Epigenetics and Gene Variation

Gene expression is the ability for a gene to be:

• in the genome.

• transcribed.

• non-coding.

• a dominant allele.

A traumatic event experienced by an organism can affect the health of its children and grandchildren. This can happen through inherited:

• epigenetic tags.

• polypetide chains.

• transcription factors.

• DNA nucleotide patterns.

Tags

NGSS.HS-LS3-2

what does a promoter do?

• it allows a gene to be transcribed
• it creates a DNA segment
• it is another word for ribosomes
• it is another word for RNA

One way to regulate the expression of a gene is to control the formation of mRNA. This is called ___ control.

• transcriptional

• translational

• post-transcriptional

• post-translational

In order for a gene to be expressed, ___ must bind to the gene's ___, a specific sequence of nucleotides at one end of the gene, thus initiating transcription.

• DNA polymerase, promotor

• DNA polymerase, operator

• RNA polymerase, promotor

• RNA polymerase, operator

Genes can be turned on (expressed) when a(n) ____ such as CRP or cAMP receptor protein binds to the CRP binding site.

• repressor

• corepressor

• inducer

• activator

Negative control of gene expression is mediated by __ and results in a(n) __ in the frequency of transcription.

• activators, increase

• activators, decrease

• repressors, increase

• repressors, decrease

The DNA is tightly wrapped around the histone proteins and the gene is methylated.

• The gene is silenced.

• The gene is active.

• It is impossible to tell.

• The gene is on and off at various times.

The protein DNA wraps around to form a nucleosome.

• Gene

• Chromosome

• Nucleus

• Histone

These chemical tags inactivate or silence a gene.

• acetyl groups

• methyl groups

• histones

• genes