits.
D
Chromosomes are found outside the nucleus of each human cell.
17

Gene therapy is a process whereby normal genes are injected to replace abnormal genes. Please select the best answer from the choices provided.

A
T
B
F
18

Sickle cell anemia is most common in people of Northern European descent.

A
T
B
F
19

Dominant traits include __________.

A
cleft chin and attached earlobes
B
dimples and attached earlobes
C
dimples and no widow's peak
D
cleft chin and free earlobes
20

Amniocentesis is a test in which fluid is removed from the uterus so the baby's genetic composition can be determined.

A
T
B
F

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