Gorillas are usually dark gray or black in color. Occasionally a white gorilla, or albino, is born. This happens because:

a mutation in the gene for fur occurs

DNA does not copy itself during mitosis

too many white fur cells are produced

one of the parents has white fur

A mutation is best described as:

the formation of a DNA sequence

What do harmful mutation do?

increase an individual's immunity to cancer

Scientists have discovered a genetic mutation that enables a plant to better survive drought without losing mass. This is a significant discovery, as this could lessen the amount of water needed for plants to grow and could help plants live and flourish in unfavorable environments, such as during a drought. Stomata, which are small openings on the surface of plants through which carbon dioxide enters and water is released through transpiration, are opened and closed naturally by plants. During a drought, there is less water available for plants. Because of this, a plant might close its stomata during a drought in order to lose less water. However, this also lessens the amount of carbon dioxide that the plant receives, and plants need carbon dioxide in order to make food and grow. There are 20 genes that are known to control stomata. Researchers found that a genetic mutation in the gene GTL1 reduced the number of stomata in a plant. SDD1 is the gene that controls the number of stomata in leaves. In the plant with the mutation in the gene GTL1, the gene SDD1 was strongly expressed, which caused the plant to have fewer stomata. This created a balance between the amount of carbon dioxide the plant could take in and the amount of water it lost during transpiration. With fewer stomata and a decrease in transpiration, mutant plants have increased drought tolerance, as they can store more water during a drought. The mutant plants had the same biomass as a wild plant type, indicating little to no loss in mass or plant yield. The next step for researchers is to figure out how the GTL1 mutation affects crop plants, such as corn and wheat. Question: The mutation in the GTL1 gene is an insertion mutation, which means that one or more base pairs are added to a DNA sequence. A student develops a simplified model of structural changes in genes on chromosomes, using a long piece of string for the chromosome and different-colored beads representing the different base pairs of DNA. The student models the mutation by adding a bead into the sequence for the normal GTL1 gene. How can the student best use the model to explain the mutation?

The model represents a structural change to the gene, resulting in a change in the structure and function of the plant.

The model represents a structural change to the gene, resulting in a change in the structure, but not the function, of the plant.

The model represents a structural change to the gene, resulting in a change in the function, but not the structure, of the plant.

The model represents a structural change to the gene, which has no effect on the structure or function of the plant.

MS-LS3-1 Common Assessment Review

Quiz

•

others

•

7th Grade

•

Practice Problem

•

Easy

Victoria Peterson

Used 12+ times

FREE Resource

21 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A ___________ is part of the DNA code on a chromosome.

trait

gene

cell

model

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT part of a chromosome?

proteins

cell

deoxyribonucleic acid

DNA

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Most mutations occur randomly.

True

False

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Mutations cause changes in ________________.

elements

compounds

essential nutrients

proteins

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Mutations can be

beneficial to an organism

neutral to an organism

harmful to an organism

they can be any of the above

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Most genes contain instructions for making ____________.

proteins

traits

cell

model

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Identify the type of mutation.

Insertion

Substitution

Deletion

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MS-LS3-1 Common Assessment Review

21 questions

A ___________ is part of the DNA code on a chromosome.

Which of the following is NOT part of a chromosome?

Most mutations occur randomly.

Mutations cause changes in ________________.

Mutations can be

Most genes contain instructions for making ____________.

Identify the type of mutation.

Identify the type of mutation.

Identify the type of mutation.

What do beneficial mutation do?

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