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Unit 3B: Genetics And Heredity
Test Description: Test Review Questions for the Unit 3B Life Science Test
Instructions: Answer all questions to get your test result.
1) A dog has 39 chromosomes. Which of these statements correctly compares the number of chromosomes in a body cell with that in a sex cell of a dog?
A
The body cell has 2n; the sex cell has 1n
B
The body cell has 12; the sex cell has 39
C
The body cell has 1n; the sex cell has 2n
D
The body cell has 39; the sex cell has 3
2) True or false: In anaphase, there is the pinching off or cleaving of the cell into two new cells.
A
False
B
True
3) True or false: In telophase, the chromosomes line up towards the center, or equator of the cell.
A
True
B
False
4) What did Gregor Mendel contribute to Science?
A
Learned that traits can be passed from parents to offspring
B
Discovered that there are different colored pea plants
C
Learned that carrots taste better
D
Learned that people love to eat pink pea plants
5) Which of these characteristics cannot be inherited?
A
Shape of nose
B
Height
C
Temper
D
Color of hair
6) Which of these characteristics can be inherited?
A
Sports ability
B
Singing ability
C
Acting ability
D
Ear shape
7) Which of these is true about how traits can be expressed?
A
Homozygous chromosomes determine genes.
B
Chromosomes on genes determine traits.
C
Alleles from heterozygous (two different alleles) chromosomes determine traits.
D
Alleles on homologous (The chromosome pair is the same) chromosomes determine traits.
8) What is a homologous pair?
A
Two identical alleles
B
Two identical chromosomes
C
Two different chromosomes
D
Two different alleles
9) The green sea turtle is a species of turtles. Which group will the green sea turtle reproduce with?
A
Any reptile
B
Other green sea turtles
C
Any turtle species
10) True or false: Genes are made up of tightly wound DNA. Chromosomes are made up of one or more genes.
A
False
B
True
11) True or false: DNA is a double-helix structure found in the nucleus. Chromosomes straighten the DNA so the code can be read by the genes.
A
True
B
False
12) True or false: Genes are long, tightly wound strands of DNA.
A
True
B
False
13) True or false: Sex cells have one set of chromosomes.
A
True
B
False
14) How many chromosomes are in a sex cell?
A
21 chromosomes
B
2 chromosomes
C
23 chromosomes
D
46 chromosomes
15) How many chromosomes are in a body cell?
A
23 chromosomes
B
21 chromosomes
C
46 chromosomes
D
2 chromosomes
*select an answer for all questions
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