Biology quiz #1: Genetics definitions quiz

Type the word that corresponds to each definition.

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Last updated: January 20, 2014

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First submitted	December 3, 2013
Times taken	1,003
Average score	32.3%
Rating	3.38
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Definition	Answer
A length of DNA that codes for one (or more) polypeptides	Gene
The entire DNA sequence of an organism	Genome
The creation of a single stranded mRNA copy of the DNA coding strand	Transcription
A polymer consisting of a chian of amino acid residues joined together by peptide bonds	Polypeptide
A large polypeptide	Protein
A change in the amount of or arrangement of the genetic material in a cell	Mutation
An alternative version of a gene	Allele
Changes to in the nucleotide base sequences in DNA	DNA mutations
Changes to parts of or whole chromosomes	Chromosome mutations
Genes that control the development of the body plan of an organism, including the polarity and positioning of the organs	Homeobox genes
The assembly of polypeptides at ribosomes	Translation
A triplet of nucleotide bases	Codon
A length of DNA next to the structural genes in the lac operon	Operator region
The enzyme produced as a result of the transcription and translation of the Z stuructural gene in the lac operon	β-galactosidase
The enzyme produced as a result of the transcription and translation of the Y stuructural gene in the lac operon	Lactose permease
A length of DNA to which RNA polymerase binds to begin the transcription of the structural genes, Z and Y	Promoter region

Definition	Answer
A protein that can bind to the operator region to stop the structural genes from being transcribed and translated	Repressor protein
A molecule that triggers the production of the two enzymes coded for by the lac operon	Inducer (lactose)
The clusters in which the genes from question 10 are arranged	Hox clusters
Programmed cell death	Apoptosis
A reduction division which produces 4 genetically different cells with the haploid number of chromosomes for the organism	Meiosis
The cells produced as a result of this type of cell division	Gametes
The points at which non-sister chromatids attach	Chiasmata
The swapping of sections of DNA between non-sister chromatids	Crossing over
Unprogrammed, untidy and damaging cell death	Necrosis
A type of allele that is always expressed in the phenotype	Dominant
A type of allele that is only expressed in the phenotype in the presence of another identical allele	Recessive
Alleles that both contribute to the phenotype	Codominant
An organism that has two of the same alleles of a gene	Homozygote
An organism that has two different alleles of the same gene	Heterozygote
The interaction of different gene loci so that one gene locus masks or suppresses the expression of another gene locus	Epistasis

2 Comments

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Level 53

Nov 3, 2015

I don't really get most of the stuff in this quiz, but it seems pretty good. Could you please accept homozygous and heterozygous? An organism that has two of the same alleles of a gene is homozygous, so I think it fits the clue.

Level 28

Dec 30, 2019

Excellent quiz!