6D Gene Expression

CRISPR-Cas9 is a genetic modification technique that edits parts of the genome of an organism. Using this technique scientists can add, remove, or modify sections of the DNA sequence. How can scientists use this technique to control gene expression?

• by activating or deactivating specific genes

• by calculating the number of genes different organisms produce

• by identifying how closely related one individual is to another

• by determining the number of chromosomes in an organism

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The Himalayan rabbit's habitat has cold, snowy winters and mild summers. The body is typically covered in white fur except for the nose, feet, tail, and ears, which are covered in black fur. A scientist shaved an area of white fur on the back of a Himalayan rabbit and placed an ice pack over the shaved area. The shaved are grew black fur. Which of these best explains why the hair that grew back where the ice pack was placed was black and not white?

• the genes for black hair were activated by specific temperatures

• the white hair mutated to black hair as the rabbit's body temperature decreased.

• the coat color changed from white to black with the age of the rabbit

• white hair only grows during certain times of the year

The arctic fox inhabits northern areas of North America. The same arctic fox is shown in the drawing at different times of the year. What causes this change in fur color?

• the alleles for fur color change as the arctic fox grows older

• gene expression for fur color is regulated by latitude

• the arctic fox has two traits for fur color that are determined at birth

• gene expression for fur color is regulated by temperature

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Human bone, muscle, and nerve cells all contain the same number of chromosomes with the same complement of genes. What enables these cells to perform specialized activities?

• the ability of some cells to remove unnecessary DNA sequences

• the regulation of gene expression within each cell type

• the mutation of genes within each cell type

• the use of different methods of cell division

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The arctic fox inhabits northern areas of North America. The same arctic fox is shown in the drawing at different times of the year.

What causes this change in fur color?

• The alleles for fur color change as the arctic fox grows older

• Gene expression for fur color is regulated by latitude

• The arctic fox has two traits for fur color that are determined at birth

• Gene expression for fur color is regulated by temperature.

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How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?

• The two different cells become mutated
• The proteins expressed in each cell are different
• They actually have different DNA in the two types of cells.
• The genome of the different cells changes

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_______ is to transcription as ________ is to translation.

• mRNA / Amino Acid Chain
• Amino Acid Chain / mRNA
• Ribosome / Nucleus
• mRNA / tRNA

Gene expression is the ability for a gene to be:

• in the genome.

• transcribed.

• non-coding.

• a dominant allele.

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Monozygotic twins can look different to one another because:

• they have different genetic material from the mother but the same genetic material from the father.

• they have different genetic material from the father but the same genetic material from the mother.

• the environment is determinative of phenotype.

• a mutation has occurred in one twin during embryonic development.

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True or False: All of your body cells contain the same genes.

• True

• False

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