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Genetics Vocabulary

Read the definition and type the term it defines.

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Quiz by
arjaygee
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Last updated: January 22, 2026
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First submittedJanuary 6, 2024
Times taken331
Average score60.0%
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Hint
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Letter
Answer
One of two or more versions of DNA sequence (a single base or a segment of bases) at a given genomic location.
A
Allele
Any chromosome that is not a sex chromosome.
A
Autosome
A person who can pass an inherited (genetic) disease on to their children but who does not have the disease.
C
Carrier
A threadlike structure made of protein and a single molecule of DNA that serves to carry the genomic information from cell to cell.
C
Chromosome
A type of inheritance in which two versions (alleles) of the same gene are expressed separately to yield different traits in an individual.
C
Co-dominance
A condition wherein the dominant allele completely masks the effect of the recessive allele.
C
Complete dominance
A type of mutation in which part of the DNA sequence is lost; the loss can be as small as a single base pair or as much as an entire section of a chromosome.
D
Deletion
A cell having two complete sets of chromosomes; one set is inherited from the mother, and one set from the father.
D
Diploid cell
The common name of deoxyribonucleic acid, the molecule that carries genetic information for the development and functioning of an organism; made of two linked strands that wind around each other to resemble a twisted ladder — a shape known as a double helix.
D
DNA
(of an allele) When the alleles of a gene are different, the allele that is expressed.
D
Dominant allele
The basic physical and functional unit of heredity.
G
Gene
The complete set of genetic information in an organism.
G
Genome
The alleles or variants an individual carries in a particular gene or genetic location.
G
Genotype
Having inherited different versions (alleles) of a genomic marker from each biological parent.
H
Heterozygous
Having inherited the same versions (alleles) of a genomic marker from each biological parent.
H
Homozygous
A form of gene interaction in which both alleles of a gene at a locus are partially expressed.
I
Incomplete dominance
A mutation that causes the premature death of an organism, often in the early stages of embryonic or fetal development, but sometimes after birth.
L
Lethal mutation
A specific, fixed position on a chromosome where a particular gene or genetic marker is located.
L
Locus
Membrane-bound organelles that generate most of the chemical energy needed to power the cell’s biochemical reactions.
M
Mitochondria
An individual's observable traits as determined by their genomic makeup and environmental factors.
P
Phenotype
(of an allele) Having no tangible effect, or that is masked by the effects of a dominant allele.
R
Recessive
The common name of Ribonucleic Acid, a single-stranded organic molecule composed of nucleotides.
R
RNA
A specific characteristic of an individual, determined by genes, environmental factors or by a combination of both.
T
Trait
A gene that resides on the X chromosome.
X
X-linked gene
The single cell formed by the union of gametes (sperm and egg); a fertilized egg.
Z
Zygote
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2 Comments
weaselmarsh6741
+2
Level 50
Jun 8, 2025
A good quiz!

But, for this question ‘When the alleles of a gene are different, the allele that is expressed,’ I only had to type allele for it to count as correct. I’m not sure if this is a mistake or not, but for me it would make more sense to use ‘dominant’ as the type-in.

arjaygee
+1
Level 77
Jun 9, 2025
Definitely a mistake, which has now been fixed. Thanks for pointing it out.
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