4. during mitosis, copied dna is divided evenly into 2 daughter cells. why is it important that this happens correctly? (2 pts)

5. fill in the missing dna (represented by letters). write directly on the picture. (2 pts)

6. how does the dna in the parent cell compare to the daughter cells that are created through cell division? (1 pt)

7. explain how step 7 in the diagram can result in 3 different cell types in step 8 (heart, liver, fat cells). (2 pts)

8. consider the heart cells in the model, build a model / draw a set of pictures showing hierarchy of organs, organ systems, cell, tissue, and organism.

9. would you expect to find nerve cells randomly placed in your body or organized into tissues? explain your answer.

10. the lizard falls and cuts its belly.
a. what will happen to repair the injury? (1 pt)
b. how will the cells in the repaired tissue compare to the cells that were there before? (1 pt)

Question

4. during mitosis, copied dna is divided evenly into 2 daughter cells. why is it important that this happens correctly? (2 pts)

5. fill in the missing dna (represented by letters). write directly on the picture. (2 pts)

6. how does the dna in the parent cell compare to the daughter cells that are created through cell division? (1 pt)

7. explain how step 7 in the diagram can result in 3 different cell types in step 8 (heart, liver, fat cells). (2 pts)

8. consider the heart cells in the model, build a model / draw a set of pictures showing hierarchy of organs, organ systems, cell, tissue, and organism.

9. would you expect to find nerve cells randomly placed in your body or organized into tissues? explain your answer.

10. the lizard falls and cuts its belly.
    a. what will happen to repair the injury? (1 pt)
    b. how will the cells in the repaired tissue compare to the cells that were there before? (1 pt)

Accepted Answer

### Question 4
# Brief Explanations:
Mitosis evenly dividing DNA ensures daughter cells get a complete, identical set of genetic instructions. This is vital for the cells to function properly, maintain the correct genetic information, and support the growth, repair, and normal functioning of the organism. If DNA isn't divided correctly, cells may have abnormal genetic content, leading to dysfunction, developmental issues, or diseases like cancer.
# Answer:
It is important because it ensures each daughter cell receives an identical and complete set of genetic information (DNA) necessary for the cell to function properly, support growth, repair, and maintain the normal structure and function of the organism. Incorrect division can lead to genetic abnormalities, cell dysfunction, or diseases.

### Question 6
# Brief Explanations:
In cell division (mitosis), the DNA in the parent cell is replicated and then divided equally. So the daughter cells have the same amount and identical genetic information (DNA) as the parent cell. This is because mitosis is a process of asexual reproduction or cell replication that preserves the genetic identity of the parent cell in the daughter cells.
# Answer:
The DNA in the daughter cells is identical to the DNA in the parent cell. During cell division (mitosis), the parent cell's DNA is replicated and then evenly distributed to the daughter cells, so they have the same genetic information.

### Question 7
# Brief Explanations:
Step 7 likely represents cell differentiation. During differentiation, cells use different sets of genes (gene expression is regulated) even though they have the same DNA. So cells from step 7 can become specialized (like heart, liver, fat cells) by activating or repressing specific genes, leading to different structures and functions. This process is guided by internal and external signals that determine which genes are expressed, resulting in distinct cell types.
# Answer:
Step 7 is cell differentiation. Cells have the same DNA but different genes are expressed (gene regulation) in response to signals. This causes cells to specialize, developing unique structures/functions to become heart, liver, or fat cells.

### Question 9
# Brief Explanations:
Nerve cells (neurons) are organized into tissues (nervous tissue). In multicellular organisms, cells with similar functions group into tissues to work together efficiently. Nervous tissue consists of neurons and supporting cells, and this organization allows nerve cells to communicate, transmit signals, and perform their function (like sensing, processing, or sending signals) as a coordinated unit. Random placement would prevent effective signal transmission and tissue/organ function.
# Answer:
Nerve cells are organized into tissues (nervous tissue). Multicellular organisms have cells with similar functions group into tissues for efficient function. Nervous tissue (with neurons) allows coordinated signal transmission, which random placement would disrupt.

### Question 10a
# Brief Explanations:
To repair the lizard's belly injury, cells at the injury site will undergo mitosis (cell division) to replace damaged cells. Also, cells may differentiate (if needed) to form the appropriate tissue (like epithelial tissue for the belly lining). The body will initiate a repair process: stop bleeding, clear debris, and then cell division (mitosis) of nearby healthy cells to regenerate the damaged tissue.
# Answer:
To repair the injury, cells at the wound site will undergo mitosis (cell division) to produce new cells. The body will also clear debris, and cells may differentiate to form the appropriate tissue (e.g., epithelial tissue) to close and repair the belly.

### Question 10b
# Brief Explanations:
The cells in the repaired tissue will have the same DNA as the original cells (since mitosis produces daughter cells with identical DNA to the parent cells). They should be functionally and genetically identical (or very similar) to the cells that were there before, as mitosis preserves the genetic information and the repaired tissue needs to match the original tissue's structure and function.
# Answer:
The cells in the repaired tissue will have the same DNA (genetic information) as the original cells. They will be genetically and (ideally) functionally identical to the cells that were there before, as mitosis produces daughter cells identical to the parent cells.

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