
8th Grade Genetics March 14, 2025
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8th Grade

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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the basic unit of DNA called?
gene
nucleotide
chromosome
protein
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the four nitrogenous bases found in DNA?
adenine, uracil, cytosine, guanine
adenine, thymine, cytosine, guanine
adenine, thymine, uracil, guanine
cytosine, thymine, guanine, uracil
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Describe the shape of a DNA molecule.
Single strand
Triple helix
Circular loop
Double helix
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many chromosomes do humans typically have?
48
50
46
44
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the difference between a gene and a chromosome?
A gene is a complete set of chromosomes found in a cell.
A chromosome is a single DNA molecule that does not contain genes.
A gene is a segment of DNA that codes for a protein, while a chromosome is a structure that contains many genes.
A gene is a type of chromosome that contains multiple proteins.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the process by which DNA is copied called?
Replication
Translation
Transcription
Mutation
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a dominant allele?
A dominant allele is an allele that expresses its trait in the presence of another allele.
An allele that only expresses its trait when paired with another dominant allele.
An allele that does not affect the phenotype of an organism.
An allele that is always recessive regardless of other alleles.
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