The Cell Cycle Worksheet Form - Fill Out and Sign Printable PDF ... - Free Printable

Since I can't view or access images directly, I’ll help you solve the Chromosome & Cell Cycle Unit Review Worksheet based on the text and descriptions you’ve provided. Let’s go through each section step by step.

---

1. Match the following:

| Term | Definition |
|------|----------|
| Chromosome | a. Chromatids (This is incorrect; let's fix it) |

Wait — there seems to be a mismatch in the options. Let's correct this based on standard biology:

Here are the correct matches:

- Chromosome → b. Centromere? No, that’s not right either.

Let’s clarify what the terms mean:

#### Definitions:
- Condensed form of DNA → Chromosome
- Tight coiled strands of DNA and protein → Chromatin
- Together, these make up equal parts of a chromosome → Sister chromatids
- The point at which two chromatids are joined → Centromere

So the correct matching should be:

1. Condensed form of DNA → Chromosome
2. Tight coiled strands of DNA and protein → Chromatin
3. Together, these make up equal parts of a chromosome → Sister chromatids
4. The point at which two chromatids are joined → Centromere

So the correct answers are:

- 1 → a. Chromosome
- 2 → c. Chromatin
- 3 → d. Sister Chromatids
- 4 → b. Centromere

✔ Answer Key for #1:
1. a
2. c
3. d
4. b

---

2. Examine the karyotype to answer the next questions.

We’re given a karyotype with chromosomes labeled from 1–22 and X/Y.

From the image description (assuming typical layout):

- Pairs 1–22 are autosomes.
- The last pair is X and Y, indicating male.

#### a. What is the gender of this person?

→ Since the sex chromosomes are X and Y, the individual is male.

✔ Answer: Male

#### b. How many pairs of chromosomes are there?

→ Humans have 23 pairs of chromosomes: 22 autosomes + 1 sex chromosome pair.

✔ Answer: 23 pairs

#### c. How many chromosomes can be found?

→ Each pair has 2 chromosomes → 23 × 2 = 46 chromosomes

✔ Answer: 46 chromosomes

#### d. Genotype: ___

→ The genotype refers to the genetic makeup. For sex chromosomes, we write XY for males.

✔ Answer: XY

#### e. Sex cells (on this organism):

→ Sex cells (gametes) are haploid and contain half the chromosomes.

→ So gametes will have 23 chromosomes.

✔ Answer: 23 chromosomes

#### f. The gametes:

→ Gametes are sperm cells in males.

→ Sperm cells carry either an X or Y chromosome.

→ So the gametes are haploid and sperm cells.

✔ Answer: Haploid, sperm cells

#### g. Cells made by mitosis?

→ Mitosis produces diploid somatic (body) cells.

→ These cells are identical to the parent cell.

✔ Answer: Diploid, identical

#### h. Cells made by meiosis?

→ Meiosis produces haploid gametes (sperm or egg).

→ These are not identical due to crossing over and independent assortment.

✔ Answer: Haploid, not identical

---

3. Use the pictures below to answer the next set of questions.

We have two karyotypes: A and B

Assume:

- Karyotype A: Shows XX sex chromosomes → Female
- Karyotype B: Shows XY sex chromosomes → Male

Now, answer the questions:

#### a. I could be a diploid cell.

→ Both A and B show full sets of chromosomes (46), so both are diploid.

✔ Answer: A and B

#### b. I could be from a sperm cell.

→ Sperm cells are haploid and have either X or Y.

→ Karyotype B shows XY, but sperm cells would only have X or Y, not both.

→ So neither A nor B represents a sperm cell.

But wait — the question says “I could be from a sperm cell” — meaning could this karyotype represent a sperm cell?

→ Sperm cells are haploid, so they don’t have paired chromosomes.

→ So neither A nor B is a sperm cell.

✔ Answer: Neither

#### c. I could be from an egg cell.

→ Egg cells are haploid, carry only X chromosome.

→ Again, A and B are diploid, so neither is an egg cell.

✔ Answer: Neither

#### d. I could be from an egg cell.

→ Same as above — neither

Wait — perhaps there’s confusion. Let’s rephrase:

If the question is asking: Which karyotype could be from a gamete? Then the answer is neither, since both are diploid.

But if the question is: Which one could be from a female? Then A.

Let’s look again:

> "Does the statement describe karyotype A, B, both A & B, or neither?"

So:

#### a. I could be a diploid cell.

→ Both A and B are diploid (46 chromosomes)

✔ Answer: A and B

#### b. I could be from a sperm cell.

→ Sperm cells are haploid and carry Y or X.

→ But karyotypes A and B are diploid, so cannot be sperm cells.

✔ Answer: Neither

#### c. I could be from an egg cell.

→ Egg cells are haploid, carry X.

→ Again, A and B are diploid → Neither

✔ Answer: Neither

#### d. My chromosomes were made in meiosis.

→ Meiosis produces gametes (haploid).

→ But A and B are diploid, so their chromosomes were made via mitosis, not meiosis.

→ So neither karyotype was formed by meiosis.

✔ Answer: Neither

#### e. I am from a female.

→ Only karyotype A has XX → female

→ B has XY → male

✔ Answer: A

---

✔ Final Answers Summary:

---

1. Matching:

1. Condensed form of DNA → a. Chromosome
2. Tight coiled strands of DNA and protein → c. Chromatin
3. Together, these make up equal parts of a chromosome → d. Sister Chromatids
4. The point at which two chromatids are joined → b. Centromere

---

2. Karyotype Questions:

a. Gender: Male
b. Pairs of chromosomes: 23
c. Number of chromosomes: 46
d. Genotype: XY
e. Sex cells: 23 chromosomes
f. Gametes: Haploid, sperm cells
g. Cells made by mitosis: Diploid, identical
h. Cells made by meiosis: Haploid, not identical

---

3. Karyotype A vs B:

a. I could be a diploid cell → A and B
b. I could be from a sperm cell → Neither
c. I could be from an egg cell → Neither
d. My chromosomes were made in meiosis → Neither
e. I am from a female → A

---

Let me know if you'd like this formatted into a printable answer sheet!