6D Gene Expression

A scientist shaved an areas of white fur on the back of a Himalayan rabbit and placed an ice pack over the shaved area. The shaved area grew black fur.

Which of these best explains why the hair that grew back (under the ice pack) was black and not white?

• The coat color changed from whit to black with the age of the rabbit.

• White hair only grows during certain times of the year

• The white hair mutated to black hair as the rabbits body temperature decreased

• The genes for black hair were activated by specific temperatures

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NGSS.MS-LS1-5

CRISPR -Cas9 is a genetic modification 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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NGSS.HS-LS1-1

NGSS.HS-LS3-2

At birth Himalayan rabbits are usually white over their entire bodies. But when parts of their bodies reach extremely cold temperatures, a pigment that causes these parts to turn black is produced. Which of the following is most likely the cause of this phenomenon?

• Poor blood circulation

• Gene expression that is regulated by temperatures

• A trait that is both sex-linked and hormone dependent

• Infection caused by cold temperatures

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NGSS.HS-LS3-2

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.

Tags

NGSS.HS-LS4-5

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 sequence

• 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