practice: haploid v. diploid
answer the following questions about the karyotype below

1. what is a karyotype?
2. how many autosomes are in this human karyotype? how many sex chromosomes?
3. if the last pair reflects whether the organism is male or female, which would this organism be? explain how you know.
4. based on the picture, is this a karyotype of a diploid or haploid cell? explain how you know
5. based on your answer to #4, what type of cells would have this amount of chromosomes in them?
6. is this a picture of chromosomes before or after dna replication during the s phase of interphase? expl how you know.
7. what would a karyotype like this look like after meiosis?

Question

practice: haploid v. diploid
answer the following questions about the karyotype below

1. what is a karyotype?
2. how many autosomes are in this human karyotype? how many sex chromosomes?
3. if the last pair reflects whether the organism is male or female, which would this organism be? explain how you know.
4. based on the picture, is this a karyotype of a diploid or haploid cell? explain how you know
5. based on your answer to #4, what type of cells would have this amount of chromosomes in them?
6. is this a picture of chromosomes before or after dna replication during the s phase of interphase? expl how you know.
7. what would a karyotype like this look like after meiosis?

Accepted Answer

### Question 1
# Brief Explanations:
A karyotype is a visual representation (organized profile) of an individual's chromosomes, arranged in pairs by size, shape, and banding patterns, used to analyze chromosomal structure and number.
# Answer:
A karyotype is an organized profile (picture) of an individual’s chromosomes, arranged in pairs by size, shape, and banding patterns, used to analyze chromosomal structure and number.

### Question 2
# Explanation:
## Step1: Recall human chromosome composition
Humans have 23 pairs of chromosomes (46 total). Autosomes are non - sex chromosomes (22 pairs), and sex chromosomes are 1 pair.
## Step2: Calculate the number
Total chromosomes in a human karyotype: 46. Autosomes: $22\times2 = 44$ (since 22 pairs). Sex chromosomes: 2 (1 pair, either XX or XY).
# Answer:
There are 44 autosomes and 2 sex chromosomes in this human karyotype.

### Question 3
# Brief Explanations:
To determine the sex, we look at the sex chromosomes. In humans, females have two X chromosomes (XX, which are similar in size and shape), and males have one X and one Y chromosome (XY, with Y being smaller and different in shape). If the last pair of chromosomes (sex chromosomes) are similar in size/shape (like two Xs), the organism is female. If they differ (X and Y), it's male. From the karyotype, if the last pair looks like two similar - sized chromosomes (XX), the organism is female.
# Answer:
If the last pair (sex chromosomes) are similar in size/shape (indicating XX), the organism is female. Because in humans, female sex chromosomes are XX (both X chromosomes are similar), while male is XY (Y is different from X).

### Question 4
# Brief Explanations:
A diploid cell has two sets of chromosomes (homologous pairs), while a haploid cell has one set. In a karyotype, diploid cells show chromosomes in pairs (homologous pairs), and haploid cells have single chromosomes. This karyotype shows chromosomes in pairs, so it's a diploid cell.
# Answer:
This is a karyotype of a diploid cell. We know this because diploid cells have two sets of chromosomes (homologous pairs), and the karyotype shows chromosomes arranged in pairs.

### Question 5
# Brief Explanations:
Diploid cells in humans include somatic (body) cells like skin cells, liver cells, muscle cells, etc. These cells have the full set of chromosomes (diploid number, 2n = 46 in humans). Gametes (sperm/egg) are haploid (n = 23). So cells with this (diploid) amount of chromosomes are somatic (body) cells.
# Answer:
Cells with this (diploid) amount of chromosomes are somatic (body) cells (e.g., skin, liver, muscle cells), as these cells are diploid (have two sets of chromosomes) in humans.

### Question 6
# Brief Explanations:
Before DNA replication (in G1 phase), a chromosome has one chromatid. After DNA replication (in S phase), a chromosome has two sister chromatids (attached at the centromere, making the chromosome look "X - shaped"). If the chromosomes in the karyotype have two sister chromatids (look like X - shaped with two chromatids), it's after replication. If they have one chromatid (single - stranded), it's before. From the karyotype, if the chromosomes have two chromatids (X - shaped), it's after DNA replication.
# Answer:
This is a picture of chromosomes after DNA replication during the S phase. We know this because after replication, each chromosome consists of two sister chromatids (the chromosomes in the karyotype appear to have two chromatids, forming an X - like shape), while before replication, chromosomes have only one chromatid.

### Question 7
# Brief Explanations:
Meiosis reduces the chromosome number by half (from diploid to haploid). In meiosis, homologous chromosomes separate, and each resulting cell (gamete) gets one chromosome from each pair. So after meiosis, the karyotype would have half the number of chromosomes (23 in humans), with each chromosome being single (no homologous pairs, and each chromosome has one chromatid). The chromosomes would be unpaired, and the total number would be 23 (one from each original pair).
# Answer:
After meiosis, the karyotype would have half the number of chromosomes (23 in humans), with each chromosome being single (no homologous pairs), and the chromosomes would be unpaired. Each cell (gamete) would have one chromosome from each original pair, so the karyotype would show 23 non - paired chromosomes.

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QUESTION IMAGE

Question

Explanation:

Question 1

Step1: Recall human chromosome composition

Step2: Calculate the number

Answer:

Question 2